摘要
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。
A substructure is introduced to analyze collapse resistance of the structure, using a rapid effective method to evaluate anti-collapse performance of the structure. The alternate load path method is used and a general steel frame beam-column substructure is chosen as the analytical research object, then a theoretical calculation model of the collapse resistance of beam-column substructure is developed. According to the internal force changes of the beam-column substrucutre, the whole loading process can be divided into four stages, and at different stages the formulas for vertical bearing capacity-deformation for the asymmetric span beam-column substructure are given. Focus is placed on the mechanical transformation of resistance from flexural mechanism to catenary mechanism, namely the process of beam-column substructure converting from bending to stretch bending and then resisting exterior load mainly by stretching force, and the theoretical calculation formulae are verified by numerical calculations to meet the demands of accuracy for engineering.
出处
《工程力学》
EI
CSCD
北大核心
2017年第5期125-131,共7页
Engineering Mechanics
基金
国家自然科学基金青年科学基金项目(51308442)
关键词
钢框架
不对称跨度
梁柱子结构
抗倒塌机制
理论公式
steel frame
asymmetric span
beam-column substructure
anti-collapse mechanism
theoretical formula
