三塔两跨悬索桥行波效应振动台试验及数值研究  

Shake table tests and numerical analysis for traveling wave effect of a three-tower two-span suspension bridge

作　　者：闫聚考[1,2] 李建中[2] 彭天波[2] 王军文[3] 

机构地区：[1]石家庄铁道大学河北省大型结构健康诊断与控制重点实验室,石家庄050043 [2]同济大学土木工程防灾国家重点实验室,上海200092 [3]石家庄铁道大学土木工程学院,石家庄050043

出　　处：《振动与冲击》2016年第7期44-48,55,共6页Journal of Vibration and Shock

基　　金：国家科技支撑计划项目资助(2009BAG15B01);973计划项目资助(2013CB036302);国家自然科学基金项目资助(51508347);河北省大型基础设施防灾减灾协同创新中心资助

摘　　要：为了研究行波效应对大跨多塔连跨悬索结构抗震性能的影响,以泰州长江公路大桥为背景,设计并制作1∶40缩尺比例模型,进行了全桥振动台模型试验。采用中塔与主梁间弹性索连接的纵向约束结构体系,试验分别测试了不同视波速下行波效应对全桥位移响应的影响。振动台试验表明,考虑行波效应时,中塔顶位移、北塔梁纵向相对位移会有明显增大,最大增幅>50%;主桥梁与引桥梁纵向相对位移也会有明显增大,增大幅值>1倍。因此,仅考虑一致地震激励不能保证大跨度多塔悬索桥的结构安全。通过比较试验结果和数值计算结果可知,试验结果与有限元数值模拟结果较接近、吻合较好。数值计算所采用的绝对位移法分析行波效应方法操作简单,力学概念清晰,可方便的应用到大跨度桥梁行波效应分析中。In order to study traveling wave effect of a long-span multi-tower suspension structure,a 1 /40 scale model for Taizhou Changjiang Highway Bridge was designed,constructed and tested on a shaking table. Elastic cables were adopted to connect the main beam and the middle tower. The shake table test method was used to measure the traveling wave effect on the seismic displacement responses of the bridge model under different apparent wave velocities.The test results showed that the structural displacement responses increase remarkably considiering the traveling wave effect,comparing with those under uniform seismic excitation,the top longitudinal displacement of the middle tower and the relative longitudinal displacement between the main beam and the north tower increase more than 50 percent; the relative longitudinal displacement between the main beam and the approach bridge beam increases more than 1 times;therefore,the long-span multi-tower suspension bridge is unsafe only considering uniform seismic excitation. Comparing the results of shaking table tests with those of numerical analysis,it was shown that the test results are close to those of the FE numerical simulation; for the numerical analysis of the traveling wave effect,the absolute displacement method is simpler,its mechanics concepts are very clear; the absolute displacement method can be applied in analyzing the traveling wave effect for long-span bridges.

关 键 词：三塔两跨悬索桥 行波效应 振动台试验 数值模拟 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]