| Modern wood structure can be factory-precise production,with the advantages of green environmental protection,healthy and livable,structural safety,and high degree of assembly.Steel structure has the advantages of light weight and high strength,excellent seismic performance,fast construction speed and high degree of industrialization,and has become an important structural form of modern architecture.The cold-formed thin-walled steel-LVL（Laminated Veneer Lumber,referred to as LVL）shear wall combination structure proposed in this paper not only has the advantages of both steel and wood,but also conforms to the basic national policy of sustainable development and the development strategy of prefabricated buildings in China.In the composite structure,with steel as the frame and wood as the supplement,through experimental research,numerical simulation and theoretical analysis,the modeling method of the nonlinear finite element model of the cold-formed thin-walled steel-LVL shear wall combined structure is studied,and the collaborative working performance between the components in the combined structure is elaborated,and the damage evolution and development law of the combined structure is revealed.The research and development of this steel-wood composite structure has important theoretical significance and practical value for promoting the construction of ecological civilization in the construction industry,promoting energy conservation and emission reduction,realizing green construction,improving the transformation and upgrading of the construction industry and developing prefabricated buildings.The main contents and conclusions are as follows:（1）Material property test study:The material properties test of LVL was carried out,and the physical and mechanical properties of wood such as density,moisture content,elastic modulus and compressive strength of under pressure,stress-strain curve,strength and other physical and mechanical properties were studied.The test shows that the moisture content and density of LVL are in line with the requirements of relevant specifications,the failure mode is brittle destruction,the wood has better stress performance in the direction of the grain,and the performance of wood in the process of pulling is relatively stable,mostly in the linear elastic stage.（2）Nail connection node test and numerical simulation:First of all,the bending performance test of ordinary steel nails,twist nails and self-tapping screws was carried out,and the bending yield strength was measured to be 1087.29MPa,respectively.1871.71 MPa and 751.46MPa meet the specifications and relevant research requirements;in order to study the force performance of the nail connection,on the one hand,the unidirectional tensile test and finite element simulation of the two diffetent forms of nail connection nodes are carried out,and the results show that the nail nodes loaded perpendicular to the rubber layer have higher limit loads,but the ductility is poor,and the error between the simulated value and the test value is small,which is less than 5%.（3）Steel-wood high-strength bolted joint test study and numerical simulation:Experimental research and numerical analysis were carried out for three sets of steel-wood bolted joint specimens with different bolt diameters,and the failure mode,load-displacement curve,strain at the node and bolt slip were analyzed,and the results showed that the average yield load and limit load of the M12 bolted joint were 39.58kN and 41.66kN,respectively,which were greater than the M16 and M20 bolted joints.The error between the test and simulation results is less than 5%,which verifies the effectiveness of the finite element analysis model and lays the foundation for the establishment of a cold-formed thin-walled steel-LVL shear wall combined structural analysis model.（4）Analysis of the working synergy between the components of the cold-formed thin-walled steel-LVL shear wall combination structure:Establish a nonlinear analysis model of the cold-formed thin-walled steel-LVL shear wall,change the thickness,position,spacing and other factors of the filled wall bone to study the force performance of the cold-formed thin-walled steel-LVL shear wall under the monotonous horizontal load and the failure form,load displacement curve,hysteresis characteristics,limit displacement,resistance to lateral stiffness,energy consumption and other hysteresis properties of the shear wall under the action of low cycle repeated load.The working synergy between the components of the shear wall is revealed,and the results show that when the inner fill keel is arranged horizontally and the thickness is 60mm,the shear wall has good seismic performance,and the inner filled wood keel can make greater contributions to the anti-side and energy consumption performance of the cold-formed thin-walled steel-LVL shear wall;the nail node load-slip curve in the shear wall is fitted,and the calculation formula of the anti-side bearing force of the cold-formed thin-walled steel-LVL shear wall is given,and the theoretical value is compared with the simulated value. |
