Study On Seismic Behavior Of Prestressed Bolt Joints With Slotted-in Steel Plate In Glulam Wood Structure

In recent years,with the promotion of prefabricated buildings and the practical application of wood structure buildings,the design of wood structure joints has attracted more and more attention.Steel filled plate bolted joint has the advantages of clear force transmission path and easy construction,which is a widely used beam column connection method.However,the ductility coefficient and energy dissipation capacity of the joints are not enough,which can not give full play to the mechanical properties of materials.Therefore,it is necessary to improve the joint to give full play to the material performance and obtain better seismic performance.According to the comparison of various strengthening methods of Glulam beams,the external prestressing tendons are applied to the joints to obtain better seismic performance.The low cycle cyclic loading tests including 6 working conditions are designed to study the seismic performance of the joints.By comparing the seismic performance of ordinary steel filled plate bolted joints and prestressed steel filled plate bolted joints,the improvement of the seismic performance of joints by applying prestressing force is studied;by comparing the seismic performance of prestressed steel filled plate bolted joints with different number of prestressing tendons and prestress values,the influence on the seismic performance of the joints is determined.The results show that:the seismic performance of the joint can be improved by applying external prestressing force.When the number of prestressed steel bars is 4 and the prestress value is 20 kN,the bearing capacity of the joint is relatively high,and seismic behavior is relatively good.Using ABAQUS finite element analysis software,the same finite element model as the test node is established for numerical simulation.After verifying that the finite element analysis results are consistent with the test results,the influence of four parameters,such as the number of prestressed reinforcement,the size of prestressed value,the bolt edge distance and the bolt diameter on the seismic performance of the joint is studied.The results show that:the number of prestressed reinforcement,bolt edge distance,the number of prestressed reinforcement has a relatively large impact on the seismic performance of the joint.The more the number of prestressed reinforcement,the larger the diameter of bolt and the smaller the edge distance of bolt,the greater the bearing capacity of the joint;the bearing capacity of the joint increases first and then decreases with the increase of the prestress value;the number of prestressed reinforcement is 4,the prestress value is 20kN,and the bolt diameter is When the bolt side distance is 30 mm and 10 mm,the seismic performance of the joint is good.