箱型结构损伤分析的空间网格多尺度模拟方法

为高效模拟空间效应显著的结构在关键局部的损伤，本文研究建立了以损伤分析为目标的空间网格多尺度模拟方法．首先基于变形协调法和内力平衡法，研究了空间网格多尺度建模中的跨尺度界面连接方法，对比分析了两种界面连接合理性．以三跨连续刚构混凝土箱梁在地震载荷下的损伤为分析案例，验证了空间网格多尺度模型在结构损伤分析中的可行性及其在计算效率上的优越性．分析结果表明：空间网格多尺度模型可以精确模拟结构的静力效应和动力特性；空间网格多尺度模型既考虑了结构空间效应，又可以高效分析箱梁结构局部易损部位的损伤演化过程，从而为空间效应显著的结构损伤分析提供了更为实用精细的计算模拟方法．

Spatial Grid Multi-Scale Simulation Method for Structural Damage Analysis of Box Structures

In order to efficiently simulate the damage of structures with significant spatial effects in key parts, a multi-scale spatial grid simulation method for damage analysis was established in this paper. Firstly, based on the deformation coordination method and force balance method, the cross-scale interface connection method in spatial grid multi-scale modeling is studied, and the rationality of the two interface connections is compared and analyzed. Taking the damage of three-span continuous rigid frame concrete box girder under seismic load as an example, the feasibility and superiority of spatial grid multi-scale model in structural damage analysis are verified. The results show that the spatial grid multi-scale model can accurately simulate the static effects and dynamic characteristics of structures. The spatial grid multi-scale model not only considers the spatial effect of the structure, but also can efficiently analyze the damage evolution process of the local vulnerable parts of the box girder structure, thus providing a more practical and precise computational simulation method for the structural damage analysis with significant spatial effect.