Experimental Study On Seismic Performance Of Prefabricated Glued Wood Frame Wall Panel Structure

Glulam wood structure is an important part of modern wood structure,it is different from traditional wood structure joints mortise and tenon joint,but through steel plate joint.The joints of steel plate connectors have the characteristics of superior energy consumption and good deformation performance.In the glulam frame-wall panel structure,although the wooden wall panel is regarded as a non-structural member,it actually bears a considerable part of the seismic effect,especially the cross laminated timber(CLT)wall panel has the advantages of large stiffness and high shear strength.With the promotion of prefabricated green building policy in recent years,prefabricated wood structure will have a good application prospect in the field of "cultural tourism and health care".At present,the research on glulam frame structure and CLT wall panel components mainly focus on the properties of glulam material,glulam frame node and component performance,glulam frame structure system,etc.,and the damage form and elastic lateral stiffness of glulam frame-wall panel structure and the cooperative working mechanism of the wall panel and the frame have not been studied in depth.Therefore,this article mainly conducts research work in the following aspects:(1)The quasi-static test study was carried out on 1 specimen of pure glulam frame structure and 4 specimens of glulam frame structure equipped with CLT wallboard.The design parameters include wall layout,CLT panel opening rate,CLT panel opening form,width and height ratio.Observation of the stress process and failure form of each structure through experiments,the load-displacement curve and skeleton curve of 5specimens were obtained,and the structure was subjected to stiffness degradation analysis,bearing capacity analysis,displacement ductility analysis and energy dissipation capacity analysis.Study the influence of selected design parameters on seismic performance of structures.The results show that the hysteresis loops of all specimens are inverted S-shaped;the skeleton curve of the pure frame structure is three-stage,and the structure skeleton curve of the CLT wall panel is four-stage;The existence of CLT wall panels improves the stiffness,bearing capacity and energy consumption capacity of the frame structure.(2)The anti-side theoretical analysis of the glulam frame-wall panel structure is carried out.Based on the principle of energy conservation and the deformation characteristics of the joints,the calculation formula of the elastic bending stiffness of the bolted steel-filled joints is derived and substituted into the calculation formula of the elastic lateral stiffness of the plywood frame.The calculation of the elastic stiffness of CLT wall panels divides the open wall panels into different wall segments according to the series-parallel method,and the rigidity of each wall segment is combined to obtain the elastic lateral stiffness of the entire wall.Finally,the elastic lateral stiffness of the glulam frame-wall panel structure is obtained through linear superposition.(3)The finite element model and simulation analysis of the glulam pure frame structure specimen and the glulam frame structure specimen with CLT wall panel were carried out.The results show that the simulated skeleton curve is in good agreement with the experimental measured curve,which verifies the correctness of the model.The CLT wall panel opening ratio,width and height ratio and wall panel opening location were selected as parameters to carry out a simulation analysis of the bearing capacity of this structure.The load-bearing capacity of the structure gradually increases with the decrease of the hole opening rate of the wall panel,and the increasing range becomes larger and larger,and the peak displacement gradually decreases.The width and height ratio of the structure has little effect on the bearing capacity of the structure.As the aspect ratio increases,the peak displacement of the structure gradually decreases.The opening position of the wallboard has a great influence on the bearing capacity of the structure.As the position of the hole moves toward the edge of the wallboard,the bearing capacity of the structure decreases more obviously.