基于屈服机制控制的中心支撑钢框架结构优化方法研究  

Optimization method of steel concentrically braced frame based on yield mechanism control

作　　者：李彬 王湛[1] 范延静 潘建荣[1] 王鹏[1,2] 周振峰 LI Bin;WANG Zhan;FAN Yanjing;PAN Jianrong;WANG Peng;ZHOU Zhenfeng(State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,China;School of Environment and Civil Engineering,Dongguan University of Technology,Dongguan 523808,China)

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广州510640 [2]东莞理工学院生态环境与建筑工程学院,广东东莞523808

出　　处：《振动与冲击》2023年第15期285-297,共13页Journal of Vibration and Shock

基　　金：国家自然科学基金面上项目(51978279;52278181);广东省基础与应用基础研究基金(2020A1515011307;2021B1212040003);亚热带建筑科学国家重点实验室自主研究课题(2022KA04;2022KB15);亚热带建筑科学国家重点实验室开放课题(2021ZB12)。

摘　　要：通过对结构中不同构件承载力关系进行不等式迭代分析,建立了中心支撑钢框架结构屈服机制控制方法,结合改进的遗传算法,以结构总重为目标函数,提出了基于屈服机制控制的结构优化分析方法。通过现有试验、48个有限元模型及多个中心支撑钢框架结构实例,分别针对结构屈服机制控制方法及该文章优化方法的计算效率、准确性进行验证分析。结果表明:屈服机制控制方法能保证结构构件按照预设置顺序屈服,而在实际应用过程中,不宜选取灵敏度较高的范围边缘参数,但应在参数范围内选取外径较大的支撑截面参数避免受压支撑过早屈服;利用参数范围进行优化分析,可有效减小优化搜索初始解域,提高优化分析的计算效率。Here,through inequality iterative analysis for load-bearing capacity relations of different components in structure,a yield mechanism control method for steel concentrically braced frame was established.Combined with the improved genetic algorithm,a structural optimization analysis method based on yield mechanism control was proposed taking the total weight of structure as the objective function.Through existing tests,48 finite element models and multiple actual examples of centrally supported steel frame structure,computational efficiencies and accuracies of the structural yield mechanism control method and the proposed optimization method were verified and analyzed,respectively.The results showed that the yield mechanism control method can ensure structural components yielding according to the preset sequence;in practical applications,it is inappropriate to select range edge parameters with higher sensitivity,but parameters of support cross-section with larger outer diameter should be selected within parametric ranges to avoid premature yielding of compressed braces;adopting parametric ranges for optimization analysis can effectively reduce initial solution domain of optimization search and improve computational efficiency of optimization analysis.

关 键 词：中心支撑钢框架结构 屈服机制控制 不等式迭代 优化方法 有限元分析 

分 类 号：TU212[建筑科学—建筑设计及理论] TU213.3