Study On Lateral Behavior Of Steel Frame Structures With Fully Bolted Joints In Modular Buildings

Building industrialization is the inevitable trend of the future development of the construction industry.Developing green buildings is the active advocacy of the Chinese government.Energy saving,environmental protection and high efficiency are the exclusive labels of the rapid development of assembly building mode.Assembly building is a mode of building industrialization;Modular building is an upgrade of assembly building and the forefront of building development,relative to assembly building.The prefabricated proportion of building components in modular buildings is higher and their advantages are more prominent.At present,modular buildings in most countries are only suitable for low-rise buildings,while modular buildings in our country are only suitable for 4-8 storeys.The only breakthrough in the application of high-rise buildings is the sixth generation modular technology of Australia-Sicorigo,which is in the forefront of modular technology.Therefore,if modular buildings are to be widely used in high-rise buildings,some technical difficulties need to be solved urgently and studied continuously.Building block modular unit is the basic unit of modular building assembly,and its stability is an important factor affecting the overall stability of modular building.The research content of this paper is to make modular building into zero,and take the advanced modular building technology-Sicorigo modular building unit as the research object to study the lateral resistance of modular units.In this paper,rigid and semi-rigid modular units are established by finite element software,and the mechanical properties of different modular units are studied by changing the axial compression ratio,and the internal force distribution is also studied.Then,by changing the stiffness ratio between corner column and mid-column joints of semi-rigid modular elements,the change of internal force distribution is studied.Finally,a new eccentric brace is designed to improve the lateral resistance of modular elements,and two anti-buckling measures are added.Under the same axial compression ratio,the mechanical properties of each supporting modular element are compared.The results show that the semi-rigid modular element has better ductile deformation capacity and energy dissipation capacity than the rigid modular element under different axial compression ratios;the semi-rigid joint can redistribute the internal force of the modular element,and the effect of the internal force distribution can be adjusted by changing the stiffness ratio between the corner node and the middle node;the ductility of the modular element can be improved by the new eccentric support.In the new eccentric bracing,the bracing buckling can be delayed by adding sleeve in the middle of square pipe or H-section steel with ribbed plate,which can improve the energy dissipation capacity of the modular element,and the effect of adding sleeve is the most effective.