Seismic performance test and restoring force model of full-scale penetrated-tenon joints considering fracture damage
To study the influence of fracture damage on the seismic performance and restoring force model of penetrated-tenon joints,quasi-static tests were carried out on three full-scale models of hemlock penetrated-tenon joints.The critical load and critical energy release rate of joints were determined by acoustic emission tests.The fracture damage mode and hysteretic performance of joints were analyzed,and the restoring force model of joints considering fracture damage effect was proposed.The results show that the failure of the penetrated-tenon joint under reciprocating load is the local fracture of variable cross-section and tenon neck.The local fracture modes of variable cross-section are RL,LT and RT,and the local fracture modes of tenon neck are LT and RT.The degree of loosening has a great influence on the energy release rate of the joint under negative loading,and the maximum difference of the negative energy release rate is 217.48kN/mm.The amount of tenon pullout decreases with the increase of loosening degree.The amount of tenon pullout under positive loading decreases by 33.72％at most,and the amount of tenon pullout under negative loading decreases by 35.53％at most.Before the penetration of variable cross-section cracks,with the increase of joint loosening,the initial slip of positive and negative loading increases,the elastic stiffness decreases,but the yielding stiffness changes little.After cracking of the cross section of tenon neck,with the increase of the joint loosening,the positive loading stiffness decreases,while the negative loading stiffness does not change much.
ancient timber structuresfull-scale penetrated-tenon jointsacoustic emissionfracture damageseismic performancerestoring force model
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