桩基础抗震储备对桥梁结构抗震安全影响

Influence of seismic resistance reserves of piled foundation on safety of bridge in seismic resistance design

地震中桩基础一旦发生损伤或破坏,会带来地震后桥梁安全排查困难和抢修时间长等问题,而且因基础加固难度大和加固成本高,还会严重影响灾后的恢复工作。因此,许多国家越来越重视桥梁基础的抗震储备。但是,这一理念在我国尚未得到普遍认识,导致我国桥梁桩基础结构普遍偏弱,其抗震储备低于桥墩。通过分析桥梁抗震设计原则,比较中日两国典型桥梁下部结构的配筋以及分析典型桥梁的非线性地震响应,阐述桩基础抗震储备对桥梁结构抗震安全影响。

It is very difficulty to check the wounds of piles and it will take long time to repair it if the piled foundation was harmed or failed in earthquake.The hard work and the high cost for strengthening piles will also delay the reconstruction and even block its recover,that＇s why many countries are paying more and more attention to seismic resistance reserves of piled foundation.Unfortunately this idea has not yet been completely accepted by our civil engineering so as to lead the bridge piled foundation weaker,the reserves of piled foundation is generally less than the piers.This paper analyzes and explaines the influence of the seismic resistance reserves of piled foundation on the safety of bridge by showing the principles,comparing the bar arrangement of typical piers and piles,and analyzing the sample bridges in China and Japan by non-liner pushover analysis.