【摘 要】
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This paper presents a three-step method for the stiffness identification of inter-story shearing structures under ambient excitation.The transition from structu
【机 构】
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China Central Radio & TV University,Beijing Key Laboratory of Earthquake Engineering and Structural
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This paper presents a three-step method for the stiffness identification of inter-story shearing structures under ambient excitation.The transition from structural random response to deterministic response is realized by the natural excitation technique(NEXT).The parameter-decoupled free vibration equation of inter-story shearing structures is deduced,which can simplify the procedure 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 is presented for stiffness identification of inter-story shearing structures under ambient excitation.Using inter-story shearing structures with six-degree-of-freedom and ten-degree-of-freedom as examples,the scheme is tested by numerical simulation and experiment.The result shows that the maximum of identification error is 7.82%,and it can reach the requirement of engineering application basically.
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