多道防线抗震球型钢支座的开发和试验研究

Development and Test of a Multi-Defense Aseismic Spherical Bearing

摘要:

鉴于地震发生时间、地点和烈度的不确定性，桥梁结构遭受大于规范规定的E2水平地震作用的可能性是不能忽视的。本文建议即使桥梁结构在大于E2水平的地震作用下也不应出现倒塌、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。本文首先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，然后介绍了该支座的工作机理，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方法，并具有稳定可靠的抗震性能。

Abstract:

Because of the uncertainty of the time, location and magnitude of the next earthquake, it seems necessary to specify the seismic performance of bridges beyond the two levels of seismic intensities used in most of the seismic design codes. It’s suggested in this paper that collapse of piers and unseating of girders should be prevented even under earthquakes beyond the two levels of seismic intensities, and seismic performance requirements of a new seismic design method is presented for three levels of seismic intensities. A multi-defense aseismic spherical (MDAS) bearing is used to trigger each seismic defense and change the bridge structure adaptively. The configuration and working mechanism of MDAS bearings are introduced firstly in this paper, the results of mechanical properties test of an MDAS bearing are presented, and it’s shown that the design requirements are all satisfied and the seismic isolation performance of the bearing is effective and reliable.