Energy dissipation and shock absorption device suitable for pulse large displacement

Abstract

The invention provides an energy dissipation and shock absorption device suitable for pulse large displacement. The device comprises a lower connecting steel member, bolt holes, sliding grooves, triangular mild steel plates, steel baffles, an anchoring plate, shape memory alloy bars and an upper connecting steel member. The lower connecting steel member is anchored with the bent cap pre-embedded steel member through the bolt hole; the upper connecting steel member is anchored with the main beam through the bolt holes; the lower sliding groove slides along a lower connecting steel member guide rail, and the upper sliding groove slides along an upper connecting steel member guide rail; the bottom of the triangular mild steel plate is welded on two sides of the lower chute, and the top is welded with the round-head short rods at two ends and clamped between the adjacent steel baffles; and two ends of the shape memory alloy bar are anchored on the anchoring plate. The device can achieve balance between the relative displacement of the pier beam and the internal force of the pier column, beam falling and fixed pier column damage under the strong pulse effect are avoided, the safety of a whole bridge structure system is better protected, and the device is low in manufacturing cost, convenient to construct and easy to repair and replace after an earthquake.

Description

technical field [0001] The invention belongs to the field of bridge engineering, and in particular relates to an energy-consuming shock-absorbing device adapted to pulse large displacement. Background technique [0002] my country is located at the junction of the circum-Pacific seismic belt and the Himalayan seismic belt. In recent decades, many extremely destructive earthquakes have occurred, causing serious damage to the bridge structure near the fault. Typical bridge damage is falling beams, collapsed piers, etc. The shock-absorbing and isolating devices commonly used at present mainly deal with far-field vibrations with small seismic displacement requirements, and realize energy consumption through reciprocating hysteresis. However, near-fault ground motion usually has a significant velocity pulse effect, which leads to excessive relative displacement of piers and beams, making it difficult for existing conventional seismic isolation devices to function. [0003] Both ...

AI Technical Summary

Problems solved by technology

It is difficult for a single soft steel plate to effectively limit the pulse displacement due to too small post-buckling stiffness, resulting in excessive pier beam displacement; although SMA alone has a good energy-dissipating position-limiting effect, it is often too expensive to be used in actual engineering middle application

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