超高墩大跨度刚构-连续梁桥抗震性能研究  

Study of Seismic Performance of Long-Span Rigid Frame-Continuous Girder Bridge with High-Rise Piers

作　　者：郝晓光 杨未蓬 唐辉 HAO Xiao-guang;YANG Wei-peng;TANG Hui(CCCC Infrastructure Maintenance Group Co.,Ltd.,Beijing 100011,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]中交基础设施养护集团有限公司,北京100011 [2]重庆交通大学土木工程学院,重庆400074

出　　处：《世界桥梁》2020年第4期35-39,共5页World Bridges

基　　金：国家自然科学基金项目(51308571)。

摘　　要：为指导超高墩大跨度刚构-连续梁桥的抗震性能优化设计,以墩高超过100m、主梁总长达480m的预应力混凝土刚构-连续梁桥--厄瓜多尔瓜亚萨明特大桥为研究对象,采用SAP2000有限元软件建立全桥模型,在动力分析的基础上,针对结构抗震性能进行阻尼器参数优化设计分析。结果表明:设置粘滞阻尼器可有效减小该桥墩底截面的纵向弯矩、横向弯矩和梁端的纵向地震位移,在两侧梁端布置默认速度指数为0.3的阻尼器,阻尼器的阻尼系数取12 000kN·(s/m)0.3为最优设计方式;在优化方案下,各桥墩的墩底、墩顶控制截面的抗弯、抗剪能力需求比均大于1,结构处于弹性工作范围内,抗震性能满足规范要求。To guide design optimization of seismic performance of the long-span rigid framecontinuous girder bridge with high-rise piers,the Ecuador Guayasamin Bridge is cited as an example for the study.The bridge is a prestressed concrete rigid frame-continuous girder bridge with a main span of 480 mand with pier height exceeding 100 m.The finite element software SAP2000 was used to build the model of the overall bridge.Based on the dynamic analysis,the damping parameters were optimized to improve the seismic performance of the structure.The results show that viscous dampers can effectively reduce the longitudinal and transverse bending moment in the pier base section as well as the longitudinal seismic displacement at the girder ends.The best option is to install the dampers at the two ends of the girder,with the default velocity index set at0.3 and the damping coefficient at 12 000 kN· (s/m)0.3.After optimization,the bending and shearing capacity demanding ratios for the control sections in the pier base and on the pier top are all bigger than 1,the structure of Ecuador Guayasamin Bridge is within the range of elastic working condition,and the seismic performance can meet the code requirements.

关 键 词：刚构-连续梁桥 超高墩 大跨度 抗震性能 阻尼器 优化 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]