Self-restoring ductility steel support adopting shape memory alloys (SMA)

Abstract

The invention provides a self-restoring ductility steel support adopting shape memory alloys (SMA). The support is mainly composed of rectangular steel plates, end plates with openings, steel pipes with holes, movable slide blocks, SMA bundles/wires and corresponding connecting parts. One ends of the rectangular steel plates are welded, and the other ends of the rectangular steel plates are clamped to the end plates through end anchorage devices. Through contact force transmitting, the slide blocks are arranged at the holes of the steel pipes, and the SMA bundles/wires are symmetrically wound onto the upper portions of the slide blocks. When moving relative to the steel pipes, the inner support bodies consume energy and provide stiffness and the bearing capacity through the two sets of tensile rectangular steel plates achieving pinch hysteretic characteristics, and the restoring function of the SMA bundles/wires wound onto the slide blocks at a tensile state all the time is achieved. The self-restoring ductility steel support adopting the SMA has the advantages of being good in storing capacity, high in axial deformation capacity, large in axial stiffness, high in bearing capacity, low in manufacturing cost, convenient to construct and the like. The self-restoring ductility steel support adopting the SMA is suitable for serving as a main lateral force resisting component of an aseismic structure and has wide engineering application prospects in an seismic fortified area.

Description

technical field [0001] The invention belongs to the field of anti-seismic technology of civil engineering structures, and in particular relates to a novel self-resetting ductile steel support applied in engineering structures. Background technique [0002] Earthquakes are one of the main reasons for the interruption or even collapse of structures. Although the current seismic design of structures has met the requirements of "not to collapse after a large earthquake", the irregular reciprocating vibration of earthquakes under strong earthquakes can easily lead to serious damage to structures. , The excessive residual deformation of the structure after the earthquake increases the difficulty of repairing the structure after the earthquake and causes huge economic losses. Therefore, it is of great significance to develop a new type of anti-lateral force member with small residual deformation and self-resetting function to reduce structural earthquake damage and economic loss af...

AI Technical Summary

Problems solved by technology

However, the existing self-resetting steel supports still have some disadvantages: (1) When prestressed steel strands are used as the reset device, due to the limited length of the support and the steel strands must be in an elastic state, the axial direction of the self-resetting steel supports Insufficient deformability

In addition, overly full energy consumers can significantly increase the amount of strands used

The prestress applied in the steel strand will also produce excessive additional stress on the surrounding components; (2) When SMA is used as the reset device, although a large axial deformation can be achieved, due to the hysteresis curve of the energy dissipation device Too full leads to the huge amount of SMA wire used to realize the reset ability, and the cost is expensive

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