CN105821961B - A kind of tee girder column connected node - Google Patents

Abstract

The invention discloses a T-shaped beam-column connection node, which comprises a multi-cavity steel pipe concrete composite column and side plates arranged symmetrically along the two side walls of the multi-cavity steel pipe concrete composite column; Insert the insert plate of the multi-cavity steel pipe concrete composite column inside it, and insert a reinforced H-shaped steel composite beam into the extension of the two side plates and the insert plate to form a T-shaped beam-column connection node. As the edge constraining member of the entire steel tube concrete column, this node can improve its bearing capacity, energy dissipation capacity and ductility; it is convenient for on-site construction, does not damage the multi-cavity steel tube concrete composite column, and saves materials and labor. The use of steel pipes has a strong restraint effect on the concrete, and the overall structure meets the design principle of "strong columns and weak beams, strong nodes and weak components". The nodes have multiple seismic fortification lines to avoid the damage of the overall system due to the damage of some components, and at the same time It has the necessary strength, good deformation ability and energy dissipation ability.

Description

A T-shaped beam-column joint

technical field

The invention relates to a T-shaped beam-column connection node, which is mainly applied to the steel pipe concrete composite column of multi-storey and high-rise buildings in the building structure.

Background technique

With the economic globalization and the improvement of urbanization level, the urban population density is gradually increasing, which makes a large number of high-rise buildings emerge continuously. There is an urgent need for new technologies to support the design and construction of high-rise and multi-storey buildings.

Concrete filled steel tube utilizes the interaction between the steel tube and concrete in the process of stress, that is, the restraint of the steel tube on the concrete makes the concrete in a complex stress state, so that the strength of the concrete is improved, and the plasticity and toughness are greatly improved. At the same time, after the steel pipe is filled with concrete, the buckling of the steel pipe wall can be avoided or delayed due to the supporting effect of the concrete. The combination of the two materials makes up for their respective shortcomings, making the material performance fully exerted. The structure can improve the bearing capacity, reduce the thickness of the wall, slow down the attenuation speed of the bearing capacity and stiffness, and enhance the ductility of the cylinder or the wall.

With the development of society and the improvement of living standards, people have higher and higher requirements for the usable area and aesthetics of houses. The traditional round or square cross-section concrete-filled steel tube columns are usually not completely surrounded by walls, and a large part of the column feet protrudes from the interior of the room, occupying a certain amount of indoor space, which limits the furniture and room layout to a certain extent. The steel pipe concrete composite column with rectangular cross-section can be as wide as the wall, which solves the problem of protruding edges and corners of the column.

Studies have shown that for the general form of rectangular concrete-filled steel tube composite columns, the constraints of steel tubes on the core concrete are limited to the corner points, weaker at the periphery, and the bearing capacity is relatively low. The multi-cavity concrete-filled steel tube composite column whose end column is a rectangular steel tube is equipped with restraint members at the edge to improve its bearing capacity and energy dissipation capacity. Stiffening and tie measures are arranged laterally to divide the column body into several chambers, so that the restraint effect of the steel plate on the concrete Reinforce, reduce the aspect ratio of the steel plate at the same time, prevent or delay the local buckling of the steel plate.

Contents of the invention

The purpose of the present invention is to provide a T-shaped beam-column connection node with stiffening rib concrete-filled steel pipe composite columns with simple construction and low cost, which can solve the problem of protruding edges and corners in the traditional column chamber, and improve the bearing capacity of multi-cavity concrete-filled steel pipe composite columns. Ductility. Delay or avoid the reduction of component stiffness, bearing capacity and ductility due to local buckling of the steel pipe wall plate, and give full play to the performance of the material. The overall structure satisfies the design principle of "strong columns and weak beams, strong nodes and weak components". The nodes have multiple seismic fortification lines, and have the necessary strength, good deformation capacity and energy dissipation capacity.

In order to achieve the above object, the present invention adopts the following technical solutions:

A T-shaped beam-column connection node, comprising a multi-cavity steel pipe concrete composite column, and side plates arranged symmetrically along the two side walls of the multi-cavity steel pipe concrete composite column; For the inserting plate of the steel tube concrete composite column, a reinforced H-shaped steel composite beam is inserted into the two side plate extensions and the inserting plate to form a T-shaped beam-column connection node.

Further, the reinforced H-shaped steel composite beam includes H-shaped steel, and two stiffeners arranged between the steel flanges at the ends of the H-shaped steel, and a pair of H-shaped steel edges are connected along both sides of the H-shaped steel web inside the stiffened ribs. The connecting parts are flush, and the upper and lower cover plates are respectively welded on the outer sides of the upper and lower flanges of the H-shaped steel.

Further, the connecting piece is an angle steel structure, and bolt holes are distributed on the outer end surface of the angle steel.

Further, the side plate is provided with through holes corresponding to the bolt holes of the connectors.

Further, the width of the upper cover plate and the lower cover plate is greater than the width of the upper and lower flanges of the H-shaped steel.

Furthermore, the stiffeners are fixed on both sides of the web of the H-shaped steel by three-sided welding.

Further, the multi-cavity concrete-filled steel pipe composite column is composed of hidden columns at both ends connected with webs and partitions between the hidden columns, and concrete is poured into it.

Further, the hidden column is a hot-rolled steel pipe.

Further, the two side plates are horizontally fixed along both sides of the multi-cavity steel pipe concrete composite column, and the two inserting plates are attached along both sides of the concealed column at both ends.

The present invention can obtain following beneficial effect:

1) Reinforced H-shaped steel composite beams and multi-cavity concrete-filled steel pipe composite columns form joints, forming a T-shaped connection between beams and multi-cavity steel pipe concrete composite columns, which solves the problem of increasing the usable area and aesthetics of the room.

2) After the reinforced H-shaped steel composite beam is fixed to the multi-cavity concrete-filled steel tube composite column, it can be used as the edge restraint member of the entire steel tube concrete column, which can improve its bearing capacity and energy dissipation capacity.

3) The reinforced H-shaped steel composite beam is prefabricated, and then inserted into the multi-cavity concrete filled steel pipe composite column as a whole, which improves the bearing capacity and ductility of the component. The on-site construction is convenient, and the multi-cavity steel pipe concrete composite column is not damaged, saving materials and labor.

4) Due to the use of multi-cavity steel pipe concrete composite columns, the steel pipes have a strong restraint effect on the concrete, and the overall bearing capacity and ductility of the column body are relatively good, which meets the design requirements of strong columns and weak beams.

5) The overall structure satisfies the design principle of "strong columns and weak beams, strong nodes and weak components". The nodes have multiple anti-seismic fortification lines to avoid the damage of the overall system due to the damage of some components, and also have the necessary strength and good deformation capacity and energy consumption capacity.

Description of drawings

Fig. 1 is a schematic diagram of the T-shaped beam-column connection node structure of the present invention;

Figure 2 (a)-(c) is a schematic structural view of the reinforced H-shaped steel composite beam;

Figure 3 (a)-(h) is a schematic diagram of the joint structure of the reinforced H-shaped steel composite beam and the multi-cavity steel pipe concrete composite column;

Fig. 4 (a)-(c) is the sectional view of T-shaped beam-column connection node of the present invention;

Fig. 5 is (a)-(c) is the schematic diagram of beam yield failure process;

Fig. 6 is a schematic diagram of the hysteresis curve of a node.

In the figure: 1. Multi-cavity steel pipe concrete composite column; 2. Side plate; 3. Reinforced H-shaped steel composite beam; 3-1, H-shaped steel; 3-2, upper cover plate; 3-3, stiffening rib; 3- 4. Lower cover plate; 3-5. Connectors; 4. Plug-in combined support; 4. Plug-in plate; 5. Hot-rolled steel pipe.

Detailed ways

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

As shown in Figure 1, the T-shaped beam-column connection node of the present invention includes a multi-cavity concrete-filled steel tube composite column 1, and side plates 2 symmetrically arranged along the two side walls of the multi-cavity steel tube concrete composite column 1. There is an insert plate 4 that runs through the side plate 2 and is inserted into the multi-cavity steel pipe concrete composite column 1 inside it, and a reinforced H-shaped steel composite beam 3 is inserted on the extension of the two side plates 2 and the insert plate 4 to form a T-shaped beam column Connect the nodes.

As shown in Figure 2 (a)-(c), the reinforced H-shaped steel composite beam 3 of the present invention includes H-shaped steel 3-1, and two stiffeners arranged between the shaped steel flanges at the end of H-shaped steel 3-1 Rib 3-3, the stiffener 3-3 is welded on both sides of the web of the H-shaped steel 3-1, and a pair of edges of the H-shaped steel 3-1 are welded on both sides of the web of the H-shaped steel 3-1 along the inner side of the stiffener 3-3 The flush connectors 3-5 are respectively welded with an upper cover plate 3-2 and a lower cover plate 3-4 on the outer sides of the upper and lower flanges of the H-shaped steel 3-1. Wherein, the connecting piece 3-5 is an angle steel structure, and bolt holes are distributed on the outer end surface of the angle steel. Through holes corresponding to the bolt holes of the connecting parts 3-5 are provided on the side plate 2 and the inserting plate 4 . The width of the upper cover plate 3-2 and the lower cover plate 3-4 is greater than the width of the upper and lower flanges of the H-shaped steel 3-1. Stiffeners 3-3 are fixed on both sides of the web of the H-shaped steel by three-sided welding. The multi-cavity concrete-filled steel pipe composite column 1 is composed of a concealed column composed of hot-rolled steel pipes at both ends, and the web and partition between the concealed columns are connected. Among them, two side plates 2 are placed along the two sides of the multi-cavity steel pipe concrete composite column 1. Fixed horizontally, two inserting boards 4 are fitted along both sides of the concealed columns at both ends.

As shown in Figure 3 (a)-(h), the installation process of the T-shaped beam-column connection node of the present invention is as follows:

(1) Position the inserting plate 4 on the multi-cavity steel pipe of the multi-cavity steel pipe concrete composite column 1;

(2) According to the positioning dimension of the inserting plate 4 in the multi-cavity steel pipe of the multi-cavity steel pipe concrete composite column 1, a vertical groove with the same thickness as the inserting plate 4 is opened on the web plate of the multi-cavity steel pipe, as the inserting plate 4 runs through the multi-cavity The channel of the side plate 2 of the steel tube concrete composite column 1; insert the inner plate, and temporarily fix it by spot welding;

(3) Locate the installation position of the side plate on the multi-cavity steel pipe, and connect and fix the side plate and the multi-cavity steel pipe along the long side direction with fillet welds;

Then plug welding is used to weld the insert plate, side plate and multi-cavity steel pipe together; the outer insert plate 4 is broken into two sections, and the outer section of the outer insert plate 4 is vertically connected along the front side plate by double-sided fillet welds, and the outer The inner section of the plug-in plate 4 is connected and fixed with the hidden column and the side plates on both sides by plug welding;

(4) Insert the pre-assembled reinforced H-shaped steel composite beam 3 between the side plates on both sides, and temporarily fix the reinforced H-shaped steel composite beam 3 with the side plates on both sides by tightening the mounting bolts; then connect the side plates with the upper and lower cover plates and connector welding;

(5) Concrete is poured into the multi-cavity steel pipe to complete the installation of T-shaped beam-column connection nodes.

As shown in Fig. 4(a)-(c), it is a sectional view of the T-shaped beam-column connection node of the present invention.

The T-shaped beam-column connection node of the invention can improve its bearing capacity and energy dissipation capacity. Moreover, the on-site construction is convenient, the multi-cavity steel pipe concrete composite column is not damaged, and the material and labor are saved.

The mechanical properties of the T-shaped beam-column joint of the present invention will be described below by taking the multi-cavity steel pipe concrete composite column-steel beam U-shaped rigid joint as a column.

Using ABAQUS software to conduct finite element analysis on the joints, the joint column is a 200x600 multi-cavity concrete-filled steel pipe composite column, the beam is made of H350x150x6x10 welded I-beam, and the thickness of both side plates and cover plates at the joint is the same as that of the beam flange. The results of finite element analysis are shown in Fig. 5(a)-(c).

Due to the use of multi-cavity steel pipe concrete composite columns, the steel pipes have a strong restraint effect on the concrete, and the overall bearing capacity and ductility of the column body are relatively good, which meets the design requirements of strong columns and weak beams. The failure sequence of multi-cavity CFST composite column-steel beam U-shaped rigid joints is shown in Fig. 5(a)-(c). When the external force is large, plastic hinges first appear at the beam end A far away from the joint connection area, as shown in Figure 5(a), the internal force is redistributed, and the bearing capacity of the structure increases; Figure 5(b) shows plastic hinges in the plate; the final failure of the structure is shown in Figure 5(c), the beam end flange buckles, and the upper and lower sides C of the side plate yield in a large area, but the side plate does not form a plastic hinge, and the structure still has certain The energy dissipation capacity meets the design requirements of strong nodes and weak members.

The present invention is based on the principle of seismic concept design. The structure should have multiple seismic fortification lines to avoid the damage of the whole system due to the damage of some components. At the same time, it also requires the structure to have necessary strength, good deformation capacity and energy dissipation capacity. The T-shaped beam-column connection node of the present invention adopts the multi-cavity steel pipe concrete composite column-steel beam U-shaped rigid connection node form, adopts the isolation method of the column and the beam end, and transmits the beam through the node connector composed of the full-height side plate and the cover plate Bending moment and shear force. When an earthquake occurs, plastic hinges first appear at the end of the beam, which consumes a certain amount of seismic energy to form the first seismic fortification line, and then plastic hinges appear on the cover plate to further dissipate the seismic energy to form the second seismic fortification line, and the side panels finally form Plastic hinges form the third seismic fortification line. The overall structure meets the design principle of "strong columns and weak beams, strong nodes and weak components", and the energy dissipation performance of the structure is relatively good. As shown in Figure 6, the hysteresis curve of the node is full, without obvious pinching phenomenon, the energy dissipation capacity of the node is good, and the deformation is large. When the earthquake comes, the residents have more time to escape.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments. It cannot be determined that the specific embodiments of the present invention are limited thereto. Under the circumstances, some simple inferences or substitutions can also be made, which should all be deemed to belong to the scope of patent protection determined by the submitted claims of the present invention.

Claims (6)

1. a kind of tee girder column connected node, it is characterised in that：It is mixed including multi-cavity steel tube concrete coupled column, and along multi-cavity steel tube The solidifying symmetrically arranged side plate in local soil type's zygostyle two side is equipped with through side plate along one of side plate and is inserted into its inside Multi-cavity steel The plate of pipe concrete coupled column, the multi-cavity steel tube concrete coupled column by between the sleeper and sleeper at both ends web with every Plate connects and composes, and concreting is wherein；Two blocks of side plates are fixed along multi-cavity steel tube concrete coupled column both sides level, two pieces Plate is bonded along both ends sleeper both sides；Inserted with reinforced H profile steel combination beam on two pieces of side plate extended segments and plate, T is constituted Ellbeam column connected node；

The reinforced H profile steel combination beam includes H profile steel, and two pieces be arranged between the section steel flange of H profile steel end are put more energy into Rib, the H profile steel web both sides on the inside of ribbed stiffener are connected with a pair of connector being flush with H profile steel edge, above and below H profile steel It is respectively welded upper cover plate and lower cover on the outside of the edge of a wing.

2. a kind of tee girder column connected node according to claim 1, it is characterised in that：The connector is steel angle structure, Bolt hole is distributed on the outer end face of angle steel.

3. a kind of tee girder column connected node according to claim 1 or 2, it is characterised in that：It is set on the side plate and plate There is through-hole corresponding with connector bolt hole.

4. a kind of tee girder column connected node according to claim 2, it is characterised in that：The upper cover plate and lower cover Width is more than the width of lower flange in H profile steel.

5. a kind of tee girder column connected node according to claim 2, it is characterised in that：The ribbed stiffener uses three skirts Solid welding is scheduled on the web both sides of H profile steel.

6. a kind of tee girder column connected node according to claim 1, it is characterised in that：The sleeper is hot finished steel pipe.