| 钢管混凝土组合桁梁-格构墩轻型桥梁振动台阵试验研究 |
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| 引用本文： | 吴庆雄,黄育凡,陈宝春.钢管混凝土组合桁梁-格构墩轻型桥梁振动台阵试验研究[J].工程力学,2014,31(9):89-96. |
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| 作者姓名： | 吴庆雄 黄育凡 陈宝春 |
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| 作者单位： | 1.福州大学土木工程学院,福建,福州 350108; |
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| 基金项目： | 福建省杰出青年科学基金项目(2012J06013);教育部“新世纪优秀人才支持计划资助”项目(NCET-13-0737) |
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| 摘 要： | 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。
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| 关 键 词： | 桥梁工程 钢管混凝土组合桁式梁 钢管混凝土格构墩 地震响应 振动台阵试验 抗震分析 |
| 收稿时间： | 2013-03-31 |
SHAKING TABLES TESTING STUDY OF LIGHTWEIGHT BRIDGE WITH CFST COMPOSITE TRUSS GIRDER AND LATTICE PIER |
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| Affiliation: | 1.College of Civil Engineering, Fuzhou University, Fuzhou, Fujian 350108, China;2.Department of Construction, Università IUAV di Venezia, Venice 30123, Italy |
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| Abstract: | In order to study the aseismic performance of a lightweight bridge with concrete-filled-steel tube (CFST) composite truss girders and lattice piers, took Ganhaizi Bridge as a prototype, one scale specimen of 1:8 with two spans and three lattice high piers was designed for a multi-shaking table test. The test was carried out on the earthquake simulator of a unique triple shaking table array system in Fuzhou University, China. Adopted the design seismic wave of a real bridge, its basic dynamic characteristics, aseismic performance and failure characteristics were studied. The results indicate that the ratios of the frequency to the displacement between a specimen and a real bridge are corresponding to a similitude relationship. Under a transverse or a longitudinal excitation, the acceleration in lattice zones significantly amplifies, and decreases the acceleration on a concrete deck. The strain under the transverse direction is larger than that under the longitudinal direction, meanwhile, it is unnecessary to consider the combination of two directions. The displacement on the top of a pier is less than the limitation value under design ground motions. The specimen is not failed for all testing cases, which reveal that a lightweight bridge with CFST composite truss girders and lattice piers has a favorable aseismic performance. |
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