弦支穹顶结构预应力优化方法  

AN OPTIMIZATION METHOD FOR PRESTRESS OF SUSPENDED-DOME STRUCTURES

作　　者：符申超 周德源[1] 王庆春[1] 

机构地区：[1]同济大学结构工程与防灾研究所,上海200092

出　　处：《钢结构》2015年第11期20-23,共4页Steel Construction

摘　　要：初始预应力的分布方式是影响弦支穹顶结构整体性能的关键。以预应力平衡态下,弦支穹顶结构竖向撑杆的内力能最大程度地抵消其上节点的等效节点荷载为优化目标来确定结构的初始预应力。采用APDL语言在通用有限元软件ANSYS中实现该优化过程,通过改变环向拉索的初始预张力来调整预应力平衡态下撑杆的内力,经过反复迭代实现优化目标。优化算例的结果表明,该优化方法迭代计算效率高、优化效果好、概念清晰、易于实现,具有良好的应用前景。Distribution of initial prestress is the key to influence the overall performance of a suspended-dome structure.The idea that in prestress equilibrium state,axial force of each strut can mostly offset the equivalent load of its upper node,was taken as the optimal goal to decide the initial prestress distribution in this article.The method has been realized by finite element software ANSYS with APDL.In order to achieve the optimal goal,axial forces of struts were adjusted in iterative process by changing initial prestress of hoop cables.Results of the optimization example indicated that this optimal method could get satisfactory solutions effectively while being easily understandable and attainable,and thus has a very good perspective of application.

关 键 词：弦支穹顶 初始预应力分布 预应力优化方法 ANSYS 

分 类 号：TU399[建筑科学—结构工程]