桥梁典型减隔震装置性能对比研究

Comparison and Study on Typical Seismic Isolation Device Performance of Bridge

减隔震支座的选择是减隔震设计的关键环节,然而目前研究多针对单一类型减隔震支座而没有对不同类型减隔震支座的适用性进行比较。通过对比几种桥梁典型减隔震支座的减震原理和关键力学性能,提出桥梁典型减隔震支座的适用范围。结合某一工程实例对两种典型减隔震支座的减震效果进行对比。分析结果表明,采用减隔震支座会大大降低传到结构上的地震力,但同时引起较大的震后位移。结论表明结构减隔震设计应合理选择减隔震支座,优化其力学参数,改善结构的自振周期,平衡地震力与地震位移的关系,最终实现结构的抗震设防目标。

The selection of seismic isolation bearings is the key link in the design of seismic isolation.But the present study is limited in the single type of seismic isolation bearings without the comparison of the applicability of various types of seismic isolation bearings.The article puts forward the applicable range of the typical bearings for the bridges according to the contrast of the seismic isolation principles and the key mechanics performances of several typical bearings of bridge.The article compares the seismic isolation effects of two typical seismic isolation bearings used in an engineering case.The analysis result shows that the use of seismic isolation bearing can greatly reduce the seismic reaction transmitting to the structures, but will induce the greater post-earthquake displacement.The conclusion shows that the seismic isolation design of structure should reasonably select the seismic isolation bearing,optimize its mechanics parameters,improve the natural period of vibration of the structures and balance the relationship of the seismic reaction and displacement in order to finally realize the target of seismic prevention for the structures.