基于ANSYS二次开发的倒张型悬索桥分阶段非线性优化设计

Stepping Nonlinear Optimal Design of Under-Tension Suspension Bridge Based on Second-Development of ANSYS

在对倒张型悬索桥进行设计时,基于倒张型悬索桥的施工形成过程,首先建立施工阶段和成桥阶段的参数化有限元模型,然后提出随机优化、零阶优化和一阶优化相结合的综合非线性优化方法。同时,通过对ANSYS程序的二次开发,利用ANSYS的APDL语言和UPFs特性,编制倒张型悬索桥全面优化设计和非线性有限元分析综合辅助程序。采用提出的综合非线性优化方法和编制的综合辅助程序,对施工阶段和成桥阶段的倒张型悬索桥进行优化设计。在优化设计的过程中,考虑各种非线性因素的影响,对倒张型悬索桥设计和施工中的关键因素进行优化,从而使倒张型悬索桥的受力和变形达到比较合理的状态。从优化前后的非线性有限元分析结果来看,文中采用的综合非线性优化方法简单高效,十分利于多变量非线性优化;编制的倒张型悬索桥全面优化设计和非线性有限元分析综合辅助程序,很好地解决了倒张型悬索桥的优化设计问题,优化的效果明显。

Parameterized finite element models of an under-tension suspension bridge are established based on the construction phase when a bridge of this kind was designed. At the same time a synthesized nonlinear optimal method is proposed, which relates random optimization, subproblem optimization and first-order optimization together. Then a synthesized assistant program is compiled, which uses the APDL language and UPFs of ANSYS. Based on second-development of ANSYS the program can be used for an under-tension suspension bridge to be optimized and nonlinearly analyzed. Finally the bridge is analyzed and optimized by the method and the program proposed. In the optimization all kinds of nonlinear factors are considered. After optimization some key aspects in the design and construction of the bridge are more reasonable and optimal. From comparison of results before and after optimization of the bridge, the synthesized nonlinear optimal method is simple and effective, which is suitable for multi-variable optimal design very much. And the optimal design of the under-tension suspension bridge is well realized by the compiled synthesized program for the comprehensive optimization and nonlinear analysis of the bridge. All the results show that the method and the program proposed are very effective in the paper.