High energy dissipation self-resetting beam-column joint and methods based on shape memory alloy screws

A memory alloy, high energy consumption technology, applied in building components, shockproof, construction and other directions, can solve the problems of easy loosening of shape memory alloy screws, poor hysteretic energy dissipation capacity, large residual deformation, etc. Good hysteretic energy dissipation capacity and small residual deformation

Active Publication Date: 2016-01-20
TONGJI UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of existing shape memory alloy beam-column joints with small i

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  • High energy dissipation self-resetting beam-column joint and methods based on shape memory alloy screws
  • High energy dissipation self-resetting beam-column joint and methods based on shape memory alloy screws
  • High energy dissipation self-resetting beam-column joint and methods based on shape memory alloy screws

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0032] The present invention proposes a self-recovering beam-column joint with high hysteretic energy dissipation performance. The joint realizes hysteretic energy consumption through the superelasticity of the shape memory alloy screw and the plasticity of the angle steel. Through the superelasticity of the shape memory alloy and the initial The self-recovery of joints is achieved by pre-straining, which overcomes the shortcomings of poor hysteretic energy consumption and large residual deformation after unloading of general shape memory alloy joints. At the same time, the present invention also proposes two unique methods for applying the initial pre-strain of the screw, which solves the problem that the shape-memory alloy screw cannot be pre-strained due to its small torsional stiffness.

[0033] Such as Figure 1 to Figure 3As shown, this ...

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Abstract

A high energy dissipation self-resetting beam-column joint based on shape memory alloy screws comprises a beam end assembly, a column end assembly, an energy-dissipating element, a self-resetting element and a shear-resistant element. The energy-dissipating element is made of a low-strength high-energy-dissipation steel angle, and two limbs of the steel angle are connected with a column flange and a beam flange through high-strength bolts, respectively. The self-resetting element is made of a shape memory alloy screw having super elasticity, one end of the screw is connected with a column, and the other is connected with a beam. The shear-resistant element is made of a double-side shear-resistant plate having an elongated bolt hole. The shape memory alloy screw needs to be applied initial prestress to ensure that the screw is constantly stressed during operating. The invention further provides a method of thermally treating and training the shape memory alloy screw and a method of applying the initial prestress to the shape memory alloy screw. The invention has the advantages that higher initial screw prestress may be applied, initial rigidity is higher, self-resetting capacity is excellent, and hysteretic energy capacity is better.

Description

technical field [0001] The invention belongs to the technical field of construction engineering and relates to an anti-seismic beam-column node, in particular to an intelligent beam-column node capable of consuming energy during an earthquake and self-resetting after an earthquake. Background technique [0002] Shape memory alloy (SMA), as a new type of intelligent metal material, not only has unique shape memory effect and superelasticity, but also has excellent fatigue resistance, wear resistance, corrosion resistance, hysteretic energy dissipation characteristics and high Damping characteristics, so it is widely used in engineering fields. In recent years, with the further understanding of material properties and the improvement of industrial production capacity, shape memory alloy materials have attracted increasing attention and have been gradually introduced into the field of building structures. Many scholars have proposed to introduce shape memory materials into bea...

Claims

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Application Information

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IPC IPC(8): E04B1/58E04B1/98
Inventor 王伟刘佳陈以一
Owner TONGJI UNIV
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