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Non-damage SMA self-resetting steel frame joint

A self-resetting, non-damaged technology, applied in building components, building types, earthquake-proof, etc., can solve the problems of complex construction, loss and relaxation of prestressed stress, and difficulty in controlling the tension of prestressed tendons, so as to reduce losses, Good ductility and safe effect

Inactive Publication Date: 2020-08-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in this kind of joint, such as: the tension degree of prestressed tendons is not easy to control, the stress loss and relaxation of prestressed stress, and the construction is more complicated, etc.

Method used

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  • Non-damage SMA self-resetting steel frame joint
  • Non-damage SMA self-resetting steel frame joint
  • Non-damage SMA self-resetting steel frame joint

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] Such as Figure 1-2 As shown, a non-damage SMA self-resetting steel frame joint, the realization of the joint is as follows: steel beams, steel columns, stiffeners on beam-column webs, bolt holes on the upper and lower flanges of steel beams, angle steel, stiffeners on angle steel Ribs and bolt holes, shear plates, bolt holes and slotted holes in shear plates, connecting plates, lug plates, buckling restraint sleeve plates, working sections of SMA mandrels and external threads at both ends are all prefabricated in the factory. Then transport to the construction site. Firstly, the shear plate (3), upper and lower ear plates (8) on both sides are welded to the column flange. Afterwards, high-strength bolts are used to connect the steel beam (2) and the steel column (1) together through the shear plate (3), and the initial and final tightening o...

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Abstract

The invention discloses a non-damage SMA self-resetting steel frame joint. The joint mainly comprises a steel column, a steel beam, a shear plate, a steel angle and an SMA buckling restrained damper.Compared with a joint adopted in a traditional steel structure, the rotating capacity of the joint depends on the deformability of an SMA core rod instead of the deformability of rolled steel. However, compared with the rolled steel, the SMA has the better deformability, and therefore the joint has the better ductility. Self-resetting of the joint is achieved by means of the superelasticity of theSMA material. When an earthquake happens and the joint rotates, the bending moment generated by earthquake loads are jointly borne by the shear plate and the SMA buckling restrained damper. The phenomenon that the bending moment generated by earthquake loads is borne by the beam column is avoided, and important components are not damaged. Compared with a traditional joint, losses caused by earthquakes are reduced.

Description

technical field [0001] The invention relates to a non-damage SMA self-resetting steel frame node, which belongs to the technical field of steel structures of civil engineering. Background technique [0002] In the Northridge Earthquake in the United States and the Hanshin Earthquake in Japan, the seismic damage of steel frame structures has attracted the attention of scholars. Even if the damaged structure does not collapse, excessive residual deformation will make it impossible to repair, and it can only be demolished and rebuilt, resulting in huge economic losses. Self-resetting structures have drawn more and more attention from the field of earthquake engineering. A self-resetting structure refers to a structure that exhibits nonlinear behavior to dissipate energy under an earthquake, and can spontaneously and completely return to its original position after an earthquake without relying on external forces. Compared with the traditional structure, the most remarkable fe...

Claims

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Application Information

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IPC IPC(8): E04H9/02E04B1/98
CPCE04H9/021E04H9/024E04B1/98
Inventor 邱灿星刘家旺杜修力
Owner BEIJING UNIV OF TECH
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