Research On The Seismic Performance Of Fully Assembled Joints Between Square Steel Pipe Columns And H-shaped Steel Beams

The prefabricated steel structure building meets the development strategy of ’ building industrialization ’ and ’ green building ’ strongly advocated by China,and can better implement the ’ double carbon ’ goal in the construction field.Compared with traditional steel structure buildings,prefabricated steel structure buildings can well realize the standardization,scale and industrialization of construction and construction;at the same time,it is easier to meet the rapid development requirements of China ’s new housing industrialization.Therefore,based on the actual engineering construction requirements,this paper proposes a new type of fully assembled connection joint of square steel tube column-H steel beam suitable for low-rise steel structure buildings,and studies the seismic performance of the assembled joint.Through quasi-static test and numerical calculation,the failure mode of the new fully assembled joint of square steel tube column-H steel beam under low cyclic loading is observed,and the bearing capacity,deformation performance,ductility and energy dissipation performance of the joint under different axial compression ratios are studied.The main work is as follows :(1)Construction technology research and development of new fully assembled joints of square steel tube column-H steel beam.The construction characteristics of beam-column joints of layered assembled steel structure are summarized.Combined with the mechanical characteristics of low-rise steel structure buildings,a fully assembled connection joint suitable for square steel tube column-H-shaped steel beam is developed by cutting off steel tube column and connecting steel plate.According to the structural characteristics of the joint,the construction method of the fully assembled joint of square steel tube column-H steel beam is given.The experimental research scheme of seismic performance of new assembled joints is formulated.(2)Experimental study on seismic performance of new fully assembled joints of square steel tube column-H steel beam.Through the quasi-static test,the failure mode and hysteretic energy dissipation performance of the traditional welded joint and the new assembled joint of the square steel tube column-H steel beam under low cycle reciprocating action are compared and analyzed.Under different axial compression ratios,the quasi-static test was carried out on the new fully assembled joints of square steel tube column-H steel beam to study the ability of square steel tube column to withstand low-cycle reciprocating action under different axial forces.The deformation process and failure characteristics of the joint area under different forces were observed,and the variation rules of hysteresis curve,skeleton curve,joint stiffness,ductility and energy dissipation parameters with the change of service conditions were analyzed.(3)Finite element numerical calculation of new fully assembled joints of square steel tube column-H steel beam.According to the test results,the finite element model of the new layered fully assembled bolted joint and the traditional welded joint is established.The difference between the numerical calculation results and the actual test results is compared and analyzed,and the correctness of the numerical calculation model of the new fully assembled joint and the traditional fully welded joint is discussed.Through the finite element calculation model,the seismic performance of the new fully assembled joint and the traditional fully welded joint of the square steel tube column-H steel beam under different working conditions is numerically simulated,and the seismic performance of the new fully assembled joint is deeply studied.