李自健美术馆钢结构基于性能的抗震设计

Performance-based Seismic Design of Steel Structure of Li Zijian Art Museum

李自健美术馆采用巨型框架-支撑钢结构体系,圆环工作室以3个巨型柱悬挑的17榀主桁架为受力骨架,主桁架通过内、外环桁架连系为一个整体,环向最大跨度44.6 m。采用基于性能的抗震设计方法,提出适合该工程实际情况的抗震性能目标和不同构件的抗震性能设计指标。对结构进行小震弹性、中震弹性和中震不屈服验算,以及大震作用下的弹塑性分析。结果表明,仅支撑和巨型柱柱底出现塑性铰,数量不多,塑性发展不大。结构整体抗震性能良好,关键构件的抗震性能指标满足预设的性能要求。

Li Zijian Art Museum is a mega-steel-structure with mega-frames and braces. A ring atelier is supported by 17 main trusses suspended by 3 mega-columns. The main trusses are connected as a whole by an inside ring truss and an outside ring truss. The largest span along the ring atelier is 44.6 meters. Based on the pefformance-based design method, the pefformance objectives and design specifications of key components are proposed. Performances of the structure are verified under different levels, including elastic analysis under frequent earthquake, unyielding verification and elastic analyses under medium earthquake and elasto-plastic analysis under rare earthquake. The results show that a few plastic hinges fomled in some braces and the first layer of the mega-columns. Good seismic behavior performed and seismic indices of key components can satisfy the predefined pefformance requirements.