大型土木结构的结构行为一致多尺度模拟——模拟方法与策略

Concurrent multi-scale modeling of structural behavior for response analysisof large civil infrastructure——modeling methodology and strategy

针对大型土木结构以结构健康监测和损伤评估为目标的有限元分析的需要,从理论上探讨了复杂土木结构的结构行为一致多尺度模拟的方法和策略,指出对于大型复杂土木结构而言,适合考虑局部细节特性的结构行为多尺度建模的策略是:对于有限个需要重点关注的局部细节采用"小尺度"建模,而结构其他部分采用"大尺度"建模。针对目前大型复杂土木结构的建模都是借助于大型商用有限元软件,而现有软件都无法直接做到结构行为一致多尺度模拟,文中引入有限元方法中的子结构方法,从数学描述上对传统子结构方法加以改进,使之适合解决结构行为一致多尺度模拟问题。

The modeling method and strategy were investigated in the theoretical frame of concurrent multi-scale modeling of structural behavior （CMSM-of-SB） in which the global structural behavior and features of local details in a large complicated structure could be considered simultaneously in order to meet the structural health monitoring （SHM） and damage assessment. In the proposed modeling method, the ＂large-scale＂ modeling is adopted for the global structure and the ＂small-scale＂ modeling is adopted for the critical locations. Considering the shortcoming of some existing finite element software which are not able to implement the modeling of CMSM-of-SB, the substructure technology in finite element method was introduced and some improvements on the traditional substructure technology were provided to incorporate the mathematical description of the modeling of CMSM-of-SB on the basis of the substructure method.