Research On Seismic And Dissipated Performance Of Cast-in-situ Mega Frame And Prefabricated Secondary Frame Structure

At present,the assembled reinforced concrete structure is designed and constructed according to the design method and evaluation index of the cast-in-situ reinforced concrete structure.The seismic performance requirement is close to or reach the level of the cast-in-situ reinforced concrete structure.However,in the high intensity area of the earthquake,assembly operations and connection anchorage is difficult.The energy dissipation technology can reduce the structural requirements of the structural parts of the seismic high-intensity area by concentrating the seismic energy and reducing the ductility requirements of other structural components.Therefore,this paper proposes a cast-in-situ mega frame and prefabricated reinforced concrete secondary frame structure system with assembled energy dissipation hinge connect the main frame and the secondary frame,which concentrates the seismic energy,and reduces the ductility requirement of the secondary frame components.The mega buckling restraint is used to enhance the lateral stiffness and energy dissipation capacity of the whole structure to protect the seismic safety of the secondary frame.The research is shown in details as follows:(1)The elastic-plastic dynamic time history analysis of the reinforced concrete mega frame structure is carried out to analyze the transmission and energy dissipation of the main frame and secondary frame,the yield order of the structural members and the ductility requirements.(2)This paper proposes a mega frame structure system based on energy dissipation hinge.The secondary frame beams and the main frame columns are connected by hinges with assemblable and reciprocating bending energy.The energy dissipation distribution and secondary frame damage degree of the structural system are studied.The parametric analysis of the energy dissipation hinge is given,and the design idea of the mega frame structure system based on the energy dissipation hinge is given.(3)The mega frame structure based on mega buckling restraint is proposed to connect the giant column with mega buckling restraint,and the lateral stiffness of the mega frame is improved.At the same time,the seismic energy of the mega frame is used to reduce the seismic energy and the mega buckling restraint control effect of layout on the seismic damage of main and secondary frame is studied.