摘要
对于大型结构发生参数大修改时,采用组合近似算法进行结构位移重分析会使所得的近似解与真实解误差较大.为了解决组合近似算法在大型结构发生参数大修改时的求解精度不足缺陷,提出了3种改进的结构静力重分析方法.该3种改进算法都是基于组合近似算法,并分别通过位移迭代修正、刚度逐步逼近等措施使求解精度不断提高.通过2个算例验证了3种改进算法的有效性和高效性,并对3种改进算法之间的求解效率进行了比较.
This study presents three static reanalysis methods for large-scale structures with large modifications of structural parameters based on the Combined Approximation（CA） method.For large-scale structures with large changes in the design,the Combined Approximation method can not provide enough accurate results. To improve the accuracy of the results in reanalysis of the modified structure,three CA-based static reanalysis methods are presented by introducing several strategies,such as displacement iterative correction and stiffness progressive approximation.Two numerical examples are presented to demonstrate the validity and the improvement of the proposed methods,and the results show that the methods given can provide accurate approximations and can significantly reduce the computational effort involved in reanalysis of large-scale structures with large modifications.Comparisons of the computational costs of these three presented methods are made.
出处
《力学学报》
EI
CSCD
北大核心
2011年第2期355-361,共7页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金(50808116)
华南理工大学亚热带建筑科学国家重点实验室开放基金(2008KB25)资助项目~~
关键词
静力重分析
近似重分析
组合近似法
大型结构
大修改
static reanalysis
approximate reanalysis
combined approximation method
large-scale structure
large modification
