模块化装配式斜支撑节点钢框架结构整体稳定性能研究
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摘要
为了获得模块化装配式斜支撑节点钢框架结构体系的受力性能和设计方法,采用有限元分析方法,考虑结构整体对核心模块新型斜支撑柱的约束作用,在结构整体中研究斜支撑柱的承载能力,通过极限承载力反推得到了斜支撑柱的计算长度系数,解决了该结构体系设计的关键问题.进行了30层结构的整体有限元分析,获得该结构体系在水平荷载超载、竖向荷载超载及二者同时超载下的极限承载力、破坏模式和机理,该体系的破坏模式符合强柱弱梁的抗震原则.研究结果表明:该结构体系侧向刚度较大,但延性较差,在水平和竖向荷载作用下极限承载力系数取2.0较合理,承载力具有足够的安全储备.
To get the load-bearing behaviors and design methods of a modularized prefabricated steel structure with lean-brace joints,the finite element analysis method was adopted,the restraints effect of the whole structure of the lean-brace column was considered,the load-bearing capacity of lean-brace column was studied in the integral structure,the calculated length coefficient of the column was conversely derived by the ultimate load-bearing capacity,which solved the key problem in design of the structure system.The integral finite element analysis of a 30-layer structure was performed,the loadbearing capacity,the failure mode and failure mechanism of the new-type structure under overload horizontal load,overload vertical load and overload were obtained.The failure mode of the system was in accordance with the seismic principle of "strong column weak beam".Analysis shows that the structure has better lateral stiffness,but poorer ductility.It is reasonable to control the ultimate load-bearing capacity coefficient to 2.0 under horizontal load and vertical load,which has enough safety margin.
To get the load-bearing behaviors and design methods of a modularized prefabricated steel structure with lean-brace joints,the finite element analysis method was adopted,the restraints effect of the whole structure of the lean-brace column was considered,the load-bearing capacity of lean-brace column was studied in the integral structure,the calculated length coefficient of the column was conversely derived by the ultimate load-bearing capacity,which solved the key problem in design of the structure system.The integral finite element analysis of a 30-layer structure was performed,the loadbearing capacity,the failure mode and failure mechanism of the new-type structure under overload horizontal load,overload vertical load and overload were obtained.The failure mode of the system was in accordance with the seismic principle of "strong column weak beam".Analysis shows that the structure has better lateral stiffness,but poorer ductility.It is reasonable to control the ultimate load-bearing capacity coefficient to 2.0 under horizontal load and vertical load,which has enough safety margin.
引文
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