Seismic Performance Analysis Of Fully Assembled Steel Modular Frame-tube Structure System

With the rapid development of China’s economy,the process of urbanization is also continuously promoted.At the same time,China needs to build a large number of urban dwellings to meet the needs of the rural population transferred to the city.Traditional construction methods are difficult to meet the requirements of the new era,so the country is vigorously promoting the industrialization of construction.Modular buildings have many advantages such as fast construction speed,controllable quality,and environmental protection.They are in line with the development needs of China’s urbanization,and they have attracted more and more attention from the society.In recent years,modular buildings have gradually developed into high-rise buildings.However,most of the current high-rise modular buildings adopt the structural form of a combination of a concrete cast-in-place core tube and a modular outer frame.It has significant defects such as limited construction speed and poor integrity.In order to solve the problems encountered in the high-rise modular buildings,this paper proposed a fully assembled steel modular frame-tube structure system,and researched on its seismic performance.A fully assembled steel modular frame-tube structure system was proposed and its feasibility was verified.The system used the on-site assembly buckling-resistant steel plate shear walls to form the core tube,and then connected the modular frame with the connecting beam and connecting floor to form an integrated frame-tube structure.A 30-story high-rise modular building was designed using this structural system with reference to an engineering example.A model was built and calculated in ETABS based on two modular beam assumptions.The fully assembled steel modular frame-tube structure system proposed in this paper has good assemblability.Through numerical simulation calculation results,it is concluded that the combined connection of reinforced modular beams can make it have better seismic and vibration damping performance.It has theoretical and practical significance for improving the prefabricated assembly efficiency and seismic performance of prefabricated buildings.Aiming at the overall performance requirements of the connecting beam and connecting floor of this structure,a new form and construction method of connecting beam and connecting floor were proposed.The numerical simulations were used to analyze the basic mechanical properties and seismic performance of the connecting beams and connecting floor.The static and dynamic performances of connecting beams and ordinary beams were co MPared by ABAQUS,and the influence of factors such as the position of joints and the distribution of pads on their mechanical properties were studied.For different floor slabs,four connecting floor slab models are designed,and the modal analysis,response spectrum analysis,and Pushover analysis were performed for each model.Finally,it is concluded that the connecting beam and connecting floor structure proposed in this paper is feasible,and strengthening the connecting floor can effectively improve the overall stiffness of the structure,control lateral displacement,and delay the collapse of the structure in earthquake.