Study On The Replaceable Property Of Steel Continuous Beam After Earthquake

Architectural seismic resiliency is an important research direction in the field of earthquake engineering.Aim at the beams of high-rise shear wall structure,this thesis put forward three kinds of replaceable steel beams which can be prefabricated connected,and completed its structural design method,and studied its replacement properties,mechanical properties and seismic performance.The main work is as follows:Firstly,the section design of energy dissipation beam and non-energy dissipation beam as well as the connection part design of extremely short shear yield couplings are carried out.And three pure prefabricated connection modes of bolt-group connection,end plate connection and end plate-shear key connection are proposed,which improves the design method of replaceable couplings.In order to simulate the coupled shear wall structure and made it mainly fails on shear force,the shear loading test device and loading system for connecting beam is designed,which is convenient for subsequent test and research.Secondly,the replacement performance test of replaceable steel beam after earthquake is carried out,and the evaluation method of replacement performance combining test and simulation is proposed to reduce the consumption of manpower and material resources.By comparing the test results and simulation results of three replaceable steel beam specimens with different connection modes,the replacement performance and technical key points of the specimens with different connection modes are analyzed,and the structural design and replacement suggestions are given.Thirdly,static loading tests were carried out on the replaceable steel girder specimens to analyze the development rules of stress and deformation,and compare the mechanical properties of specimens with different connecting modes.The detailed finite element model of the specimen was established to simulate the static loading process of the specimen,and the bearing capacity,deformation capacity and failure mode of the specimen were analyzed.The feasibility of the finite element simulation method was verified by comparing the test results with the simulation results,so as to provide reference for further research.Fourthly,on the basis of static simulation of the coupling beam finite element,the optimal change of performance and static performance specimen model is carried out quasi static loading simulation,to analyze its seismic performance under low frequency cyclic loading.The hysteretic energy dissipation of the energy dissipation beam curve,and the law of skeleton curve,stiffness degradation,ductility coefficient and energy dissipation coefficient is plotted to evaluate performance indicators,such as analysis of the seismic performance of the specimens,for subsequent provide theoretical basis for the structural optimization and research applications.