CN205475692U - Fricative steel structure beam and column of shape memory alloy composite wing reason concatenation node - Google Patents

Abstract

The utility model is a steel structure beam-column splicing node with shape-memory alloy composite flange friction. Composed of double nuts and bolts, the column protrudes from the corbel along the direction of the beam, the web of the corbel and the web of the beam are spliced with high-strength bolts, the flange of the corbel and the flange of the beam are spliced, and double nuts are used for splicing Bolt, the shape memory alloy wire is wound between the double nut bolts. The shape memory alloy composite flange friction steel structure beam-column splicing node of the utility model provides energy dissipation capacity by friction damping during small earthquakes, and energy dissipation capacity is provided by friction damping and superelastic damping together during major earthquakes, and the post-earthquake joints It can restore the initial state, and has the advantages of simple structure, strong practicability, clear force, high energy consumption, and self-resetting. This utility model.

Description

A beam-column splicing joint of steel structure with composite flange friction of shape memory alloy

technical field

The utility model belongs to the technical field of construction engineering and relates to a beam-column splicing joint of shape-memory alloy composite flange friction, which is especially suitable for steel frame structures with higher requirements on anti-seismic self-resetting performance.

Background technique

Steel structure has the advantages of light weight, high strength, good seismic performance, and short construction period. It is widely used in various building structures and is one of the most widely used structural forms at present. my country is a country prone to earthquakes, and has high requirements for the seismic performance of building structures, especially the seismic problems of high-rise and super high-rise buildings. Therefore, the research on the seismic performance of steel structure system has very important social and economic significance.

With the in-depth research on the anti-seismic theory and technology of building structures, how to design a structure that does not cause damage during an earthquake or only undergoes rapid repair damage has gradually become one of the important directions for current engineering anti-seismic. This recoverable structural system mainly includes replaceable structural components, rocking structures and self-resetting structures. Public patents such as self-resetting ball-entry winged swinging shock-isolation pier (CN104278620A), self-resetting beam-grid friction wall structure system (CN203583708U), self-resetting shear wall with replaceable connecting beams (CN203626080U) and other public patents An innovative design has been carried out on the recoverable structural system. At the same time, as the most critical component node in the building structure system, it has also become one of the hotspots of innovation and development. Among the published patents, such as: a composite node with angle steel assembled concrete frame with self-resetting function (CN204385908U), An assembled concrete frame composite node with self-resetting function (CN204385909U), a self-resetting frame beam-column node (CN203096950U), etc.

Shape memory alloy (Shape Memory Alloy (SMA) is an important smart material, which has the advantages of good fatigue resistance, strong damping capacity, large recoverable deformation and stable performance. At present, in the field of civil engineering, it has been widely used in dampers in energy dissipation and vibration reduction structural systems. There are also some new designs in terms of self-resetting joints, such as a steel pipe column-H-beam joint using shape memory alloy bolts (CN103216010B), a self-resetting steel connecting beam using shape memory alloy bolts (CN105113641B), a shape memory alloy based Self-resetting steel structure beam-column seismic joint of ring spring group (CN105239674A), etc. In these joints, the shape memory alloys used are mainly in the form of screws, bolts, etc. However, due to the mechanical sensitivity of shape memory alloy bolts, avoiding the fracture of the threaded part at the end is a major problem hindering its safe application; in addition, currently At the same level of shape memory alloy production and processing, the performance of shape memory alloys in the form of rods or rods with larger diameters is worse than that of wires when the cost is the same; at the same time, simply using shape memory alloy materials to dissipate seismic energy will have a negative effect on Shape memory alloy materials put forward high requirements, which will greatly affect the role of shape memory alloys in self-resetting nodes.

Therefore, it will have certain practical significance to develop a high-energy-consuming node that uses a more stable shape memory alloy wire to reset the node.

Utility model content

The purpose of the utility model is to design a high-energy-consuming self-resetting steel structure beam-column node by using a shape-memory alloy wire with more stable performance.

In order to achieve the above-mentioned technical purpose and achieve the above-mentioned technical effect, the utility model is realized through the following technical solutions:

A steel structure beam-column splicing joint with shape memory alloy composite flange friction, the joint includes a column, a corbel and a beam, the column is connected along the direction of the beam and extends out of the corbel, the web of the corbel and the beam The webs are spliced together by web splicing plates and web bolts, and the flanges of the corbel and beams are spliced together by flange splicing plates and double nuts and bolts, and the double nuts and bolts are connected with A shape-memory alloy wire is wound between the flange splice plates, and the double-nut bolts exert proper prestress on the shape-memory alloy wire.

Further, there is a gap at the joint between the corbel and the web of the beam and the flange, and the bolt holes on the flange joint plate and the flange connection part of the beam are oblong holes with a stroke. Cooperate with double nuts and bolts, and the contact surface between the flange splicing plate and the flange of the beam is a friction treatment surface, which is used to provide frictional damping for the relative sliding between the flange of the beam and the flange splicing plate.

Further, the double-nut bolt is composed of an outer nut, an inner nut and a screw rod, and outer nuts are installed at both ends of the screw rod, and an inner nut is provided at the position of the screw rod between the outer nut and the flange splicing plate, and the inner nut is used for Prestress is applied to the shape memory alloy wire, and the outer nut is used to limit the up and down movement of the shape memory alloy wire.

Further, the shape memory alloy wire is wound on the screw rod between the inner nut and the outer nut.

Further, the shape memory alloy wire is NiTi shape memory alloy.

Further, the outer nut is a nut structure.

Further, the column has an I-shaped section or a box-shaped section, and the column and the corbel are connected by welding.

Further, the end of the corbel is haunched to ensure that the plastic mechanism of the beam and column joints occurs at the splicing position of the corbel and the beam, and stiffeners are provided at the corresponding connection between the middle of the column and the flange of the corbel. The concentrated force generated by the transmission of bending moment.

The beneficial effects of the utility model are:

Because the utility model utilizes the shape memory alloy wire as the resetting material, it is more practical than the shape memory alloy bolt and screw rod using the rod; during a small earthquake, the energy consumption capacity is provided by frictional damping; Frictional damping and superelastic damping together provide energy dissipation capacity. When an earthquake occurs, the seismic energy is effectively dissipated and the main structure is protected. Using the superelasticity of the shape memory alloy wire, the nodes can return to the initial state after the earthquake. The shape memory alloy composite flange friction steel structure beam-column splicing node of the utility model has the advantages of strong practicability, clear force, high energy consumption, self-resetting and the like.

Description of drawings

Fig. 1 is a structural representation of the utility model;

Fig. 2 is the top view in Fig. 1 of the utility model;

Fig. 3 is the schematic diagram of B-B sectional structure in Fig. 1 of the utility model;

Fig. 4 is a schematic detailed diagram of the flange splicing section of the present invention.

Explanation of symbols in the figure: 1. Column, 2. Corbel, 3. Beam, 4. Web bolt, 5. Web splicing plate, 6. Shape memory alloy wire, 7. Flange splicing plate, 8. Double nut bolt , 81. Outer nut, 82. Inner nut, 83. Screw rod.

detailed description

The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

Referring to Fig. 1 to Fig. 4, a steel structure beam-column splicing joint with shape memory alloy composite flange friction, the joint includes a column 1, a corbel 2 and a beam 3, and the column 1 is connected and extended along the direction of the beam 3 Out of the corbel 2, the web of the corbel 2 and the web of the beam 3 are spliced together through the web splicing plate 5 and the web bolt 4, and the flange of the corbel 2 and the flange of the beam 3 Spliced together by the flange splicing plate 7 and the double nut bolt 8, the shape memory alloy wire 6 is wound between the double nut bolt 8 and the flange splicing plate 7, and the shape memory alloy wire 6 is wound between the double nut bolt 8 and the shape memory alloy The wire 6 applies a suitable prestress.

There is a gap at the joint between the corbel 2 and the web and the flange of the beam 3, and the bolt hole on the flange splicing plate 7 connected to the flange of the beam 3 is an oblong hole with a stroke. The short dimension is 1-2mm larger than the matching bolt diameter, and the long dimension is determined according to calculation. The bolt hole on the beam 3 is a normal circular hole, and the hole diameter is 1-2mm larger than the matching bolt diameter. The bolts 8 are matched, and the contact surface between the flange splicing plate 7 and the flange of the beam 3 is a friction treatment surface, which is used to provide frictional damping for the relative sliding between the flange of the beam 3 and the flange splicing plate 7 .

The double-nut bolt 8 is composed of an outer nut 81, an inner nut 82 and a screw rod 83. The outer nut 81 is installed at both ends of the screw rod 83, and an inner nut 81 is provided at the position of the screw rod 83 between the outer nut 81 and the flange splicing plate 7. The nut 82, the inner nut 82 is used to apply prestress to the shape memory alloy wire 6, and the outer nut 81 is used to limit the up and down movement of the shape memory alloy wire 6.

The shape memory alloy wire 6 is wound on the screw rod 83 between the inner nut 82 and the outer nut (81).

The shape memory alloy wire 6 is made of NiTi shape memory alloy.

The outer nut 81 is a nut structure.

The column 1 has an I-shaped section or a box section, and the column 1 and the corbel 2 are welded.

The end of the corbel 2 is provided with haunches to ensure that the plastic mechanism of the joint between the beam 3 and the column 1 occurs at the splicing position of the corbel 2 and the beam 3, and the middle part of the column 1 corresponds to the connection between the flange of the corbel 2 Stiffeners are provided to transmit the concentrated force generated by the bending moment.

The implementation steps of the present utility model are described in detail below in conjunction with technical scheme and accompanying drawing:

Step (1) Analyze the structure and calculate parameters such as the diameter and number of bolts required for splicing joints, the thickness of the splicing plate, the size of the oblong hole, the diameter and the number of turns of the shape memory alloy wire;

Step (2) Process the column 1 and its corbel 2 in the factory or on the construction site, and perform positioning and installation according to the normal construction sequence.

Step (3) pre-process the double-screw nut 8, and the two nuts at one end can be pre-processed into a fixed nut; pre-process the beam 3, and open screw holes at its end; pre-process the splicing plate, the wing An oblong hole is provided on the splicing side of the edge splicing plate 7 and the beam 3; friction treatment is performed on the contact surface between the flange of the beam 3 and the flange splicing plate 7.

Step (4) Lift the beam 3 to the installation position, place the web splicing plates 5 on the left and right sides of the webs of the corbel 1 and beam 2, insert the web bolts 4, and then tighten the nuts to complete the web splicing.

Step (5) Place the flange splice plate 7 on the upper and lower sides of the flange of the corbel 1 and the beam 2, and insert the double nut bolt 8, then tighten the inner nut 82 and apply prestress; wind on the screw rod of the double nut bolt 8 Shape memory alloy wire, and prestressing is considered as required

Principle of the utility model

In normal use, the web bolt 4 is connected to bear the shear force of the vertical load transmitted by the beam 3, and the double nut bolt 8 is connected to bear the bending moment at the beam end caused by the vertical load.

When the earthquake load is small, the web bolt 4 still bears the shear force; the upper and lower flanges of the beam 3 slide, and the contact surface with the flange splicing plate 7 provides frictional damping and energy dissipation; the shape memory alloy wire 6 is in the state of austenite , no phase change occurs, bear the bending moment at the beam end, and provide stiffness; when the earthquake is over, use the shape memory alloy wire 6 to reset the node.

When the earthquake load is large, the web bolt 4 bears the shear force; the upper and lower flanges of the beam slide, and the contact surface with the flange splicing plate 7 provides frictional damping energy dissipation; the sliding of the flange drives the double nut bolt 8 to slide, thereby The stretched shape memory alloy wire 6 undergoes martensitic phase transformation, which produces internal friction during phase transformation, provides superelastic damping, and the nodes form a plastic hinge mechanism; when the earthquake ends, the nodes are reset using the superelasticity of the shape memory alloy wire 6 .

During this process, the web bolts 4 always bear the shear force, the contact surface between the flange splicing plate 7 and the beam flange provides frictional damping, and the shape memory alloy wire 6 provides superelastic damping when the earthquake load is large. At the same time, the shape memory alloy wire 6 Provide node reset capability.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (8)

1. A steel structure beam-column splicing joint of shape memory alloy composite flange friction, this joint comprises column (1), corbel (2) and beam (3), it is characterized in that, described column (1) along beam (3) connect and extend the corbel (2), the web of the corbel (2) and the web of the beam (3) are spliced by the web splicing plate (5) and the web bolt (4) Together, the flange of the corbel (2) and the flange of the beam (3) are spliced together through the flange splicing plate (7) and double nut bolts (8), and the double nut bolts (8) A shape-memory alloy wire (6) is wound between the flange splice plate (7), and the double-nut bolt (8) exerts proper prestress on the shape-memory alloy wire (6). 2. the steel structure beam-column splicing joint of shape memory alloy composite flange friction according to claim 1, is characterized in that, the splicing between the web of described corbel (2) and beam (3) and flange There is a gap at the place, and the bolt hole on the flange joint plate (7) and the flange connection part of the beam (3) is an oblong hole with a stroke, which is used to cooperate with the double nut bolt (8), and the The contact surface between the flange splicing plate (7) and the flange of the beam (3) is a friction treatment surface, which is used to provide frictional damping when the flange of the beam (3) and the flange splicing plate (7) slide relative to each other. 3. The steel structure beam-column splicing node of shape memory alloy composite flange friction according to claim 2, characterized in that, the double-nut bolt (8) consists of an outer nut (81), an inner nut (82) and a screw rod (83), an outer nut (81) is installed at both ends of the screw (83), and an inner nut (82) is provided at the position of the screw (83) between the outer nut (81) and the flange splicing plate (7). , the inner nut (82) is used to apply prestress to the shape memory alloy wire (6), and the outer nut (81) is used to limit the up and down movement of the shape memory alloy wire (6). 4. The steel structure beam-column splicing node of shape memory alloy composite flange friction according to claim 3, characterized in that, the shape memory alloy wire (6) is wound and arranged on the inner nut (82) and the outer nut (81 ) between the screw (83). 5. The steel structure beam-column splicing node of shape memory alloy composite flange friction according to claim 4, characterized in that, the shape memory alloy wire (6) adopts NiTi shape memory alloy. 6. The steel structure beam-column splicing node of shape memory alloy composite flange friction according to claim 3 or 4, characterized in that the outer nut (81) is a nut structure. 7. The steel structure beam-column splicing joint of shape memory alloy composite flange friction according to claim 1, characterized in that, the column (1) is an I-shaped section or a box-shaped section, and the column (1) It is welded connection with the corbel (2). 8. The steel structure beam-column splicing joint of shape memory alloy composite flange friction according to claim 7, characterized in that, the end of the corbel (2) is provided with haunches to ensure that the beam (3) and column (1) The plastic mechanism of the joint occurs at the splicing position of the corbel (2) and the beam (3), and stiffeners are provided at the corresponding connection between the middle of the column (1) and the flange of the corbel (2) for transmission The concentrated force produced by the bending moment.