主线桥对小半径曲线匝道桥地震响应影响与简化分析模型  

Analysis of Main Bridge Influencing Seismic Response of Small Radius Curve Ramp and Simplified Analysis Model

作　　者：胡松明 郑志均[3] 刘朵 管仲国[1] HU Songming;ZHENG Zhijun;LIU Duo;GUAN Zhongguo(Department of Bridge Engineering,Tongji University,Shanghai 200092,China;Jiangsu Transportation Institute,Nanjing 211112,China;Architectural and Civil Engineering Design Irstitute Co.,LTD.,Hangzhou 310001,China)

机构地区：[1]同济大学桥梁工程系,上海200092 [2]苏交科集团股份有限公司交通科学研究院,南京211112 [3]杭州市城建设计研究院有限公司,杭州310001

出　　处：《结构工程师》2021年第6期77-82,共6页Structural Engineers

摘　　要：以某城市复杂立交为背景,利用Sap2000有限元分析软件建立考虑立交主线桥影响的小半径曲线匝道结构动力分析模型,分析计算匝道桥的地震响应。对于常规体系和减隔震体系,通过分析含不同长度主桥的模型,确定适合的分析模型。提出一种用于解决类似问题的简化模型:匝道-盖梁-集中质量模型。结果表明,在小半径曲线匝道桥地震反应分析时,如果主线桥为常规体系,考虑主线桥影响是必要的,匝道地震响应有显著差别;如果主线桥为减隔震体系,则对匝道的地震响应影响有限,可不考虑;建立考虑主线桥影响的有限元模型时,取交汇处两端一联主线桥即可满足分析需要;匝道-盖梁-集中质量模型可以用于解决类似问题。A dynamic analysis model of small radius curve ramp structure considering the influence of the main bridge was established using Sap2000 FNA software.and the seismic response of ramp bridge was analyzed and calculated.For conventional system and system using rubber bearings,the appropriate analysis model was determined by analyzing the models with different length of main bridge.A simplified model was proposed to solve similar problems:ramp cap-beam lumped-mass model.The results show that in the seismic response analysis of small radius curve ramp bridge,if the main bridge is a conventional system,it is necessary to consider the influence of the main bridge,and the seismic response of the ramp is significantly different;i the main bridge uses rubber bearings,the impact on the seismic response of the ramp is limited and can not be considered;when establishing the finite element model considering the influence of the main bridge,a main bridge at both ends of the intersection is taken as the main line bridge.The ramp cap-beam lumped-mass mode can be used to solve similar projects.

关 键 词：桥梁抗震 曲线梁桥 匝道桥 橡胶支座 地震响应分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]