天津博物馆结构设计与研究

新建的天津博物馆建筑面积达55 000m2。因内部大空间的需要,楼层平面凹凸不规则、楼板不连续。由于立面造型的需要,屋盖四周设有大悬挑桁架结构,最大出挑15m,并下挂层4,5楼板,不仅造成结构竖向质量分布不均匀,还使楼盖的转动惯量增大。针对以上超限情况,采用抗震性能优良的钢框架-支撑结构体系,利用楼、电梯位置尽可能设置对称的钢支撑框架,提高结构抵抗扭转效应的能力。采用多种有限元软件进行分析,并根据性能化设计要求提出主要抗震措施,以确保大跨度悬挑结构的安全。

Structural design and research on Tianjin Museum

The newly built Tianjin Museum has a total floor area of 55 000m2.In order to meet the requirement of large interior space,the floors are designed to be irregular and discontinuous.As the need for elevation modeling,some trusses with large cantilever span are set around the roof.The maximum cantilever span of the trusses is up to 15m and there are one to two floors hanging on it.Therefore,the vertical mass distribution of the structure is not regular and the floor inertia moment is great.Based on the above situation,steel frame-brace system with excellent seismic performance is adopted.Some steel braces are set utilizing the places of staircases and elevator halls to strengthen the anti-reverse capacity of the structure.The structure was analyzed by several FEM analysis programs,and some main structural measures were described,which obtained from performance-based design to ensure the safty of the large span cantilever structure.