基于能量平衡原理的有限单元耦合方法

结构非线性数值计算分析应真实反映局部损伤破坏细节,以作为损伤演化全过程分析的依据。对同类构件,有限单元耦合方法可以解决破坏细节与整体模拟的空间尺度差异问题。基于能量平衡原理,建立了梁与实体单元、梁与壳单元以及壳与实体单元的耦合方程,适用于结构的损伤数值计算。对某RC框架结构原位推覆试验的损伤数值分析表明,有限单元耦合模型能正确反映整体结构的承载力和变形性能,并且能准确反映局部损伤破坏细节。

Finite element coupling equations based on energy-balance theory

In order to analyze the entire damage process of structures, nonlinear numerical calculation and analysis should reflect the damage details of the local regions.For the same member, the different simulation methods come from the different special scales of the damage details and global member could be realized by the finite element coupling equations.Based on the energy-balance theory, the coupling equations for the beam element to solid elements, beam element to shell elements and shell elements to solid elements are established.Those coupling equations are available for the damage numerical calculation.The simulation for one in-situ pushover test of RC frame structure shows that the element coupling model could reflect correctly the structural bearing capacity and deformation behavior and the damage details.