巨型支撑框架—核心筒超高层建筑的地震倒塌模拟

研究超高层建筑的地震倒塌模拟有很重要的现实意义。尽管在高烈度地震区巨型支撑框架-核心筒超高层建筑是高层结构体系中比较常见的一种,但却很少研究这种建筑在地震突发事件中的失效模式和倒塌机制。研究在中国高危地震带建造的巨型支撑框架-核心筒超高层建筑(H=550m)在最大0.9g(g为重力加速度)谱加速度下的倒塌行为。根据纤维梁模型和多层壳模型建立有限元模型。分析这种建筑的动态特性并进行地震倒塌模拟。最后,详细地探讨其在地震倒塌中的失效模式和机理。此研究可作为类似的超高层建筑抗倒塌设计的参考。

Earthquake-Induced Collapse Simulation of a Super-Tall Mega-Braced Frame-Core Tube Building

Research on earthquake-induced collapse simulation has a great practical significance for super-tall buildings.Although mega-braced frame-core tube buildings are one of the common high-rise structural systems in high seismic intensity regions , the failure mode and collapse mechanism of such a building under earthquake events are rarely studied.This paper thus aims to investigate the collapse behavior of a super-tall mega-braced frame-core tube building ( H =550m ) to be built in China in the high risk seismic zone with the maximum spectral acceleration of 0.9 g ( g represents the gravity acceleration ) .A finite element ( FE ) model of this building is constructed based on the fiberbeam and multi-layer shell models.The dynamic characteristics of the building are analyzed and the earthquake-induced collapse simulation is performed.Finally , the failure mode and mechanism of earthquake-induced collapse are discussed in some detail.This study will serve as a reference for the collapse-resistance design of super-tall buildings of similar type.