摘要
研究了考虑桩土效应的高铁大跨度系杆拱桥地震响应问题.以徐州至盐城客运专线上的钢管混凝土系杆拱桥为工程背景,通过有限元软件Midas/Civil分别建立了考虑桩土效应和不考虑桩土效应两种情形下的全桥有限元模型,选用50年超越概率为10%的反应谱方法对桥梁结构进行地震响应分析.研究结果表明:考虑桩土效应模型与基础固结模型相比,结构的自振周期延长,且对高阶振型影响显著.结构各部分的位移响应受边界条件的影响,增幅并不明显.由于该桥横向刚度相对较小,横向地震反应比纵向地震反应大,在抗震设计时应该着重考虑.通过反应谱分析表明:竖向地震的影响不可忽略,桩土效应对结构存在一定的影响.
The seismic response analysis of high-speed railway long-span tied arch bridge considering pile-soil effect was studied.Taking the concrete-filled steel tubular tied arch bridge on the Xuzhou-Yancheng Passenger Dedicated Line as the engineering background,the full-bridge finite element model considering the pile-soil effect and the pile-soil effect was established by the finite element software Midas/Civil.Seismic response analysis of the structure was carried out with a response spectrum with a probability of 10%.The results show that the effect of the soil on the structure is reflected by the effect of the pile-soil effect,which can reflect the dynamic characteristics of the structure.Compared with the basic consolidation model,the natural vibration period of the structure becomes larger,and the influence of the higher-order vibration mode is more obvious.The lateral stiffness of the bridge is relatively small,and should be taken seriously in seismic design.The maximum axial force,shear force and bending moment of the arch ribs occur at the arch foot.Longitudinal seismic loading mainly affects longitudinal displacement,vertical displacement,axial force,longitudinal shear force and in-plane bending moment.Lateral seismic loading is mainly affected by lateral displacement,lateral shear force and out-of-plane bending moment.Longitudinal and vertical seismic coupling effects are large,which increases the axial force of the arch ribs,and the influence of vertical earthquakes cannot be ignored.After considering the pile-soil effect,the axial force and the out-of-plane bending moment increase,and the in-plane bending moment decreases.The displacement response of each part of the structure has a certain increase,but since the contact between the pile foundation and the bedrock is simply treated as consolidation,the influence of the boundary effect is weakened,so the result is not obvious.The response spectrum analysis shows that the influence of vertical earthquake can not be ignored,and the pile soil effect has a cert
作者
贾宏宇
张智健
张政伟
梁斌
JIA Hongyu;ZHANG Zhijian;ZHANG Zhengwei;LIANG Bin(China Railway15th Construction Bureau First Engineering Group Corporation,Xi’an 710018,China;Civil Engineering School,Henan University of Science and Technology,Henan Luoyang471023,China)
出处
《河南大学学报（自然科学版）》
CAS
2019年第4期491-498,共8页
Journal of Henan University:Natural Science
基金
河南省科技厅产学研合作项目(2015HNCXY011)
中铁十五局集团有限公司重点科研项目(2016A1)
关键词
大跨度系杆拱桥
桩土效应
地震响应
动力特性
反应谱
long span tied arch bridge
pile soil effect
earthquake response
dynamic characteristics
response spectrum
