高烈度地震区铁路简支梁常用桥墩抗震性能研究  

Study on Seismic Performance of Common Pier Using for Railway Simply Supported Beam in High Intensity Seismic Region

作　　者：武兵 WU Bing(China Railway SIYUAN Survey and Design Group Corporation,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《建材世界》2024年第2期90-93,共4页The World of Building Materials

摘　　要：分别选取三种不同墩高桥墩,对比研究普通支座体系和减隔震支座体系下,常用32 m跨度铁路简支梁桥墩在A_(g)=0.3g峰值加速度下的抗震性能。运用有限元软件进行计算分析,结果表明:采用普通支座体系,常用简支梁桥墩抗震性能无法满足罕遇地震下的性能要求;采用双曲面球形减隔震支座,能够显著减少墩底内力,桥墩处于基本弹性状态。在选取的非线性计算参数下,墩底弯矩减隔震率在58%以上。The seismic finite element models of the 32 m simply-supported railway bridge with the common pier and three different height piers were established,respectively,and the seismic performance of the bridge under ordinary bearing system and reduced-isolation bearing system was analyzed and compared.The results show that the common support system can’t meet the performance requirement under the rare earthquake for the common simply-supported railway bridge.The hyperboloid spherical isolation bearings can significantly reduce the internal force at the bottom of pier.Based on the selected nonlinear calculation parameters,the damping ratio of the pier at the bottom for the bending moment amounts to more than 58%,and a better damping effect can be obtained with a shorter height of the pier.

关 键 词：高烈度震区 简支梁 抗震设防 减隔震支座 铁路桥梁 减隔震率 

分 类 号：U443.22[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]