Experimental Study On Seismic Performance Of The Self-tapping Screw Enhanced Light Wood Framed Shear Walls

The light wood structure is an overall system composed of standard timber with relatively small cross-sections and evenly densely connected.It is widely loved because of its advantages of safety,reliability,heat preservation and energy saving,flexible design,rapid construction,and low cost.The light wood structure shear wall is an important anti-lateral component of the light wood structure house.Under the action of horizontal load,the damage is serious,the bearing capacity is poor,and the stiffness and ductility are low.Therefore,a new wood structure shear wall is proposed in this paper.self-tapping screw reinforced light wood structure shear wall,that is,on the basis of traditional light wood structure shear wall,the bottom beam plate is connected by self-tapping screws with thread characteristics with side wall bone columns.In order to study self-tapping screws to strengthen the light wood structure shear wall,this paper carried out the following work.The lateral force resistance performance of light wood structure shear walls mainly depends on the mechanical performance of nail connection joints.In order to study the lateral force resistance performance of light wood structure shear walls under monotonic loading and low cycle reciprocating loading The skeleton nail joints connected by nails and self-tapping screws and the panel nail joints connected by ordinary round nails were subjected to monotonic loading and low-cycle reciprocating loading tests,and the failure modes and load-displacement curves of different types of nail joints were obtained.Under different loading conditions,different selftapping screw diameters,lengths,and different nail types affect the failure mode and lateral force resistance of nail joints.In addition,it provides a basis for the finite element simulation analysis of self-tapping screws to strengthen light wood structure shear walls.Basic parameters.In order to study the effects of different self-tapping screw diameters,lengths,and different nail types on the seismic performance of self-tapping screws reinforced light-weight woodstructure shear walls under different loading conditions,a group of two traditional light-weight wood-structure shear walls were fabricated.and 6 groups of 12 self-tapping screws to strengthen the light wood structure shear wall and carry out the monotonic loading and low-cycle reciprocating loading tests,and the failure form,shear strength,elastic lateral stiffness,ultimate displacement,ductility,and loss of the wall are obtained.can wait for parameters.The research shows that the shear strength and ultimate displacement of the self-tapping screw under lowcycle reciprocating loading are smaller than those under monotonic loading.For the shear wall using self-tapping screws,when the nail length is equal,its ductility coefficient increases with the increase of diameter,and the yield displacement decreases with the increase of diameter;when the diameter is equal,its ductility coefficient increases with The length of the nail increases,and the elastic lateral stiffness first increases and then decreases with the increase of the nail length.Compared with the traditional shear wall,the shear strength of the self-tapping screw reinforced light wood structure shear wall is increased by 8%,the elastic lateral stiffness is increased by 103%,the yield load is increased by 15%,and the ductility coefficient is the largest Increased by 74%,maximum energy consumption increased by 14%,ultimate displacement decreased by 2% to 18%,and yield displacement decreased by 31% to 52%.The improvement of elastic lateral stiffness and ductility helps to enhance the lateral performance of the light wood structure shear wall,and the reduction of yield displacement and ultimate displacement is conducive to reducing the degree of seismic damage of the structure.Therefore,the use of selftapping screws to connect the side wall studs The column and the bottom beam plate can be used as a new connection method of the light wood structure shear wall.Through the ABAQUS finite element analysis software,the self-tapping screw reinforced light wood structure shear wall is simulated and analyzed,and the failure mode and ultimate bearing capacity of the model and the test wall are compared to verify the accuracy of the model,and the stress cloud map output by the model is further analyzed The effects of the self-tapping screw diameter,nail length and skeleton nail type on the internal force distribution of the wall were investigated.