Experimental Study on Seismic Performance of Irregular Mortise-and-Tenon Joints in Damaged Ancient Architectural Wood Structures
To investigate the mechanical properties of asymmetric mortise-tenon joints in ancient wooden structures,four full-scale mortise-tenon joints were designed.This included one intact joint and three joints with varying levels of damage.Moment-rotation hys-teretic curves were obtained for the mortise and tenon joints under low cyclic reversed loading tests.The hysteretic characteristics,skel-eton curve,energy dissipation capacity,and stiffness degradation were analyzed.The experimental results indicate that the shape of the hysteretic curve changes from an"S"shape to an inverted"Z"shape as the level of damage increases,with the pinching effect becom-ing more pronounced.The ultimate bending moment and rotational stiffness of the damaged mortise and tenon joints are less than those of the intact joints,while the ultimate rotation capacity of the damaged joints is greater.As the looseness of the joints increases,the ulti-mate bending moment,peak rotational stiffness,and hysteretic energy decrease gradually.Under the same load displacement level,the hysteretic energy and stiffness of the intact joint are significantly higher than those of the damaged joints.A positive and negative stiff-ness theory formula was derived,providing a theoretical basis for engineering applications.
Ancient wooden structureMortise and tenon joint nodesDegree of loosenessSeismic property
万方数据
维普
