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将子结构引入结构抗倒塌分析是评估结构抗倒塌性能的一种快速有效方法。采用备用荷载路径法,选择钢框架梁柱子结构作为研究对象,建立了分析梁柱子结构抗倒塌能力的理论计算模型,研究了梁柱子结构由梁抗倒塌机制向悬链线抗倒塌机制转换的过程及机理。根据梁柱子结构内力变化将整个抗倒塌过程划分为4个阶段,推导了不对称跨度情形下梁柱子结构在不同阶段的承载力及挠度变形计算公式,分析了梁柱子结构由抗弯向拉弯转化并最终主要依靠拉力抵抗外载的全过程,并通过数值算例验证了理论计算公式,满足工程计算的精度要求。
Introduction of Substructures into Structures Collapse analysis is a fast and efficient method of evaluating the structural collapse resistance. The alternative load path method is adopted to select the steel frame beam-column structure as the research object, and the theoretical calculation model for analyzing the collapse resistance of the beam-column structure is established. The conversion process of the beam-column structure from the anti-collapse mechanism to the catenary collapse mechanism is studied And mechanism. According to the change of internal force of beam-column structure, the whole process of anti-collapse is divided into four stages. The calculation formula of bearing capacity and deflection at different stages of beam-column structure under asymmetrical span is deduced. Finally, it mainly relies on the pulling force to resist the whole process of external loading, and the theoretical calculation formula is verified through numerical examples to meet the accuracy requirements of engineering calculation.