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| 多点激励下多跨斜拉桥缩尺模型的地震响应研究．部分1：振动台试验 | |
| 作者姓名： | Zhou-hong ZONG Rui ZHOU Xue-yang HUANG Zhang-hua XIA |
| 作者单位： | [1]School of Civil Engineering, Southeast University, Nanjing 210096, China; [2]State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China; [3]School of Civil Engineering, Fuzhou University, Fuzhou 350108, China |
| 基金项目： | Project supported by the National Natural Science Foundation of China （Nos. 51178101 and 51378112）, the Doctoral Program Project of the Ministry of Education （No. 20110092110011）, and the National Key Laboratory of Civil Engineering Disaster Prevention of Tongji University （No. SLDRCE08-HZ-02）, China |
| 摘 要： | 研究目的：创新要点：为多塔斜拉桥在一致激励和非一致激励下地震响应的研究提供地震模拟振动台全桥试验方法，并有助于加强多塔斜拉桥抗震性能和抗震设计的认识。1．建立了地震模拟振动台多台阵试验方法，并首次将其应用于多塔斜拉桥全桥比例缩尺模型的地震响应分析之中；2．通过地震模拟振动台试验，揭示了多塔斜拉桥在多点一致激励和多点非一致激励的地震响应特性并提出了多塔斜拉桥在强震下的破坏模式。研究方法：1．基于动力相似理论，设计与制作了多塔斜拉桥的全桥比例缩尺模型（图2）；2．利用地震模拟振动台多台阵试验，根据在不同地震波作用下和考虑行波效应后多塔斜拉桥模型的主梁和主塔响应，分析了多塔斜拉桥在多点一致激励和多点非一致激励的地震响应特性（图5～图8）；3．根据在地震波不同强度作用下多塔斜拉桥模型的主梁和主塔响虚，分析了多塔斜拉桥在强震下的破坏模式和地震响应（图9）。重要结论：1．江心波作用下该多塔斜拉桥的地震响应大于其他三种地震波；2．多塔斜拉桥在抗震设计时需要考虑行波效应的影响；3．在El-Centro波的加速度峰值高达4．0m／s^2时，多塔斜拉桥模型出现了支座破坏。 |
| 关 键 词： | 多塔斜拉桥 地震模拟振动台台阵试验 多点激励 行波效应 破坏模式 |
Seismic response study on a multi-span cable-stayed bridge scale model under multi-support excitations. Part I: shaking table tests |
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| Zhou-hong ZONG,Rui ZHOU,Xue-yang HUANG,Zhang-hua XIA.Seismic response study on a multi-span cable-stayed bridge scale model under multi-support excitations. Part I: shaking table tests[J].Journal of Zhejiang University Science,2014,15(5):351-363. | |
| Authors: | Zhou-hong Zong Rui Zhou Xue-yang Huang Zhang-hua Xia |
| Institution: | 1. School of Civil Engineering, Southeast University, Nanjing, 210096, China 2. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai, 200092, China 3. School of Civil Engineering, Fuzhou University, Fuzhou, 350108, China |
| Abstract: | With the rapid development of bridge engineering in China, multi-span cable-stayed bridges have become one of the main structures of modern highways and railways for crossing rivers or straits. In this study, a 1:100 scale model of a three-tower cable-stayed bridge was tested using a shaking table array system. The mechanism associated with the seismic response of the scale model under uniform and non-uniform excitations was clarified. The results from the tests indicated that: (1) the strong vibration responses of the main girder and towers under four different horizontal earthquake wave excitations were identified, and the seismic responses of the scale model were most evident under uniform Jiangxin (JX) wave excitation; (2) the seismic performances of the main girder and towers of the scale model were adversely affected by traveling wave effects, especially when the wave velocity exceeded 616 m/s, which suggests that traveling wave effects should be considered in the seismic design of multi-tower cable-stayed bridges; (3) when the peak acceleration value of the El Centro (EC) wave reached 4.0 m/s2, shear failure of the bearing of the middle tower first appeared. This kind of shaking table tests will help to improve our understanding of dynamic performance, and will be especially useful in the design process and numerical simulation of multi-span cable-stayed bridges with large span subjected to spatially varying earthquake ground motions. |
| Keywords: | Multi-span cable-stayed bridge Earthquake shaking table tests Uniform excitations Non-uniform excitations Traveling wave effect Shear failure of bearing |
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