| The wood structure has the excellent performance of light weight and high strength,so it has the excellent seismic performance.However,the joints of modern wooden structures are usually generates slip and have significant semi-rigid characteristics during normal operation and failure,which also makes the lateral force resistance and failure mechanism of wooden structures,especially wooden frame structures,different from the current mainstream steel structures and concrete structures.At present,there are few researches on the related performance of wood frame system,which are not enough to guide the engineering design.Moreover,the characteristics of "strong member and weak joint" of wood frame system cannot meet the design principle of "strong joint and weak member" in seismic design.Therefore,it is necessary to study the lateral resistance system of wood frame and put forward some specific design suggestions.The wood frame joints are semi-rigid,so the lateral resistance stiffness and lateral resistance force of the frame usually need brace to meet the lateral performance of the joints.The bolted connection with slotted-in steel plates is characterized by high degree of prefabrication,convenient installation and clear path of force transmission,so it is often used as the connection node of wood structure.Because the mechanical properties of the joints usually determine the overall performance of the wooden structure,this paper conducts an experimental study on the bracing joints of bolted connection with slotted-in steel plates.The failure modes of the joints,the load-displacement curves and the hysteretic curves under the action of the monotone load and the reciprocating load are obtained through the axial loading test of 18 bolted connection with slotted-in steel plates under the action of the monotone load,and the relevant parameters of the joints’ mechanical properties are analyzed.The joint failure is mainly the tensile failure perpendicular to grain under the pressure and shear failure of A block of wood parallel to the grain,and the 10 mm diameter bolt has bent yield.Because the wood end distance and space between dowel do not meet the requirements,the wood brittle failure occurred at the bolt joints with 16 mm diameter.In order to enhance the performance of wood and delay the destruction of wood,the nodal test of tapping screw reinforced wood was carried out.In order to enhance the stiffness and bearing capacity of the joints,the joint with bearing plate is designed,and the joints show different mechanical properties under compression.Using ABAQUS,the finite element model of the support node is established.The calculation results are consistent with the experiment,and the accuracy of the model is verified.By means of finite element simulation,the layout of slotted-in steel plate is parameterized,and the effects of rope effect and manufacturing tolerance on the mechanical properties of joints are discussed.The FE analysis results show that the number of steel fillers and the thick-diameter ratio of the wood component with the influence of layout influence affect the yield mode of bolts,and the effect of bolt rope and the tolerance of fabrication have an influence on the joint performance to some extent.This paper compares and analyzes the calculation methods of the bolted connection with slotted-in steel plates bearing capacity proposed by various countries and scholars,and proposes a simplified method of the bolted connection with multiple slotted-in steel plates bearing capacity based on the calculation method of the bolted joint in China,and makes a comparative analysis based on the test and FE simulation results. |
