Study On Seismic Performance Of Vertical Half Dovetail Tenon For Traditional Wooden Construction

In the rural areas of China,the wooden structure is still relatively popular,mainly because of its characteristics of human habitation and the undeveloped traffic in the remote mountainous areas,which can be built on the ground by local conditions.However,the farmhouses built by villagers are built on the basis of workers' experience,without specific manuals,and relatively backward in technology.Under the support of the national "12th Five-Year" science and technology support program "traditional agricultural building technology improvement and application demonstration"(2015BAL03B03),this paper has studied the nodes of the wooden structure farm house.The traditional wooden structure buildings can be passed down to the present,and the joints of the mortise and tenon joints play an important role in the structure.As semi-rigid nodes,it can bear certain bending moment and deformation,has good energy dissipation capacity and ductility,while traditional wood mortise and tenon joints are more commonly used dovetail tenon,tenon and semi permeable tenon and so on.Due to the shortcomings of traditional dovetail joint,such as weakening the cross section area of the column,and easy to pull out during the traditional mortise tenon earthquake,a vertical semi dovetail joint structure for beam column of timber structure is proposed,and its mechanical properties are verified through test.According to the test data of shaking table,the time history analysis program of building structure is programmed by Wilson-? method.The correctness of the program is verified by comparing the analysis results with the test results.In In this paper,the low cycle reciprocating test of the traditional mortise and tenon one-way joints and the new vertical semi dovetail joints is carried out respectively,and the comparison between the traditional one tenon and mortise one frame and the new vertical half dovetail tenon frame is carried out.The compressive strength,tensile strength and modulus of elasticity of wood are obtained through experiments,which provide the necessary basis for theoretical calculation and ABAQUS numerical analysis.Through the cyclic test study on unidirectional tenon joints and a wooden frame product model,get the tenon pull out capacity,failure mode and hysteretic curves model.The test results show that the model of damage occurred in all nodes,the traditional mortise joints to pullout failure,traditional dovetail tenon mouth tear node in Mao pullout failure,the vertical half dovetail tenon neck node to pull off and tenon amount of shear failure.Based on the analysis of traditional and new type vertical half mortise tenon joint dovetail joint hysteretic curve,skeleton curves,obtained by one-way joint test hysteretic curve is inverse S shape,a wooden frame model of hysteretic curve in the early stage of loading are almost coincident in approximate parallelogram,because central pinch effect seriously again,similar to the bow,with load and reciprocating cycle,the shape of the hysteresis loop is similar to the Z shape,pinching effect in all models of hysteresis loop is serious,but the pinching effect of vertical half dovetail joints pinch effect is lower than the traditional mortise tenon joint.Moreover,the new vertical half dovetail joint has better rotation moment,stiffness and energy dissipation capability than traditional straight tenon joints.Therefore,the new vertical half dovetail joint model can get better seismic performance than the traditional mortise and tenon joint model.