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大型土木结构的损伤破坏是跨尺度演化的结果,因此单一尺度下的结构分析难以正确地反映结构的非线性损伤失效过程。该文根据结构损伤在宏观、细观尺度下的不同特征建立结构一致多尺度模型,并通过多点约束法进行跨尺度关联,实现了结构整体线弹性响应分析和局部细节易损部位的细观层次上弹塑性损伤分析的并发进行。计算结果表明:该文提出的结构损伤多尺度并发计算方法能够兼顾结构整体上的线弹性响应和局部易损部位在细观层次上的塑性损伤特征,在对结构多尺度响应与损伤特征进行准确描述的基础上,能够获得结构易损局部的细观损伤状态、演化过程及其对结构宏观响应与失效的影响。
The damage of large-scale civil structures is the result of cross-scale evolution. Therefore, the structural analysis at single scale can not accurately reflect the failure process of nonlinear damage of structures. This paper constructs a structurally consistent and multi-scale model according to different characteristics of structural damage at the macroscopic and mesoscopic scales, and carries out cross-scale correlation through multi-point restraint method to realize the overall linear elastic response analysis and the fine detail of the fragile detail of local structure The level of elastoplastic damage analysis is carried out concurrently. The calculation results show that the proposed multi-scale structural damage damage concurrent calculation method can take into account the linear elastic response of the whole structure and the plastic damage characteristics of the local vulnerable parts at the mesoscopic level. In the multi-scale structural response and damage characteristics, On the basis of the description, we can obtain the damage state and evolution process of the fragile local structure and its effect on the macroscopic response and failure of the structure.