【作者】 房贞政； 张超； 陈永健； 郑则群； 许莉；

【Author】 Fang Zhenzheng~(1,2) Zhang Chao~(1,2) Chen Yongjian~(1,2) Zheng Zequn~(1,2) Xu Li~(1,2) (1.Fuzhou University,Fuzhou 350108,China;2.SDRCCE,Fuzhou University,Fuzhou 350108,China)

【机构】 福州大学； 福州大学福建省海峡两岸土木工程防震减灾工程研究中心；

【摘要】 多塔长跨斜拉桥受力复杂,结构地震响应十分复杂。本文以武汉二七长江大桥为工程背景,设计振动台试验模型并开展三台阵振动台试验,探讨三塔长跨结合梁斜拉桥在一致激励及多点激励下的地震响应规律。动力特性分析表明此桥型中塔纵弯刚度较小;一致激励振动台试验结果表明主塔塔顶和主梁具有较大的地震响应;多点激励试验结果表明,行波效应对地震响应的影响不可忽略。更多还原

【Abstract】 As long-span cable-stayed bridge with multi-tower has complex mechanical characteristics,the seismic response is quite different when the lightweight composite girder is adopted.In this paper,Wuhan Yangtze River Bridge is taken as background project and test mode of multi-tower cable-stayed bridge is designed.Based on shaking table test of Fuzhou University,the seismic response laws of long-span cable-stayed bridge under uniform excitation and nonuniform excitation were discussed respectively.The dynamic property identified from recorded data shows the longitudinal stiffness of middle towers is relatively small.Results of shaking table test show that the tower and girder with greater seismic response and wave propagation effects on seismic response can not be ignored.更多还原