Static And Dynamic Model Of Mortise Joints For Chinese Traditional Structure

There are large number of traditional wood structures in China.These wooden structures are divide into historic buildings and traditional residence,and current design and reinforcement code of these buildings are mostly conceptual.The earthquake responses of traditional wooden structure are depend on semi-rigid characteristics of mortise-tenon joints,which affected by embedment and friction property of wood.In previous studies,our research group has achieved many results on embedment and friction property of wood,this paper will establish the static and dynamic model of traditional wood joints.With reasonable assumptions,the bending moment resistance of a mortise-tenon is divided into two major parts-embedment pressure and friction.The moment rotation relationship of mortise-tenon joints under monotonic loading was derived using of wood embedment theory,including straight tenon,half-length tenon and through tenon with stairs.Parameters which characterize the stiffness degradation,strength degradation and pinching effect of wood joint are obtained through cyclic-loading test of straight mortise-tenon joints.The numerical simulation of a plane wood frame under cyclic loading is carried out,and hysteretic relationship of base shear and top displacement is obtained.The shaking table test of traditional wood structure model was designed and carried out,and the corresponding three dimensional numerical model was established for nonlinear dynamic time history analysis.Above research result indicates that the moment rotation hysteresis model can simulate stiffness degradation,strength degradation and pinching characteristics of wooden joints and wooden frame.Calibrated moment rotation hysteresis models can be used for static and dynamic analysis of the traditional wooden structure.