| 对减轻钢结构逐步破坏的改造方法的效应评估 |
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| 引用本文： | Khaled Galal,Tamer El-Sawy. 对减轻钢结构逐步破坏的改造方法的效应评估[J]. 钢结构, 2010, 0(4) |
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| 作者姓名： | Khaled Galal Tamer El-Sawy |
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| 摘 要： | 根据GSA和DoD为预防结构逐步破坏而制订的规范中所推荐的APM方法,对提高重力荷载下,钢结构抗弯能力的三种改造方法的有效性进行了分析。主要采用的是三维非线性动力分析法。分析模型为6×3跨的18层钢结构,这个结构曾由于底层突然移除一根柱而遭受到破坏。对跨长为5,6,7·5,9m的4个建筑进行了分析。分别采用三种方法改造结构并对其进行了评估,即增加梁的强度、增加梁的刚度以及同时增加梁的强度与刚度。通过分析改造后梁的转角、约束力和位移延性这三个性能指标的增强效应,来评估相应改造方法的有效性。
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| 关 键 词： | 逐步破坏 钢结构 改造 加固 转角 约束力 位移延性 |
Effect of Retrofit Strategies on Mitigating Progressive Collapse of Steel Frame Structures |
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| Khaled Galal , Tamer El-Sawy. Effect of Retrofit Strategies on Mitigating Progressive Collapse of Steel Frame Structures[J]. Steel Construction, 2010, 0(4) |
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| Authors: | Khaled Galal Tamer El-Sawy |
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| Abstract: | In this study,the effect of three retrofit strategies on enhancing the response of existing steel moment resisting frames designed for gravity loads is investigated using Alternate Path Methods (APM) recommended in the General Services Administration (GSA) and the Department of Defense (DoD) guidelines for resisting progressive collapse.The response is evaluated using 3-D nonlinear dynamic analysis.The studied models represent 6-bay by 3-bay 18-storey steel frames that are damaged by being subjected to six ... |
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| Keywords: | Progressive collapse Steel frame Retrofit Strengthening Chord rotation Tie forces Displacement ductility demand |
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