| 采用优化方法进行钢框架抗连续倒塌设计 |
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| 摘 要： | 采用结构优化方法设计钢框架,提高其对临界柱突然拆除而引起的连续倒塌的抵抗性能。利用美国UFC规范抗连续倒塌设计中建议的线性静力、非线性静力或非线性动力分析方法,采用构件拆除法获得结构抗连续倒塌性能。以某9层3跨规则钢框架平面模型为例,优化构件尺寸使总用钢量最小,并满足AISC抗震规范和UFC规范抗连续倒塌的要求。结果表明:无论采用哪种分析方法,最小用钢量抗震设计都不能明确考虑连续倒塌且不能满足构件拆除法的要求。采用线性静力方法进行抗连续倒塌设计最保守,效果最差。相比而言,若以UFC抗连续倒塌允许值为标准,只要模型和计算过程正确,非线性静力和动力分析能使设计更经济。
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| 关 键 词： | 钢框架 连续倒塌 构件拆除法 非线性分析 优化 |
Progressive Collapse Design of Seismic Steel Frames Using Structural Optimization |
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| Authors: | Min Liu |
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| Abstract: | This paper uses structural optimization techniques to cost-effectively design seismic steel moment frames with enhanced resistance to progressive collapse,which is triggered by the sudden removal of critical columns.The potential for progressive collapse is assessed using the alternate path method with each of the three analysis procedures(i.e.,linear static,nonlinear static,and nonlinear dynamic),as provided in the United States Department of Defense United Facilities Criteria(UFC) Design of Buildings to R... |
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| Keywords: | Steel frame Progressive collapse Alternate path method Nonlinear analysis Optimization |
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