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为了研究钢管混凝土组合桁梁-格构墩轻型桥梁的抗震性能,以干海子大桥为原型,设计制作了几何缩尺比例1∶8的两跨钢管混凝土组合桁梁-格构墩试验模型,利用福州大学地震模拟振动台台阵系统,采用实桥的设计地震波,进行了该轻型桥梁的基本动力特性试验、抗震性能试验及破坏特性研究。结果表明,模型实测频率和位移与实桥满足相似比关系;在横向或纵向地震作用下,桥墩格构式区域加速度放大效应明显,减小了主梁混凝土顶板的加速度响应;相同强度下,横桥向地震作用桥墩应变大于纵桥向地震作用,同时可以不考虑纵、横向地震力共同作用。在设计地震动作用下,墩顶位移满足位移限值的规定;模型未出现开裂和破坏现象,表明钢管混凝土组合桁梁-格构墩轻型桥梁具有良好的抗震性能。
In order to study the seismic performance of CFST truss girder - lattice pier lightweight bridges, a prototype of two-span CFST truss girder-lattice pier with geometric scale ratio of 1: 8 was designed and manufactured with the prototype of Qianhaizi Bridge. The seismic simulation shaking table system of Fuzhou University adopted the design seismic wave of the real bridge to study the basic dynamic characteristics test, the seismic performance test and the failure characteristics of the light bridge. The results show that the measured frequencies and displacements of the model satisfy the similarity relation with the real bridge. Under lateral or longitudinal earthquake, the acceleration effect of the bridge lattice is obvious, which reduces the acceleration response of the concrete roof of the main girder. Under the same strength, Bridge to the seismic role of the bridge pier strain greater than the longitudinal seismic effect, at the same time can not consider the vertical and horizontal seismic forces together. Under the action of design ground motion, the displacement of pier top meets the requirement of displacement limit. There is no cracking and failure in the model, which shows that CFST truss girder - lattice bridge lightweight bridge has good seismic performance.