单肢转双肢薄壁高墩桥梁的抗震性能  

Seismic performance of single-limb to double-limb thin-walled high pier bridge

作　　者：卢尧 鞠秀颖 杨明[1] 常山 袁鹏飞 田林杰 LU Yao;JU Xiuying;YANG Ming;CHANG Shan;YUAN Pengfei;TIAN Linjie(School of transportation,Southeast University,Nanjing 210096,Jiangsu Province,P.R.China;China Road&Bridge Corporation,Beijing 100011,P.R.China)

机构地区：[1]东南大学交通学院,江苏南京210096 [2]中国路桥工程有限责任公司,北京100011

出　　处：《深圳大学学报（理工版）》2020年第2期151-157,共7页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(51078078)~~

摘　　要：为研究不同桩土模型对单肢转双肢薄壁高墩的地震响应差异,以及单肢转双肢薄壁高墩与双肢薄壁高墩地震响应的不同,以一座采用单肢转双肢薄壁高墩的大跨径桥梁为例,采用有限元软件Midas Civil建立三维动力分析模型,分析了直接嵌固、等效嵌固和六弹簧法3种桩土效应对桥墩抗震性能的影响.结果表明:对单肢转双肢高墩桥梁进行地震响应分析时,忽略桩土效应的计算结果并不总是偏于安全的,采用等效嵌固法模型的计算结果则是偏于安全的.三向地震作用下,单肢转双肢高墩的墩顶顺桥向极限位移值小于传统的双肢薄壁高墩的墩顶位移.In order to study the seismic response differences of different pile-soil models to the thin-walled bridge pier of single-limb to double-limb,the dynamic models are established by using the Midas Civil software.The effects on the seismic performance of this type of pier are analyzed by using three different kinds of pile-soil interaction of direct embedded model,equivalent embedded model and six-spring model.The double-limb thin-walled high pier model is also established for comparing the seismic response differences between the thin-walled bridge pier of single-limb to double-limb and the double-limb thin-walled high pier.The results show that when analyzing the seismic response of the thin-walled bridge pier of single-limb to double-limb,the calculated results by neglecting the pile-soil interaction are not always safe,but the results calculated by the equivalent embedded model are always safe.Under the action of three-way earthquake,the maximum displacement of pier top in the thin-wall high pier of single limb to double-limb is significantly less than that in the double-limb thin-walled high pier bridge.

关 键 词：桥涵工程 大跨径桥梁 单肢转双肢 桩-土相互作用 薄壁高墩 地震响应 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]