高速铁路简支梁桥地震反应特性研究  

Seismic response characteristics of a high-speed railway simply-supported girder bridge

作　　者：陈令坤[1,2] 蒋丽忠[1,2] 余志武[1,2] 罗波夫[1,2] 

机构地区：[1]中南大学土木建筑学院,长沙410075 [2]中南大学高速铁路建造技术国家工程实验室,长沙410075

出　　处：《振动与冲击》2011年第12期216-222,共7页Journal of Vibration and Shock

基　　金：铁道部重大课题(2008G031-17;2009G-024);国家自然科学基金(50938008)

摘　　要：近年来高速铁路建设方兴未艾,地震作用下的高速铁路桥梁动力响应问题日益引起公众及研究者关注。基于有限元法,建立了高速铁路多跨简支梁桥的梁单元全桥空间分析模型和单墩实体模型,利用有限元软件及弯矩-曲率关系程序,计算了不同地震强度、不同地震荷载组合下高铁桥梁在是否考虑桩土作用、不同车速以及不同墩高等工况下的弹塑性地震反应,分析了不同参数影响下的地震反应特性。计算与分析结果表明:地质条件较好的情况下,桩土作用对地震响应的影响较小,可以采用简化方法考虑桩土作用;随着地震强度、车速和墩高等参数的增加,桥梁动力响应相应增加;地震波频谱特性对结构地震响应影响较大;桥墩在罕遇地震作用下会进入弹塑性状态,塑性铰在墩底形成,应加密墩底横向钢筋以保证其塑性变形能力。With fast development of high-speed railway in recent years, dynamic responses of high-speed railway bridges under earthquake were paid attention to by common people and researchers. The finite element method was employed to establish the beam element space analysis model of a high speed railway bridge and the solid model of a single pier here, by means of finite element software and bending moment-curvature relationship program, the elastic-plastic seismic responses of a high-speed railway bridge under different earthquake intensities and effect combinations were calculated considering different train speeds and soil-structure interactions （SSI）. The calculation results showed that the influence of SSI on the seismic responses is little under good geologic condition, the simplified method can be adopted to consider SSI; the seismic responses increase with increase in earthquake strength, train speed and pier height; the frequency characteristics of the seismic wave have great effects on the seismic responses of the structure; the piers enter elastic-plastic state and plastic hinges develope at the bottoms of the piers under the rare strong earthquake action, the stirrup densification should be taken to enforce the elastic-plastic deformation capacity of the piers.

关 键 词：地震特性 高速铁路 简支梁桥 弹塑性分析 

分 类 号：U448.13[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]