承台高度变化对桥梁墩桩抗震性能的影响  

Effects of pile caps height variety on seismic behavior of bridge pier piles

作　　者：黄显彬 侯松 廖曼 牟思佳 HUANG Xianbin;HOU Song;LIAO Man;MU Sijia(College of Civil Engineering,Sichuan Agricultural University, Dujiangyan 611830, China;Siehuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction, Dujiangyan 611830, China)

机构地区：[1]四川农业大学土木工程学院,四川都江堰611830 [2]村镇建设防灾减灾四川省高等学校工程研究中心,四川都江堰611830

出　　处：《地震工程与工程振动》2017年第6期154-161,共8页Earthquake Engineering and Engineering Dynamics

基　　金：村镇建设防灾减灾四川省高等学校工程研究中心资助项目(CDPMV1403);国家自然科学基金面上项目(4167020785)~~

摘　　要：以寿江大桥为研究对象,为研究承台高度变化对桥梁墩桩抗震性能的影响,采用规范公式计算和地震反应分析的方法,对寿江大桥在强震作用下的墩桩承载力进行分析。研究表明,原设计情况下,桥梁4、5#桥墩及其桩基在强震作用下承载力满足规范要求。变更设计承台提升14 m,设计基于现行规范地震烈度8度是满足要求的,但是4、5#桥墩对应的桩基在强震作用下(汶川地震重现的地震)都将发生受弯破坏,提出了桥梁设计相应抗震对策。对承台高度分别提升3 m、6 m、9 m、14 m进行桥梁墩桩地震反应分析,表明承台高度提升后桥梁抗震性能有所下降。研究为强震易发地区的高桩承台桥梁设计提供重要参考。To investigate the effects of pile caps height variety on seismic behavior of bridge pier piles, this paper takes Shoujiang bridge as the research object. Here, based on the method of standard formula calculation and seis- mic response analysis, we analyzed the pier pile bearing capacity of the Shoujiang bridge under strong earthquake conditions. The study shows that in the original design, the bearing capacity of #4, #5 bridge piers and their pile foundations under strong earthquake conditions meet the standard requirements. After changing the design, the pile caps were hoisted by 14 m compared with the orignal location, new design based on the seismic fortification intensi- ty of eight degrees meet the current specification requirement, but the pile foundations of #4 and #5 are exposed to occur bending failure under strong earthquake conditions （even in the earthquake of wenchuan earthquake recur- rence）. Therefore, we proposed the corresponding seismic countermeasures specifically for this situation. With the height of pile caps were increased by 3 m, 6 m, 9 m, 14 m respectively, seismic response analysis of bridge pier pile were conducted. The results indicated that the seismic behavior of the bridge will decline after the ascension of pile caps. The research achievement provide an important reference for the design of elevated pile cap bridge in strong earthquake prone areas.

关 键 词：高桩承台 地震 墩桩 承载力 

分 类 号：P315[天文地球—地震学] TU352[天文地球—固体地球物理学]