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在开发钢框架CAD系统的基础上通过对满应力优化算法的改进与拓展,将浮动应力指数法用于空间钢框架的优化设计;在结构整体优化方面,拓展了空间梁单元基于刚度的构件重要性的评估方法,在满应力优化的基础上对构件的应力比限值进行不同层次的修正,以各杆的惯性矩作为设计变量,每次迭代进行一次内力分析,然后走一个满应力步,根据相关的应力比结果进行位置移动,并最终收敛到优化的较优解.理论推导和算例表明,所给出的方法能够有效地反映结构中存在的薄弱环节,为结构实用优化技术的实现提供了必要的理论依据.
Based on the development of the steel frame CAD system, the floating stress index method is applied to the optimization design of the space steel frame through the improvement and expansion of the full stress optimization algorithm. In the overall structural optimization, it is important to expand the stiffness-based components of the space beam element Based on the full stress optimization, the stress ratio of the components is modified at different levels. The moment of inertia of each rod is taken as the design variable. After each iteration, an internal force analysis is performed, and then a full stress step is performed. According to the related stress ratio results, the position is shifted and finally converges to the optimal solution. The theoretical derivation and examples show that the proposed method can effectively reflect the weak links existing in the structure and provide the practical application of structural optimization techniques Provided the necessary theoretical basis.