Seismic damage analysis and identification&nbsp; for the stiffness of ancient timber buildings mortisetenon joints

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (6) : 47-54.

Seismic damage analysis and identification for the stiffness of ancient timber buildings mortisetenon joints

XUE Jianyang ,BAI Fuyu,ZHANG Xicheng ,SUI Yan,ZHOU Chaofeng

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Abstract

Based on the shaking table test of a singlebay ancient timber frame with a scale ratio 1∶3.52, the damage rules for the initial stiffness and yield stiffness of mortisetenon were obtained under cumulative earthquake action. The structural simplified mechanics model was established, the relationship between the stiffness of the structure and the stiffness of the mortise joint was established by means of the static and dynamic cohesion method, and the structural state equation and observation equation were deduced. The responses of displacement, velocity and acceleration were obtained by the force hammer percussion test and simulation calculation. Considering the 5% noise disturbance in the laboratory environment, the damage identification was carried out by the least squares method and the extended Kalman filter method. Based on the identification results, the damage values of the initial stiffness and yield stiffness were calculated. The results show that the initial stiffness damage of mortisetenon joints increases first and then decreases, the yield stiffness damage is straightly increased, and the hybrid algorithm has higher precision for identifying the initial stiffness and yield stiffness.

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ancient timber building / mortise-tenon joint / static and dynamic cohesion / seismic damage / stiffness identification

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XUE Jianyang,BAI Fuyu,ZHANG Xicheng,SUI Yan,ZHOU Chaofeng. Seismic damage analysis and identification for the stiffness of ancient timber buildings mortisetenon joints[J]. Journal of Vibration and Shock, 2018, 37(6): 47-54

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