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本文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。
Abstract
Based on the inequality interactive analysis of the different structural components bearing capacity, the yield mechanism control method of steel concentrically braced frame was proposed. Then, the improved genetic algorithm was used to propose the structural optimization method based on the yield mechanism control with the structural total weight as the objective function. Furthermore, the published experimental data, 48 finite element models and several steel concentrically braced frame examples were verified the validity of the structural yield mechanism control method, the computational efficiency and accuracy of the optimization method. The results show that the component parameter ranges calculated by the proposed method could effectively control the yield sequence of the structural components. In the engineering practice application, the sequence is, however, highly sensitive to components’ parameter values, which was not suitable for selecting the maximum or minimum values of range. The brace’s external diameter should be selected larger within the parameter range to avoid premature yield of compression brace. Meanwhile, the parameter ranges calculated by the yield mechanism method also could greatly reduce the initial solution domain space, which could improve the computational of the 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
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Key words
steel concentrically braced frame /
yield mechanism control /
iterative computation of inequality /
optimization method /
numerical simulation
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