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首页> 外文会议>World conference on earthquake engineering;WCEE >UNDERSTANDING THE DYNAMICS OF MULTI-DEGREE-OFFREEDOM STRUCTURES SUBJECT TO MULTIPLE SUPPORTEARTHQUAKE EXCITATION
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UNDERSTANDING THE DYNAMICS OF MULTI-DEGREE-OFFREEDOM STRUCTURES SUBJECT TO MULTIPLE SUPPORTEARTHQUAKE EXCITATION

机译：理解多重支撑地震作用下的多自由度结构的动力学

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摘要

Multiple support excitation during earthquakes is a significant hazard for structures with largedistances between ground support points. Typically this applies to long-span bridges, but the hazardmay also be significant for buildings and other structures with a large plan area, particularly if thegeological/soil conditions under the structure are non-uniform. The current approach for modellingmultiple support excitation of structures uses a linear superposition method based on responsespectrum techniques. Little experimental testing has been carried out in order to verify the theory andto test the nonlinear behaviour of these types of structures under extreme loading cases. In this paperwe present results for a series of experimental tests on a two degree of freedom system. There is goodagreement between the experimental data and a simple numerical model analysed using directintegration methods. The results also show that, for a two degree of freedom model, if multiplesupport excitation is ignored and only synchronous load cases are considered, the peak response of thesystem may be significantly underestimated.
机译：对于地面支撑点之间距离较大的结构，地震期间的多点支撑激励是一个重大危险。通常，这适用于大跨度桥梁，但对于平面面积较大的建筑物和其他结构，危害也可能很大，特别是如果结构下的地质/土壤条件不均匀的话。用于建模结构的多支撑激励的当前方法使用基于响应谱技术的线性叠加方法。为了验证理论并测试这些类型结构在极端载荷情况下的非线性行为，很少进行实验测试。在本文中，我们介绍了针对两自由度系统的一系列实验测试的结果。实验数据与使用直接积分法分析的简单数值模型之间具有良好的一致性。结果还表明，对于两自由度模型，如果忽略多支撑激励并且仅考虑同步负载情况，则系统的峰值响应可能会被大大低估。

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