Progressive Collapse of Reinforced Concrete Structures: A Multihazard Perspective
Progressive Collapse of Reinforced Concrete Structures: A Multihazard Perspective
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DOI：
10.14359/19073
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发表时间：
2008
影响因子：
1.8
通讯作者：
M. Sasani;Serkan Sagiroglu
中科院分区：
文献类型：
--
作者：
M. Sasani;Serkan Sagiroglu
由于事故或恐怖主义行为，建筑物可能处于可能导致逐步倒塌的条件下。结构局部损伤后荷载的再分配取决于结构的强度、连续性、冗余、变形和耗能能力。对于钢筋混凝土框架结构，这些特性在很大程度上取决于地震和风的设计荷载。本文利用多自由度和等效单自由度体系的响应，证明了框架结构对人为灾害引起的渐进倒塌的脆弱性在很大程度上取决于其对自然灾害的抵抗力。结果还表明，在失去一根柱后，即使满足当前结构完整性要求，也可能发生梁底杆过早断裂。如果将最小梁底连续钢筋设置为等于最小受弯钢筋，则可以避免这种钢筋断裂。
Through accident or act of terrorism, structures may be subject to conditions that could lead to progressive collapse. Redistribution of loads following an imposed local damage to a structure depends on strength, continuity, redundancy, and deformation and energy dissipation capacities of the structure. For reinforced concrete frame structures, these characteristics depend on the seismic and wind design loads to a great extent. In this paper, using the response of multi-degree-of-freedom and equivalent single-degree-of-freedom systems, it is demonstrated that the vulnerability of frame structures against progressive collapse caused by man-made hazards depends heavily on their resistance to natural hazards. It is also shown that following the loss of a column and in spite of satisfying the current structural integrity requirements, premature beam bottom bar fracture can occur. Such bar fracture can be avoided if the minimum beam bottom continuous bars are set equal to the minimum flexural reinforcement.