| Compared with the ordinary steel,the high strength steel has higher yield strength and tensile strength,but it also has obvious defects.With the improvement of the strength of the steel,the length of the yield platform is shortened and the yield ratio is improved.The end-plate connection is commonly used in steel structure of the node connection,the connection method has advantages of quick in construction,quality,bearing performance,good seismic performance,economic and so on.The use of high-strength steel can effectively reduce the cost,the size of components,the weight of the structure,the amount of welding operations,and materials.It is environment-friendly recyclable,what’more this high strength steel whose engineering application prospects are very broad is the development of circular economy,green building one of the main ways.The existing design specifications are based on the experimental research and calculation results of ordinary low carbon steel components,and the high-strength steel end-plate connection nodes are not supported by sufficient basic research results.Therefore,the seismic performance of Q690 high-strength steel end-plate connection nodes is studied,which not only has theoretical significance,but also has reference value for engineering practice.In this paper,the finite element simulation and theoretical calculation of the way to semi-rigid end-plate connection node system analysis.In order to clarify the seismic performance of Q690 high-strength steel end-plate connection joints,this paper uses ABAQUS finite element method to verify the simulation results,and the simulation results are compared with the test results to ensure the accuracy of the simulation.Based on the finite element method,the finite element analysis of the finite element model under cyclic loading is carried out.The initial rotational stiffness,ultimate bearing capacity and hysteresis performance are discussed.Influential factors of seismic performance of high strength steel end-plate connection.The results show that the main factors influencing the bearing capacity of the joints are: the diameter of the high strength bolts,the strength of the end plates,the strength of the end plates and the thickness of the end plates.Theinfluence of the bolt diameter is the most obvious.When the bolt diameter increases from M20 to M30,the bearing capacity of the specimen is increased by 56.42%.The main factors that affect the initial stiffness of the joint are the thickness of the end plate,the diameter of the bolt,and whether to to set the column web stiffener.The specimen with the stiffened ribs under the same conditions is 34% higher than the initial initial stiffness.When the cyclic displacement is the same,the stiffness of the joint increases with the bolt strength grade,bolt diameter,end plate thickness,end plate strength grade and end plate stiffening ribs,column web stiffener settings increased.According to the Eurodode3,the initial rotational stiffness and the bending bearing capacity in the design of the beam-to-column joint of the high-strength steel is calculated by the component method,the equivalent T-piece method respectively and the bending moment-angle curve to fit.The results show that the system of the node system is systematically studied by finite element simulation and theoretical combination.The results and conclusions of this paper are as follows: it is shown that the EC3 specification predicts the flexural bearing capacity of the high-strength steel end-plate connection joints,and the formula can be used to connect the end-plate connection nodes of high strength steel.The EC3 component method overestimates the initial rotational stiffness of the node,and its prediction accuracy needs to be improved.Therefore,it is necessary to further correct the high strength steel end-plate connection node. |
PDF Full Text Request