Seismic performance test and resilience model of full size dovetail joint considering deformation damage
In order to study the effect of internal deformation damage on the seismic performance of dovetail joint,three groups of full-size larch dovetail joints,with 0％,15％and 30％tenon reduction,were fabricated.Vertical quasi-static test and acoustic emission test were carried out to analyze the hysteresis and skeleton curves of each joint and the pulled out amount of each joint.According to the measured AE parameters,the deformation damage mode and damage evolution equation of each stage of the joints were analyzed.And the influence of deformation damage on the restoring model of joints was also studied.The results show that with the increase of the rotation,the bending moment of the joint first increases and then decreases,the bearing capacity decreases,the amount of tenon pulling increases and the stiffness of the joint gradually decreases.The loading process can be divided into slight damage stage,medium damage stage and severe damage stage according to the hysteretic curve characteristics.At the stage of slight damage,tensile damage dominates,and when entering the stage of moderate damage and severe damage,shear damage of specimens increased obviously,and the damage level of each joint increases with the increase of the relative stress ratio.The restoring model of the joint in mild and moderate damage stages is elastic-yield model.The restoring model of the joint in severe damage stage is slip-restoring model.The yield stiffness of the joints with different weakening degrees is 52.76％,35.36％and 69.79％of the elastic stiffness,and the recovery stiffness is 41.42％,62.14％and 34.58％of the elastic stiffness,respectively.With the increase of the degree of loosening,the angle ductility coefficient increases,the shear damage appears earlier,and the joint stiffness decreases obviously under the same damage level.
ancient timber structuresfull-size dovetail-tenon jointquasi-static testhysteretic behaviorresilience modeldeformation damage
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