摘要
以主跨216m杭温铁路永嘉右行线跨甬台温特大桥为背景,研究钢混混合梁桥与常规混凝土梁桥抗震性能的差异。设计了与原桥同结构形式和跨度的混凝土梁桥,以钢混结合段试验数据为支撑,使用OpenSees建立两座桥的有限元模型,基于耐震时程分析方法计算两座桥的地震响应,对比分析动力特性、梁体应力位移和桥墩易损性的差异。结果表明:混合梁桥主振型周期为3.33 s,周期更长,结构更柔;混凝土梁桥主振型周期为1.46 s,周期更短,结构更刚。在地震作用下,混合梁桥的梁体应力更小,位移更大,且在墩梁连接位置会发生较大错动和抬升,该处支座更容易损坏。混合梁桥4个桥墩的损伤程度由大到小依次为:3号墩、2号墩、1号墩、4号墩。当发生PGA为0.32g的地震时,混合梁桥4个桥墩发生轻微损伤的概率分别为77.75%、90.26%、99.47%和75.14%,混凝土梁桥4个桥墩发生轻微损伤的概率分别为99.97%、80.21%、95.29%和99.89%。钢混混合结构能够减小边墩的损伤程度,但会增加中墩的震损风险。
Based on the Yongtaiwen Bridge on Yongjia Right Line of Hangzhou Wenzhou Railway with a main span of 216m,the difference of seismic performance between steel-concrete hybrid beam bridge and conventional concrete beam bridge is studied.A concrete beam bridge with the same structure and span as the original bridge is designed.Supported by the test data of steel-concrete joint section,the finite element models of the two bridges are established by using OpenSees.The seismic responses of the two bridges are calculated based on the seismic time history analysis method,and the differences of dynamic characteristics,beam stress and displacement and pier vulnerability are compared and analyzed.The results show that:The main vibration mode period of the hybrid beam bridge is 3.33s,the period is longer and the structure is more flexible.The period of main vibration mode of concrete beam bridge is 1.46s,the period is shorter and the structure is more rigid.Under the action of earthquake,the beam stress of the hybrid beam bridge is smaller,the displacement is larger,and there will be large dislocation and lifting at the connection of pier beam,where the support is likely to be damaged.The damage degree of the four piers of the hybrid beam bridge from large to small is:3# pier,2# pier,1# pier and 4# pier.When an earthquake with a PGA of 0.32g occurs,the probability of minor damage to the four piers of the hybrid girder bridge is 77.75%,90.26%,99.47% and 75.14%respectively.The probability of minor damage to the four piers of the concrete girder bridge is 99.97%,80.21%,95.29% and 99.89%respectively.Steel-concrete hybrid structure can reduce the damage degree of side piers,but will increase the seismic damage risk to middle piers.
作者
杨朝龙
沈林白
王德志
文望青
蒲黔辉
YANG Chaolong;SHEN Linbai;WANG Dezhi;WEN Wangqing;PU Qianhui(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道标准设计》
北大核心
2023年第4期92-100,共9页
Railway Standard Design
基金
四川省科技计划项目(2021YJ0054)
中铁第四勘察设计院集团有限公司科技研究开发项目(2019K002)
中国铁路上海局集团有限公司科技研究开发项目(2020136)。
关键词
铁路桥
刚构连续梁桥
混合梁桥
地震易损性
耐震时程分析
有限元法
抗震性能
railway bridge
rigid frame-continuous bridge
hybrid beam bridge
seismic vulnerability
endurance time analysis
Finite Element Method
seismic performance
