【摘要】 建议即使在大于规范规定的E2水平的地震作用下桥梁结构也不应出现倒塌、落梁等严重影响交通安全、危害人员生命的震害现象,并相应地提出了三水平设防的桥梁抗震设计方法的抗震性能要求.介绍了实现此方法的一种多道防线抗震球型钢支座的结构形式及其工作机理,最后简要介绍了对该支座进行的力学性能试验,试验结果表明这种支座可以实现三水平设防的桥梁抗震设计,并具有稳定可靠的抗震性能.更多还原

【Abstract】 Collapse of piers and unseating of girders should be avoided even under earthquakes beyond the two levels of seismic intensities,and seismic performance requirements of a new seismic design method are presented for three levels of seismic intensities.A multi-defense aseismic spherical(MDAS) bearing is used to trigger every seismic defense and change the bridge structure adaptively.The configuration and working mechanism of MDAS bearings are introduced firstly,the results of mechanical property test of a MDAS bearing are presented.The design requirements prove to be all satisfied and the seismic isolation performance of the bearing is effective and reliable.更多还原