损伤梁单元等效节点荷载的计算及应用

分析了基于有限元刚度法形成单元等效节点荷载的局限性,通过引入截面割线柔度,研究了基于有限元柔度法理论计算损伤梁单元等效节点荷载的方法.由于不需要迭代,该方法能与经典结构非线性分析体系完全兼容.采用自主开发的结构非线性分析软件,对钢筋混凝土框架结构进行非线性全过程分析.研究表明,考虑了损伤的梁单元等效节点荷载,可更准确地反映结构在强非线性阶段的实际受力情况,提高计算效率,改善结构非线性分析的收敛性和稳定性.

Calculation and Application of Equivalent Nodal Load on Damaged Beam Element

An analysis was made of the correlative limitation of traditional stiffness method.Based on the finite element flexibility method theory,a new calculation method for the equivalent nodal load of the damaged beam element was proposed by introducing the sectional secant-flexibility,which was compatible with conventional nonlinear structural-analysis because an iteration was not required.A static and nonlinear overall-analysis was also made for a renforced concrete frame structure with a self-development software.A case study shows that by taking the structural damage into consideration,nonlinear structural-analysis improves in terms of its efficiency,convergence and stability with the equivalent nodal load method.