孝感市民之家大跨悬挑结构设计

Large-span cantilever structure design for Xiaogan Citizens' Home

孝感市民之家采用由钢桁架组成的钢-混凝土混合结构体系,从3层楼面开始四面悬挑。在满足建筑功能的前提下,对多种结构方案进行了承载能力和位移比选,得到了较优的结构体系。采用性能化方法对该结构进行设计,并对悬挑构件的支撑系统进行了中震弹性分析,满足中震弹性、大震不屈服要求;利用MIDAS Gen软件对结构进行静力弹塑性分析,以了解结构在大震作用下的性能,保证结构实现多道抗震防线要求;为防止悬挑结构出现连续倒塌,采用SAP2000软件模拟悬挑杆件失效,进行了抗连续倒塌分析;对楼面大开洞采取了有针对性的加强构造措施。

Xiaogan Citizens' Home project adopts concrete-steel hybrid structural system with steel trusses. The structure has cantilever on four sides of the building starting from the third level. On conditions of suiting architectural functions,an optimal structural system was selected through bearing capacity and displacement comparisons among various scenarios.Performance-based seismic design method was used to design and bracing systems of the cantilever substructure were elastically analyzed under the precautionary earthquake to conclude that the system fulfilled requirements of keeping elastic under the precautionary earthquake and keeping unyielding under the rare earthquake. Software MIDAS Gen was adopted to carry out Pushover analysis to master the structural performance under the rare earthquake and assure the multiple seismic fortification lines. For avoiding progressive collapse of the cantilever structure,failure of cantilever elements was simulated by software SAP2000 and progressive collapse analyses were conducted. Large opening in floor was strengthened with corresponding structural details.