Parameters and unknown seismic excitations identification for nonlinear high-rise shear-type buildings using partial measurements

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (24) : 51-59.

QI Chengkai1，WU Jiamin1，HUANG Jinshan1，YANG Ning2,3

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Abstract

It is of great significance to identify the structural state of high-rise buildings under the action of earthquake. Due to many degrees of freedom, it is more difficult to identify the structural state and physical parameters of high-rise shear frames, especially under unknown earthquake excitations. For the situation of nonlinear high-rise shear frames subjected to strong earthquake excitations, partially observed absolute acceleration responses of the structure are used in the identification manner. Based on the generalized extended Kalman filtering with unknown input (GEKF-UI) recently developed by the authors’ group, a sub-structural method combined with GEKF-UI is proposed for the simultaneous identification of nonlinear high-rise shear-type structural system and the unknown earthquakes. The proposed method can identify each substructure independently in parallel computing by treating the boundary forces as additional unknown excitations but without observing the responses at the interfaces of each substructure，which avoids the error accumulation in the previous sub-structural identification methods. Finally, numerical examples are used to verify the proposed methods. The results show that the method can simultaneously identify the structural state, parameters of nonlinear high-rise buildings and the unknown seismic excitations.

Key words

High-rise building / Parameter identification；Load identification；Nonlinear system identification / Kalman filter / Sub-structural method

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QI Chengkai1，WU Jiamin1，HUANG Jinshan1，YANG Ning2,3. Parameters and unknown seismic excitations identification for nonlinear high-rise shear-type buildings using partial measurements[J]. Journal of Vibration and Shock, 2022, 41(24): 51-59

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