CN106644324A - Test device for light steel frame beam column node bearing test - Google Patents

Abstract

The invention discloses a test device for testing the mechanical performance of beam-column joints of light steel frames. Fastening bolts for light steel frame columns, upper cover plate for fixing light steel frame columns, bottom plate slots for changing the position of loading points, side plates connecting bottom plate and top plate, splints for beam end loading, hinge rods for loading ends , Beam-column connection joint specimens, mechanical universal testing machine. The entire test device can not only effectively realize the constraint conditions of the beam-column joint mechanical performance test; it can also use tools such as strain gauges, dial gauges, displacement sensors, and force sensors to measure the beam-column joint specimens under load while loading. In order to analyze and study its mechanical mechanism and mechanical model. The whole set of device has clear structure, convenient use and low cost, and is a new type of test device suitable for small light steel beam-column joint test pieces.

Description

A test device that can be used for the mechanical performance test of light steel frame beam-column joints

technical field

The invention relates to a test device which can be used for the force performance test of beam-column joints of light steel frames, and belongs to the technical field of construction engineering.

Background technique

In recent years, with people's increasing emphasis on environmental protection and energy saving, housing industrialization and the substantial increase in my country's steel production, the prefabricated light steel structure with low pollution, short construction period, and good thermal insulation and energy saving effects has attracted great attention from the government and research institutions. More and more scholars have carried out in-depth research on this structure. There have been many researches on the component level based on light steel beams and light steel columns, but from the component level research to the structural level research, the mechanical performance of the beam-column connection joints is the most critical link. The beam-column joint connects various components in the structural system, and plays the role of transferring load and distributing load. Therefore, the mechanical performance of the beam-column joint determines the mechanical performance of the entire structure to a certain extent, and has great influence on the beam-column joint. Research is also the key to the study of light steel frame structures. Traditional steel structure beam-column joint mechanical performance tests often need to be carried out in large-span structural experiment halls, which require reaction walls, ground anchor screws, large jacks, large-tonnage actuators, and cranes required for hoisting test pieces and other items. Hanging, the test cost is higher and the cycle is longer.

Compared with the specimens of beam-column joints of high-rise and long-span steel structures, beam-column joints of light steel frames have the characteristics of small component cross-section, small load, and small displacement. It is difficult to completely match the devices such as jacks and jacks, and the distance between the anchor holes and the reaction wall is relatively large. For the test of small-sized specimens, all the devices for fixing the specimens need to be re-customized. The invention provides a test device and a method that can be used for the test of the mechanical performance of the beam-column joint of the light steel frame, so as to solve the problems of excessive size of the traditional test device, high test cost and high site requirements.

Contents of the invention

The purpose of the present invention is to provide a test device and method that can be used for the test of the mechanical performance of the beam-column joint of the light steel frame, so as to solve the problems of the traditional joint test device occupying a large space, high cost, and inconvenient replacement.

To achieve the above object, the present invention adopts the following technical solutions:

A set of test devices that can be used for the mechanical performance test of beam-column joints of light steel frames, the device includes the bottom plate of the device (1), the lower clamping groove (2), the upper clamping groove (3), the fastening bolts (4), the upper cover Plate (5), bottom plate slot (6), side plate (7), plywood (8), hinge rod (9), beam-column connection joint test piece (10), mechanical universal testing machine (11).

The beam-column joint test piece (10) is a T-shaped test piece, the upper and lower ends of the test piece respectively have a column structure, and the horizontal direction is a beam structure.

The mechanical universal testing machine (11) is connected to the bottom plate (1) of the device by bolts, the side plates (7) are vertically welded on both sides of the bottom plate (1) of the device, and the upper and lower ends of the beam-column joint test piece (10) are respectively passed through The upper cover plate (5) and the device base plate (1) are fixed, the lower card slot (2) is arranged on the device base plate (1), the upper card slot (3) is arranged on the upper cover plate (5), and the lower card slot (2) ) corresponds to the position of the upper clamping slot (3); the upper and lower ends of the beam-column joint specimen (10) are put into the upper clamping slot (3) and the lower clamping slot (2) respectively, and the beam-column joint specimen (10) is fastened with the lower card slot (2) and the upper card slot (3) by fastening bolts (4); the bottom plate long slot (6) is arranged on the device bottom plate (1) for changing the position of the loading point.

The splint (8) is arranged at the beam end loading place of the beam-column joint specimen (10), and the mechanical universal testing machine (11) is connected to the splint (8) through the hinge rod (9).

The device bottom plate (1) assembled and fixed with the universal testing machine is arranged at the bottom of the testing device, and is a key component for connecting the whole testing device with the mechanical universal testing machine (11). The bottom plate of the device (1) is made of Q235 steel or Q345 steel, with a thickness of 25 mm to 35 mm, and is fixed on the loading bottom plate of the universal testing machine (11) by 5 to 6 bolts with a diameter of 24 mm to 30 mm. It is 35mm-40mm thick, has relatively high rigidity, and can withstand relatively large vertical loads. The bottom plate of the device connected thereon provides reliable support for the side plate (7) and the beam-column joint specimen (10).

The shape of the lower clamping groove (2) for assembling the light steel frame column is the same as the column section at the lower end of the beam-column joint specimen (10). In order to facilitate the installation and fixation of the beam-column joint specimen (10), the lower clamping groove (2) The size is greater than the column section size of the lower end, and the lower clamping groove (2) is 1mm more outwards along the four sides. In order to avoid damage to the loading bottom plate of the mechanical universal testing machine (11) during loading, the depth of the lower card slot (2) is about 10mm smaller than that of the device bottom plate (1), and should be 20mm to 25mm. This depth ensures the lower card slot when loading (2) The lower end of the column of the beam-column joint test piece (10) can be firmly embedded. According to the theoretical requirements of the beam-column joint test, after the lower end of the column of the beam-column joint test piece (10) is fixed in the lower clamping groove (2), a theoretically hinged mechanism is to be formed, and the test device is assembled with a light steel frame column. The lower slot (2) fully meets the theoretical requirements of the test.

The shape of the upper clamping groove (3) is the same as that of the upper end of the column of the beam-column joint specimen. The cross-sectional size of the upper end of the column is large, and the four sides of the upper clamping groove (3) are 10 mm to 15 mm outwards. The thickness of the steel plate of the upper clamping groove (3) is the same as the depth of the lower clamping groove (2), ensuring that the upper and lower ends of the beam-column joint specimen are in a hinged state.

There are a total of eight fastening bolts (4) for fixing the light steel frame column, four at the lower slot (2), four at the upper slot (3), and the fastening bolts (4) ensure that the upper and lower slots Key measures for clamping the beam-column joint specimen (10). Due to the machining device, the gap between the beam-column joint specimen (10), the upper clamping groove (3), and the lower clamping groove (2) is unavoidable, and these gaps will cause the beam-column joint specimen (10 ) appears horizontal displacement at the upper and lower column ends, which in turn affects the readings of beam end displacement, which is not allowed in the test. After loading the beam-column joint test piece (10) into the upper slot (3) and the lower slot (2), cover the upper cover plate (5), and bolt it into the fastening bolt (4) of the light steel frame column After tightening, ensure that the upper and lower column ends are in a clamped state when loading, and minimize the experimental error that may be caused by redundant displacement.

The upper cover plate (5) for fixing the light steel frame column is a key component to ensure that the upper end of the beam-column joint specimen is fixed and the axial pressure is applied. Since the size of the upper clamping groove (3) is 10 mm to 15 mm larger than that of the upper end of the column of the beam-column joint specimen (10), as shown in Figure 2, there is a square square at the bottom of the upper cover plate (5). The frame-shaped protrusion just occupies the extra gap of 10mm to 15mm. Cover the upper cover plate (5) and connect and fix the upper cover plate with the upper card slot (3) with four bolts, and then use four bolts to When the fastening bolts (4) are tightened, the upper end of the beam-column joint test piece is completely limited in horizontal displacement, and does not limit bending, which conforms to the mechanical model of the theoretical hinge and meets the requirements of the beam-column joint mechanical performance test. As shown in Figure 2, a small jack or a strong spring (20kN-80kN) can also be installed above the upper cover plate (5) to apply axial pressure to the column end, completely simulating the stress state of the light steel column during work.

The bottom plate long groove (6) for changing the position of the loading point is a key design for changing the loading point during the mechanical performance test of the beam-column connection node. According to the purpose of the test, when the bending performance of the beam-column joint specimen (10) needs to be studied, the loading point needs to be close to the end of the beam; if the shear performance of the joint area needs to be studied, the loading point needs to be moved near the root of the beam-column joint , outside the joint area, since the mechanical universal testing machine (11) cannot move, and the beam-column joint specimen (10) is fixed on the test device, the whole test device can only be moved to change the position of the loading point. The movement is realized by the long slot (6) of the bottom plate used to change the position of the loading point. Loosen the bolts between the bottom plate (1) of the device and the loading bottom plate of the mechanical universal testing machine (11), so that the whole device slides to the designed position. Tighten the bolt again to change the position of the loading point.

The side panels (7) connecting the bottom and top panels play a key role in the integrity of the test setup. The lower part of the side plate is welded to the bottom plate (1) of the device, and the upper part is welded to the top plate where the upper card slot (3) is located. The side plate (7) must have sufficient rigidity to ensure the tightness of the lower card slot (2) and the upper card slot (3). At the same time, the side plate (7) must have sufficient tensile capacity. When the beam end is subjected to a large tensile force, the beam-column joint specimen (10) will transmit this tensile force to the top plate, and the top plate needs to be pulled by the side plate. Ensure that the test is carried out normally. The thickness of the side plate (7) selects a value between 15 mm and 25 mm according to the size of the vertical load. Since the test process needs to connect the displacement sensor, strain sensor, force sensor and other connecting lines, and also needs to observe the test phenomenon in the node area, a triangular hole is opened in the area of the two side plates where the force is not large, as shown in Figure 1 Show.

The function of the splint (8) loaded at the beam end is to fix the beam end and transmit the load of the loading end to the beam end. Therefore, after the beam-column joint specimen (10) is installed in place, the top and bottom of the splint (8) must be fixed with high-strength screws . Since the loading of the beam end is divided into tension and pressure, the splint (8) is also divided into two working conditions: when loading downward, the upper splint directly acts on the top surface of the beam end, and the screw between the lower splints and the lower splint are not stressed. ; When loading upwards, the lower splint bears the action of bending and shearing, and the four screws bear the axial tension. The thickness of clamping plate (8) up and down is at 20～25mm, and four screw rod diameters are at 14mm～20mm.

The hinge rod (9) at the loading end is a key component for transferring the vertical load from the loading beam to the beam end. The hinge rod (9) has two working conditions when loading: when loading downwards, the upper splint (8) is always close to and parallel to the upper surface of the beam end, and the rotation angle of the hinge rod (9) also follows the beam end The increase of the vertical displacement gradually becomes larger; when loading upwards, the hinge rod (9) bears a larger pulling force, so it should always be in a stretched state, that is, there is no corner. The size of the hinge bar (9) should be able to ensure that the net area of the hinge bar and the axis in the middle can withstand the maximum tensile force that the loading crossbeam can exert and ensure that no obvious deformation occurs.

The beam-column connection joint specimen (10) is designed according to the purpose of the test. The light steel column adopts a square section, and the light steel beam can adopt a square section, a rectangular section, or an I-shaped section. If an I-shaped section is used, in order to keep the specimen stable during loading, it is necessary to place The web height sets the rectangular stiffener.

The mechanical universal testing machine (11) is the loading device, measurement and operation tool of the test. The mechanical universal testing machine used in this device is a double-screw series, which is composed of a measuring system, a driving system, a control system and a computer. It has the advantages of high precision, wide speed range, compact structure, convenient operation and stable performance.

The present invention relates to a kind of test device and method that can be used for the mechanical performance test of light steel frame beam-column joint, and its specific method is as follows (as shown in Figure 1):

Step 1: Cut out two bottom plates, two side plates, one top plate, and one back plate according to the design size. The precision requirement is controlled at ±0.5mm. After cutting, the square groove of the top plate is processed on the lathe; milling out Square slots and five long slots on the base plate; triangular slots cut out on the two side plates.

Step 2: Weld the above-mentioned steel plates according to the relative position of the design, the two bottom plates are at the bottom, the two side plates are in the middle, the top plate is at the top, and the back plate is between the bottom plate, top plate, and side plates, with stiffeners effect. When welding, it is necessary to ensure that the quality of the weld is not lower than Class B, and the width and length of each weld must meet the requirements of the current "Code for Design of Steel Structures". Small stiffeners shall be added to the top plate and side plate, bottom plate and side plate, with a thickness of 10mm, and the height and length shall not exceed 50mm.

Step 3: First, according to the design plan, install and fix the device on the loading floor of the mechanical universal testing machine with 24-30mm bolts, and adjust the front and rear positions. Then a force sensor, a connecting vertical shaft, a hinge rod, and an upper splint are installed on the loading beam of the mechanical universal testing machine.

Step 4: Install the beam-column connection node specimen. When installing, tilt the specimen first, pass the upper end of the column of the specimen from the upper slot from bottom to top, and then lift the specimen upward until the lower end of the specimen falls to the bottom of the column. Insert it into the lower card slot on the bottom plate, then tighten the eight fastening bolts in the upper and lower card slots, align the upper cover plate with the upper card slot, cover the upper cover plate, set up the equipment for applying axial pressure, and use the bolts to fasten the upper cover plate The plate is fixed to the top plate.

Step 5: Connect various lines of strain sensor, displacement sensor and force sensor. Clamp the beam-column joint specimens with the upper and lower splints. Debug various sensors, start loading and data acquisition.

Compared with the prior art, the test device of the present invention, which can be used for the stress performance test of the beam-column joint of the light steel frame, has the following advantages:

(1) Low cost: the present invention includes a novel beam-column joint force performance test device, which is made of 15-35mm thick steel plates through processes such as cutting, milling, welding, and painting. The cost of a set of devices is less than 1500 yuan (no Including mechanical universal testing machine). However, the mechanical performance of traditional beam-column joints depends on large-scale laboratory equipment such as reaction walls, ground anchor holes, ground anchor bolts, lateral limit devices, horizontal actuators, and cranes, and the cost is more than 5,000 yuan.

(2) The hardware requirements are not high, and it is easy to promote: At present, there are many types of steel structure beam-column joints used in engineering, many of which lack systematic mechanical performance research, while the traditional beam-column joint mechanical performance test requires a crane. Large-scale test equipment such as structural test halls and reaction walls are difficult for many universities and research institutions. However, the test device of the present invention can be tested on a mechanical universal testing machine, belongs to small-scale test equipment, and is easier to popularize.

(3) Simple loading and accurate data collection: the loading is controlled by the computer of the mechanical universal testing machine. The loading speed has many gears and can be precisely controlled. The data collection equipment can use dial indicators, pull-wire displacement sensors, ordinary displacement sensors, fine data Acquisition system, etc., the drawn load-displacement curve is relatively fine, and the test effect is good. However, the traditional large-scale beam-column joint test equipment is controlled by an oil pump. Due to the large load, the accuracy is relatively poor and the frequency of data collection is low.

(4) Easy to operate:

Compared with the traditional beam-column joint stress test, the test device is small in size, and the workload in the links of installation, disassembly, wiring, collection, and arrangement of measuring tools is reduced, which speeds up the time for parts replacement and improves It not only improves the working efficiency, but also realizes the functions of data collection, adding axial pressure on the column end, and drawing the load-displacement curve that can be realized in the traditional beam-column joint mechanical performance test. It is a new type of high-efficiency test device worthy of promotion.

Description of drawings

Fig. 1 is a kind of three-dimensional schematic diagram of the test device that can be used for the mechanical performance test of light steel frame beam-column joint;

Fig. 2 is a three-dimensional schematic diagram of a multifunctional cover plate that can apply axial pressure on the column top;

Fig. 3 is the working schematic diagram one of loading after the test device of the present invention is installed on the mechanical universal testing machine

Fig. 4 is the working schematic diagram II of loading after the testing device of the present invention is installed on the mechanical universal testing machine.

In the figure: 1. The bottom plate of the device assembled and fixed with the universal testing machine, 2. The lower slot for assembling the light steel frame column, 3. The upper slot, 4. The fastening bolts for fixing the light steel frame column, 5. The upper cover plate of the frame column, 6. The long groove of the bottom plate for changing the position of the loading point, 7. The side plate connecting the bottom plate and the top plate, 8. The splint for loading at the beam end, 9. The hinge rod at the loading end, 10. The beam Column joint joint specimens, 11. Mechanical universal testing machine.

detailed description

The present invention will be further described below in conjunction with specific embodiments.

As shown in Figure 1, a kind of test device that can be used for the mechanical performance test of the beam-column joint of light steel frame, this device comprises the device bottom plate (1) that is assembled and fixed with the universal testing machine, the lower clamping groove (1) that assembles light steel frame column ( 2), the upper clamping slot (3), the fastening bolt (4) for fixing the light steel frame column, the upper cover plate (5) for fixing the light steel frame column, the long groove of the bottom plate for changing the position of the loading point (6), The side plate (7) connecting the bottom plate and the top plate, the splint (8) loaded at the beam end, the hinge rod (9) loaded at the end, the beam-column connection node specimen (10), and the mechanical universal testing machine (11). The test device is made of 15-35mm thick steel plate after cutting, milling, welding, painting and other processes. Q235 or Q345 steel plate can be used, and the processing accuracy of each part should be kept within ±0.5mm. The bottom plate of the device and the loading bottom plate of the mechanical universal testing machine should be able to bear the vertical pressure of not less than 100kN without obvious deformation, and the side plates should be able to bear the vertical tension of not less than 100kN without obvious deformation. The welds between the side plate and the bottom plate, and between the side plate and the top plate shall be able to withstand a tensile force of not less than 100kN without obvious tensile deformation. The top plate of the device should be able to bear the upward load of not less than 100kN on the beam-column joint specimen without obvious bending deformation. According to the estimation of the steel density of 7800kg/ ^m3 , the weight of the whole device is within 200kg. Since the steel materials of the bottom plate, side plate and roof plate all have relatively large thickness (20-35 mm) and relatively high rigidity, while the steel materials of the beam-column members of the light steel frame are generally only 4-8 mm thick, so the whole experimental device can be relatively stable. Effectively restrict the vertical displacement of the beam-column joint specimen, and the upper and lower clamping grooves and the horizontal fastening bolts on the clamping groove can better restrain the horizontal displacement of the beam-column joint specimen, and the whole constraint conforms to the beam-column joint mechanical performance test The required mechanical conditions such as "up and down limitation of horizontal and vertical displacement, hinge joint, unlimited bending, and axial compression"; and the load imposed on the end of the beam by the up and down reciprocating motion of the loading beam of the universal mechanical testing machine can meet the requirements of the beam and column. The loading system of "low-cycle repeated test loading" required for the test of the mechanical performance of the joint; after the specimen is installed in place, a force sensor can be installed on the upper end of the hinge rod at the loading end to measure the force applied to the beam end of the beam-column joint specimen in real time. For the value and change of the vertical force, strain gauges, dial gauges, displacement sensors and other tools can be arranged on the specimen to measure the deformation of the beam-column joint specimen under load, so as to obtain the mechanical performance of the beam-column joint specimen The actual parameters of the beam-column joints are analyzed and studied, and their stress mechanism and mechanical model are studied to provide a basis for the design and application of the beam-column joint type.

The above is a typical embodiment of the present invention, and the practice of the present invention is not limited thereto.

Claims (10)

1. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior, it is characterised in that：The device includes dress Bottom set plate (1), lower bayonet slot (2), upper draw-in groove (3), fastening bolt (4), upper cover plate (5), base plate elongated slot (6), side plate (7), clamping plate (8), toggle (9), beam-column connection test specimen (10), mechanics universal testing machine (11)；

Beam-column connection test specimen (10) is T-shaped test specimen, and the upper and lower ends of test specimen are respectively the structure of post, and horizontal direction is beam Structure；

Mechanics universal testing machine (11) is bolted with device base plate (1), and side plate (7) is vertically welded on device base plate (1) Both sides, the upper and lower ends of beam-column connection test specimen (10) are fixed by upper cover plate (5), device base plate (1) respectively, lower bayonet slot (2) it is arranged on device base plate (1), upper draw-in groove (3) is arranged on upper cover plate (5), the position of lower bayonet slot (2) and upper draw-in groove (3) It is corresponding；The upper and lower ends of beam-column connection test specimen (10) are respectively charged into draw-in groove (3), lower bayonet slot (2), beam-to-column joint section Point test specimen (10) is fastened with lower bayonet slot (2), upper draw-in groove (3) by fastening bolt (4)；Base plate elongated slot (6) is arranged on device base plate (1) on, for changing loading Position；

Clamping plate (8) is arranged at beam-column connection test specimen (10) beam-ends loading, and mechanics universal testing machine (11) is by toggle (9) It is connected with clamping plate (8).

2. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be：Assemble the bottom that fixed device base plate (1) is arranged on experimental rig with universal testing machine, be whole experimental rig with The critical component of mechanics universal testing machine (11) connection；Device base plate (1) is made by Q235 steel or Q345 steel, thickness be 25mm～ 35mm, by 5～6 a diameter of 24mm～30mm be bolted to universal testing machine (11) plus on load floor, mechanical test Machine plus load floor thickness 35mm～40mm, with larger rigidity, larger vertical load can be born, the device being connected thereto Base plate is that side plate (7) and bean column node test specimen (10) provide reliable supporting.

3. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be：Lower bayonet slot (2) shape of assembling light steel frame post is identical with the column section of the lower end of bean column node test specimen (10), in order to The installation for being easy to bean column node test specimen (10) is fixed, and the size of lower bayonet slot (2) is more than the column cross-section size of lower end, lower bayonet slot (2) 1mm is outwards respectively had more along four sides；The little 10mm of depth ratio device base plate (1) of lower bayonet slot (2).

4. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be：Upper draw-in groove (3) shape is identical with end section on the post of bean column node test specimen, for the ease of bean column node test specimen (10) from Inclined downward pierces into draw-in groove (3), and the size of upper draw-in groove (3) is bigger than post upper end sectional dimension, and four sides of upper draw-in groove (3) are outwards each Have more 10mm～15mm；The steel plate thickness of upper draw-in groove (3) is identical with the depth of lower bayonet slot (2), it is ensured that bean column node test specimen it is upper End, lower end are all in being hinged state.

5. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be：The fastening bolt (4) one of fixed light steel frame post has eight, and lower bayonet slot (2) place has four, and upper draw-in groove (3) place has Four, fastening bolt (4) is to ensure that the key measure of lower bayonet slot clamping bean column node test specimen (10)；Due to machinery processing apparatus When, the gap between bean column node test specimen (10), upper draw-in groove (3), lower bayonet slot (2) is difficult to avoid that, and these gaps are in loading There is horizontal displacement in the styletable up and down that bean column node test specimen (10) can be caused, and the reading of beam end displacement is had influence on then；Beam After Column border node test specimen (10) is fitted into draw-in groove (3), lower bayonet slot (2), upper cover plate (5) is covered, bolt enters the fastening of light steel frame post Bolt is tightened after (4), it is ensured that in loading, state of the upper and lower styletable in clamping.

6. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be：The upper cover plate (5) of fixed light steel frame post is to ensure that the key of axle pressure is fixed and applied in bean column node test specimen upper end Part；Because the size of upper draw-in groove (3) has more 10mm～15mm than the post upper end of bean column node test specimen (10) per side, in upper cover plate (5), there is a square square frame shape projection bottom, the gap of this 10mm～15mm having more just is occupied, in upper cover plate (5) Cover, and upper cover plate is connected with upper draw-in groove (3) with four bolts after, then tightened with four fastening bolts (4), allow for The upper end of bean column node test specimen is limited completely horizontal displacement, and not limit flexion, meets the mechanical model that theory is hinged, Reach the requirement of bean column node Experiment of Mechanical Behavior；Small-size jack or brute spring can also be installed in upper cover plate (5) top, Apply axle pressure for styletable, the stress that light steel column is operationally waited is simulated completely.

7. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be：Base plate elongated slot (6) for changing loading Position is to change loading when making beam-column connection Experiment of Mechanical Behavior The key Design of point；According to test objective, when needing to study node district flexural property, load(ing) point is needed bean column node test specimen (10) Will be near beam end, during if necessary to research node district ultimate shear capacity, load(ing) point needs to move near bean column node root, section Outside point area, because mechanics universal testing machine (11) cannot be moved, and bean column node test specimen (10) is fixed in test dress Put, whole experimental rig can only be moved to change the position of load(ing) point, this movement will be leaned on for changing load(ing) point position The base plate elongated slot (6) put realizing, the bolt between back-off assembly base plate (1) and mechanics universal testing machine (11) plus load floor, Make whole device slide into design attitude, then tighten bolt, that is, realize the change of loading Position.

8. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be：Connecting bottom board plays the effect of key with the side plate (7) of top board to the globality of experimental rig；Side plate bottom and device Base plate (1) is welded, and the top board welding that top and upper draw-in groove (3) are located, side plate (7) will have enough rigidity to can guarantee that lower bayonet slot (2) and upper draw-in groove (3) relative position, while side plate (7) will have enough resistance to tensions, when beam-ends is subject to larger pulling force, Bean column node test specimen (10) can pass to top board this pulling force, and top board need side plate haul could guarantee test be normally carried out； The thickness of side plate (7) is according to the size of vertical load from the value between 15mm～25mm.

9. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be：Clamping plate (8) effect of beam-ends loading is to fix beam-ends, and the load of loading termination is passed to beam-ends, therefore in beam column section Point test specimen (10) installs must being fixed with high-strength bolt up and down for rear plate (8) in place；Be divided into when being loaded due to beam-ends pulling force and Pressure, clamping plate (8) is divided into two operating modes：Downwards during loading, train wheel bridge directly acts on beam-ends top surface, the screw rod between lower plate with And lower plate stress is little；When loading upwards, lower plate holds curved scissors effect, and four screw rods bear axial tension；Upper lower plate (8) Thickness in 20～25mm, four screw diameters are in 14mm～20mm；

The toggle (9) of loading termination is the critical component for vertical load being delivered to from loading crossbeam beam-ends；Toggle (9) is in loading When have two operating modes：Downwards during loading, train wheel bridge (8) is close to and parallel all the time with beam-ends upper surface, herein the rotation of toggle (9) Angle slowly becomes big also with the increase of beam-ends vertical displacement；When loading upwards, toggle (9) bears larger pulling force, therefore should This is constantly in exceptionally straight state, i.e., without corner；Being dimensioned to of toggle (9) ensures that the axle of toggle net area and centre can hold By the maximum pull that can apply of loading crossbeam and guarantee not produce obvious deformation；

Beam-column connection test specimen (10) is designed according to test objective；Light steel column adopts square sectional, and light girder steel is using just Square-section or square-section, I-shaped cross-section, if using I-shaped cross-section, to make test specimen keep stable in loading, Need the web height at the node district of I-shaped cross-section, load(ing) point that rectangle ribbed stiffener is set.

10. a kind of experimental rig for light steel frame bean column node Experiment of Mechanical Behavior according to claim 1, it is special Levy and be：The implementation process of the device is as follows,

The first step：Cut out the steel plate of two pieces of base plates, two blocks of side plates, one piece of top board, one piece of backboard, essence according to design size respectively Degree requires that control, in ± 0.5mm, processes the square groove of top board on lathe after cutting；Mill out square groove on base plate and Five elongated slots；Cut out the vee gutter on two side plates；

Second step：Relative position according to design welds aforesaid each block of steel plate, two pieces of base plates under, two blocks of side plates in centre, Upper, backboard has the effect of ribbed stiffener concurrently to top board between base plate, top board and side plate；To guarantee that weldquality is not low during welding In B levels, each weld width and length will meet existing《Code for design of steel structures》Requirement；Top board and side plate, base plate and side plate Small-sized ribbed stiffener, thickness 10mm, high and long size is added to be less than 50mm；

3rd step：First according to design, device is fixed on adding for mechanics universal testing machine with the bolt of 24～30mm On load floor, front and back position is adjusted；Then force snesor, connection are installed on the loading crossbeam of mechanics universal testing machine to erect Axle, toggle, train wheel bridge；

4th step：Install beam-column connection test specimen, test specimen is first inclined during installation, by the post upper end of test specimen from upper draw-in groove under And on pass, then up lifting test specimen, treats the lower bayonet slot that newel post bottom is fallen on base plate under test specimen, then tightens in lower bayonet slot Eight fastening bolts, upper cover plate is alignd with upper draw-in groove, cover upper cover plate, set plus axle pressure equipment, will be upper with bolt Cover plate is fixed on top board；

5th step：Connection strain transducer, displacement transducer, the various lines of force snesor；With train wheel bridge and lower plate by beam column Connecting node test specimen is clamped；Various sensors are debugged, starts loading and data acquisition.