【摘要】 该文基于显式动力学数值模拟分析、结构静力加载试验和振动台试验,对单榀框架结构、高层空间框架结构以及高层框架-核心筒结构在静力及动力荷载下的倒塌机制进行研究,分别从受力原理、破坏机制、失效顺序及范围等多方面进行分析,并根据失效柱处梁的变形、梁端局部受压区单元失效、关键构件底部钢筋应力时程、结构倒塌整体变形以及局部破坏等情况,对结构在倒塌过程中的"悬链线机制"开展情况进行研究。同时,对此类结构的抗倒塌设计提出建议。更多还原

【Abstract】 Based on explicit dynamic numerical simulation analysis, the large-scaled static loading test, the large-scaled shaking-table test, and the plane reinforced concrete frame collapse test, the paper investigated collapse mechanism under static loads and dynamic loads for reinforced concrete structures including high-rise frame structures and high-rise frame-core tube structures. Some key factors including the mechanical principle, the damage mechanism, the failure order and the failure range were analyzed. The development of "catenary action"in different working conditions were studied according to the beam deformation in the vicinity of the removed column, local condition of beam end, stress time-history curves of bottom bar and collapse damage situation.Mainwhile, suggestions on the collapse resistant design of these kinds of structures were put forward.更多还原