Multi-stage fortified seismic mitigation and absorption support

Abstract

The invention relates to the technical field of bridge supports, in particular to a multi-stage defense seismic mitigation and absorption support. The support comprises an upper connecting steel plate, an upper sliding cover plate, energy dissipation soft steel, shear keys and a lower connecting steel plate, the upper connecting steel plate is of a cylindrical structure and is fixed to the bottomof a bridge, a groove with a circular cross section is formed in the middle of the lower surface of the upper connecting steel plate, and the upper sliding cover plate is of a circular structure and is fixed to the top wall of the groove through the shear keys; the energy dissipation soft steel is of a strip-shaped structure, one end of the energy dissipation soft steel is fixed to the side wall of the groove, and a gap is formed between the other end of the energy dissipation soft steel and the upper sliding cover plate. The lower connecting steel plate is fixed to the top of a pier, and a lead core rubber vibration isolation support is arranged between the lower connecting steel plate and the upper sliding cover plate. The support has the advantages of being simple in structure, clear instress and the like, and multi-stage fortification and graded energy consumption under earthquakes of different intensities can be achieved.

Description

technical field [0001] The invention relates to the technical field of bridge supports, in particular to a shock-absorbing and isolating support for multi-level fortification. Background technique [0002] Bridges are very important links in the transportation system and are vulnerable to damage during earthquakes. The history of earthquake disasters shows that the damage of bridges in earthquakes will cause relatively large secondary disasters and economic losses. Therefore, it is of great significance to improve the seismic performance of bridges. In recent years, seismic isolation technology has been widely used in bridges. Anti-seismic technology uses anti-seismic devices to prolong the natural vibration period of the structural system to absorb seismic energy, thereby avoiding damage or collapse of the structure and improving the anti-seismic performance of the structure. [0003] Lead rubber bearing is one of the common shock-absorbing and isolating devices in bridg...

AI Technical Summary

Problems solved by technology

However, the existing lead-rubber bearings have little adaptability to deformation, and large-span and long-connected bridges often produce large seismic responses. Traditional lead-rubber bearings are difficult to adapt to large deformation requirements.

On the other hand, the energy dissipation capacity of the lead rubber bearing mainly depends on the cross-sectional area of ​​the lead core and the height of the bearing. The core rate should not be too large, so its energy dissipation capacity is limited

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