混凝土裂缝开展宽度计算的有限单元法

Finite element method of crack width computation in concrete structures

本文采用“最大拉应力单元开裂”准则，改进了非线性分析的迭代流程，使其最大可能地模拟实际结构的开裂情况，进而可以基于分布裂缝模式计算裂缝发生位置、裂缝间距、裂缝开展深度和宽度。算例表明，该法所计算的裂缝分布规律是正确的，计算裂缝宽度与试验实测值及规范公式计算值基本吻合。

The criterion of the element with the maximum tensile stress will crack is presented, the iteration flow diagram of nonlinear analysis is improved, and then the position, gap and width of crack can be computed based on ′smeared′ crack model. The examples show that the computed crack distributive pattern is reasonable and correct and the computed crack width is in agreement with experiment observation data and computed results of code formula.