弦支穹顶结构形态分析与施工控制

Form analysis and construction control of suspended dome structure

为了解决多索预应力结构在找力与找形分析中需多次迭代而导致效率低下的问题,进一步改进该类结构的分析方法,采用理论推导与数值计算相结合的方法,对弦支穹顶结构找力分析过程中的迭代格式进行改进,提出改进的找力分析方法.并以此为基础更新找力加找形分析方法,给出完整的计算流程,得到弦支穹顶结构的零状态几何、拉索下料长度以及与之相对应的初始应变.基于ANSYS软件中的APDL语言编制计算模块,通过两个算例,验证本文计算方法的正确性与精确性.本文方法亦可用于预应力结构施工全过程的模拟计算.

In order to deal with the problem of multiple iteration and low efficiency in force finding and form finding analysis process of multi-cable prestressed structure and improve further the analysis method for this kind structure, the method of theoretical derivation combined with numerical calculation is adopted to improve the iteration format in the force finding process of the suspended dome structure and an im- proved force finding analysis method is presented. Taking it as a basis, the force finding plus form finding analysis method is updated and a complete computation flowchart is provided, and the zeroth state geome- try, stock cutting length of cable and initial strain are obtained. A computational module is developed based on APDL language of ANSYS software, the correctness and accuracy of the method is verified by two examples. This method also can be used to simulate the complete construction process of the pres- tressed structures.