某超限复杂高层建筑结构动力弹塑性分析

Structural dynamic elastoplastic analysis of an over-limit complex high-rise building

某冰雪世界建筑由3部分组成:南侧为精品酒店,北侧为温泉娱乐,而冰雪世界和滑雪场则支撑于温泉娱乐、精品酒店和落地支撑桁架柱之上。结构同时存在高层、大跨钢屋盖、落地斜支撑和悬挑桁架,属于超限高层结构。采用ABAQUS对结构进行8度罕遇地震作用下的动力弹塑性分析,分析中考虑了几何非线性、材料非线性以及施工过程非线性模拟。研究结果表明:在罕遇地震作用下,南北侧高层结构最大层间位移角未超过1/100的限值要求,屋盖钢结构的位移角未超过1/50限值要求。弹塑性分析时结构出现损伤,刚度降低,基底剪力减小;大部分剪力墙受压损伤较小,对受压损伤明显的地方建议采取措施加强;大部分连梁破坏,起到了耗能的作用。上部屋盖钢结构和落地支撑桁架塑性应变较小,大部分处于弹性工作状态。结构满足大震不倒的抗震性能要求。

An Ice World structure is composed of three parts: boutique hotel on the south side,hot spring entertainment on the north side,big roof of the ice world and ski resort supported on the hot spring entertainment,boutique hotel and the landing support truss column grid. The structure which has high rising building,long span steel roof,support truss column and cantilever truss,is an over-limit high-rise structure. ABAQUS is adopted to analyze the dynamic elastoplasticity of the structure under 8 degree rare earthquake. Geometric nonlinearity,material nonlinearity and nonlinear simulation of construction proces are considered in the analysis. The results show that under the action of rare earthquake,the maximum interstory drift ratio of the high-rise structure on the north and south sides does not exceed the limit of 1/100,and the maximum interstory drift ratio of the steel structure on the roof is less than the limit of 1/50. In the elasto-plastic analysis,the structure is damaged,the stiffness and base shear force of the structure decrease. Most shear walls have less compression damage,and it is suggested to take measures to strengthen the locations where the compression damages are obvious. Most of the damaged coupling beams play a role in energy dissipation. The steel structure of upper roof and landing support truss have small plastic strain and most of them are in elastic working state. The structure can meet the seismic performance requirements of no collapse under rare earthquake.