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Fabricated self-resetting beam column joint and construction method thereof

A beam-column joint and self-resetting technology, which is applied in the direction of protective buildings/shelters, building types, buildings, etc., can solve the problems of increasing structural acceleration response, stress relaxation of prestressed tendons, weak energy dissipation characteristics, etc., and achieve improved Self-resetting ability, overall rigidity guarantee, and the effect of improving brittle failure problems

Pending Publication Date: 2020-12-18
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, using PT (Post-tensioned, post-tensioned prestressing) to make the nodes of the structure realize self-resetting needs to strictly control the prestress. Under large prestress, there are nodes and assembly difficulties in tensioning prestressed tendons, and there are also Stress relaxation and "brittle fracture" of prestressed tendons
On the other hand, using the material properties of SMA (Shape Memory Alloy, shape memory alloy) to achieve self-resetting nodes has weak energy dissipation characteristics. Although the residual deformation after the earthquake is negligible, due to its weak energy dissipation characteristics, it may increase Acceleration Response of Structures Under Earthquake

Method used

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  • Fabricated self-resetting beam column joint and construction method thereof
  • Fabricated self-resetting beam column joint and construction method thereof
  • Fabricated self-resetting beam column joint and construction method thereof

Examples

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Effect test

Embodiment 1

[0032] see figure 1 with figure 2 , this embodiment discloses an assembled self-resetting beam-column node, including a column 1 , an I-shaped steel beam 2 , a connector 5 , an SMA cable 10 and an SMA bolt 11 .

[0033] The column 1 is an I-shaped steel column. A stiffener 101 is welded at the web of the column 1 .

[0034] see image 3 with Figure 4 , the connecting member 5 includes a riser 502 and an L-shaped plate arranged on one side of the riser 502 . The long limb of the L-shaped plate is a wedge-shaped plate 501 , and the short limb is an outwardly extending flange 503 . The surface of the wedge plate 501 includes a straight surface and a wedge surface. A wedge angle is formed between the straight surface and the wedge-shaped surface. The additional overhanging flange 503 is a straight plate. Said additional overhanging flange 503 is arranged parallel to the riser 502 . The additional overhanging flange 503 is arranged on one side of the straight surface of ...

Embodiment 2

[0042] This embodiment discloses a construction method for the assembled self-resetting beam-column joint described in Embodiment 1, which includes the following steps:

[0043] 1) Standardized production of columns 1, I-shaped steel beams 2, connectors 5, SMA cables 10 and SMA bolts 11 in the factory. Waist-shaped bolt holes are provided at the ends of the I-shaped steel beam 2 flanges. An additional connecting plate 204 is welded on the lower surface of the upper flange 202 of the I-shaped steel beam 2 and the upper surface of the lower flange 203 .

[0044] 2) Screw the screw rod of SMA bolt 11 through the waist bolt hole of the flange of I-shaped steel beam 2 and the circular bolt hole of corresponding wedge plate 501 and then screw into the steel spacer 13, and connect the I-shaped steel beam 2 and the wedge Part 5 is connected and compressed.

[0045] 3) Use the SMA cable 10 to connect the additional overhanging flange plate 503 with the additional connecting plate 204...

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Abstract

The invention provides a fabricated self-resetting beam column joint and a construction method thereof. The joint is connected with a beam column component through wedge-shaped connecting pieces, beamflanges are provided with corresponding slopes matched with the wedge-shaped connecting pieces, and the beam flanges and the wedge-shaped connecting pieces are combined to form friction pairs. SMA bolts are adopted for connecting and pressing the steel beam flanges and the wedge-shaped connecting pieces, and it is guaranteed that the friction pairs are always kept tightly attached in the slidingprocess. Kidney-shaped bolt holes are formed in the beam flanges to achieve relative sliding between the beam flanges and the wedge-shaped connecting pieces, SMA bolt deformation is increased in the sliding process, so that the self-resetting capacity is excited, meanwhile, friction force between the friction pairs is increased, and the energy dissipation capacity of the joint is improved. On theother hand, SMA cables are adopted to connect additional extending flanges of the wedge-shaped connecting pieces with additional connecting plates on a steel beam, so that multi-assembly energy dissipation and self-resetting capacity of the joint under larger deformation are achieved. Therefore, the joint well realizes the balance between the self-resetting performance and the energy dissipation capacity, and solves the problem that the energy dissipation characteristic and the self-resetting characteristic of existing joints are difficult to combine at the same time.

Description

technical field [0001] The invention relates to the field of structural engineering, in particular to an assembled self-resetting beam-column joint. Background technique [0002] Steel has good ductility, can be recycled, is conducive to energy saving and emission reduction, and meets the requirements of sustainable development. Therefore, steel structure buildings are more and more widely used in industrial buildings and civil buildings. In civil buildings, steel structures are widely used in waiting rooms, large stadiums and various residential buildings; in industrial buildings, steel structures are widely used in various industrial plants, high-voltage transmission towers and towering structures. With my country's steel production ranking among the top in the world and the progress of construction technology, it can be expected that in the next few decades of development, steel structure buildings will become the preferred structural form of more types of buildings. [...

Claims

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Application Information

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IPC IPC(8): E04H9/02E04B1/98E04B1/58
CPCE04B1/98E04H9/021E04H9/024
Inventor 柯珂张还阳郭丽华石宇王艺林
Owner CHONGQING UNIV
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