邯郸文化艺术中心基于性能的抗震设计

Performance based seismic design on Handan Culture & Arts Center

邯郸文化艺术中心包括博物馆、大剧院、城规馆和图书馆,采用钢筋混凝土框架-剪力墙结构与钢结构的混合结构。博物馆和图书馆利用多层结构高度形成巨型悬挑钢桁架,将部分楼层整体悬挑。外围钢桁架为空间曲面,结构形式复杂。大剧院上方的椭球形顶盖采用双向正交钢管桁架体系形成双层网壳结构。壳体平面尺寸为108m×85m,高度为22.5m。结构内部空旷,楼板开洞较大,楼板标高复杂,造成楼板不连续。结构刚度分布不均匀。巨型悬挑钢桁架和转换结构造成抗侧力构件竖向不连续。整体结构属于复杂超限工程。针对结构特点,采用基于性能的设计方法,对重点部位制定了性能目标。采取了加厚楼板、设置楼板暗撑、加强墙体约束等抗震加强措施。采用多种程序分析了结构在不同地震水准作用下的弹性或弹塑性响应。补充了楼板应力分析、重要剪力墙应力分析、钢结构稳定分析、防止连续倒塌分析、壳体单独模型分析等。结果表明,结构能够实现设计性能目标,具有良好的抗震性能。

Handan Culture Arts Center includes a museum,an opera house,an urban planning museum and a library.The main structure is hybrid with reinforced concrete frame-shear wall and steel structure.Some floors of the museum and library are cantilevered by multi-story height steel truss.The external surface is spatial steel truss and has a complex structure.Ellipsoidal roof of the opera house is a double layer latticed shell structure formed with two-way orthogonal steel truss system.The plane size of the shell is 108m×85m,and its height is 22.5m.The structure is complex and beyond the scope of design codes.The performance-based design method was used in seismic design.Specific performance objectives were developed for important structure elements.Some details of seismic design were adopted,such as thickening the floor,setting floor brace and strengthening the wall constraints.Several programs were used to analyze the elastic and plastic response of structure under earthquake of different levels.Some specialized analyses were supplemented,including stress analysis of large opening floors and important shear walls,stability analysis and progressive collapse analysis of steel structures,and independent shell model analysis.The results show that the performance objectives are achieved and the seismic performance of the structure is good.