New Method for Inter-story Stiffness Identification of Shearing Structures Under Ambient Excitation
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摘要: 研究环境激励下剪切型结构的层间刚度识别问题,提出了一种新的解决方法.该方法采用自然激励技术实现结构随机响应向确定性响应的过渡;推演了剪切型结构自由振动的参数解耦方程,简化了识别过程、降低了计算量.将自然激励技术、参数解耦方法和扩展卡尔曼滤波算法三者有效结合,为环境激励下剪切型结构的刚度识别提供了一个较好的解决方案.以一个6自由度剪切型结构为例,对该方法进行了数值模拟,结果表明:该方法能比较准确地识别结构层间刚度,可用于剪切型结构健康监测的实际工程.Abstract: Inter-story stiffness identification of shearing structures under ambient excitation was studied and a new method was presented.In the method, the transition from structural random response to deterministic response was realized by the natural excitation technique (NExT).The parameter-decoupled free vibration equation of shearing structures was deduced, and the equation could simplify the process of identification and reduce the amount of calculation.Through the effective combination of the NExT, the parameter-decoupled method and the extended Kalman filter (EKF) algorithm, a good scheme was presented for inter-story stiffness identification of shearing structures under ambient excitation.Using a shearing structure with six-degree-of-freedom as example, the scheme was tested by numerical simulation.The results show that the inter-story stiffness can be identified basically with accuracy, and the scheme can be applied in practical projects for health monitoring of shearing structures.
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Keywords:
- structures /
- ambient excitation /
- natural excitation technique /
- decoupling /
- Kalman filtering /
- identification
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