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Simulation of floor response spectra in shake table experiments

机译:振动台实验中地板响应谱的仿真

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Among several different experimental techniques, used to test the response of structures and to verify their seismic performance, the shake table testing allows to reproduce the conditions of true effects of earthquake ground motions in order to challenge complex model structures and systems. However, the reproduction of dynamic signals, due to the dynamics of the shake table and of the specimen, is usually imperfect even though closed-loop control in a shake table system is used to reduce these errors and obtain the best fidelity reproduction. Furthermore, because of the dynamic amplifications in the specimen, the signal recorded at desired locations could be completely different from the expected effect of shake table motion. This paper focuses on the development of practical shake table simulations using additional 'open loop' feedforward compensation in form of inverse transfer functions (i.e. the ratio of the output structural response to an input base motion in the frequency domain) in order to obtain an acceptable reproduction of desired acceleration histories at specific locations in the specimen. As the first step, a well-known global feedforward procedure is reformulated for the compensation of the table motion distortions due to the servo-hydraulic system. Subsequently, the same concept is extended to the table-structure system to adjust the shake table input in order to achieve a desired response spectrum at any floor of the specimen. Implementations show how such a method can be used in any experimental facility.
机译:在用于测试结构响应和验证其抗震性能的几种不同实验技术中,振动台测试允许重现地震地震动的真实影响条件,以挑战复杂的模型结构和系统。但是,即使使用振动台系统中的闭环控制来减少这些误差并获得最佳保真度,由于振动台和样品的动力学,动态信号的再现通常也不完美。此外,由于样品中的动态放大,在所需位置记录的信号可能与振动台运动的预期效果完全不同。本文重点介绍了使用附加的“开环”前馈补偿以逆传递函数(即频域中输出结构响应与输入基本运动的比率)形式进行的实际振动台仿真的开发,以便获得可接受的结果。在样品的特定位置上复制所需的加速度历史记录。第一步,重新制定众所周知的全局前馈程序,以补偿由于伺服液压系统而引起的工作台运动失真。随后,将相同的概念扩展到工作台结构系统,以调整振动台输入,以便在样品的任何地板上获得所需的响应谱。具体实施说明了如何在任何实验设施中使用这种方法。

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