上海某超限高层悬挂结构罕遇地震下的动力弹塑性分析及抗震性能评估

Dynamic Elastoplastic Analysis and Seismic Performance Evaluation of Super High-Rise Suspension Building Under Rare Earthquake in Shanghai

本工程结构高度58.5m,采用钢筋混凝土核心筒-带斜撑和环带桁架支承钢框架结构体系。根据实际情况,模拟建立了所有对结构刚度有贡献的结构构件组成的三维模型。动力弹塑性分析结果表明,在抗震设防裂度7度罕遇地震作用下,结构最大层间位移角小于规范限值。核心筒角部钢管混凝土柱最先出现塑性转角,但并未开展,始终处于B^IO阶段,钢框架、悬臂桁架和环带桁架均未出现塑性铰。核心筒连梁较早出现受压损伤,起到了耗能作用。本结构在罕遇地震作用下的受力性能良好。

The reinforced concrete core with brace and circumferential truss supporting steel frame system is adopted for this project with a structural height of 58.5 m. According to the actual situation, a three-dimensional model of all structural components contributing to structural stiffness was set up. The results of dynamic elastoplastic analysis show that under 7 degree rare earthquake, the maximum drift meets code requirements. Plastic hinge appears first in the concrete filled steel tubular column of core corner, but it was not developing, and it remains in the B^IO stage. And the plastic hinge was not appeared in the steel frame, cantilever truss and circumferential truss. Link beam of concrete core has early compression damage and plays an energy dissipation role. This structure has good mechanical performance under the rare earthquake.