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本文利用微小非线性杆单元来表示虚拟裂纹处的混凝土的软化性能， 这样， 可以避免用其它方法计算软化性能时的烦琐处理， 而直接应用通常的有限单元法． 同时对位移控制增量法进行了特殊处理， 避免了过渡元问题带来的误差． 计算结果表明， 在定性与定量上都能得到相近的结果．
In this paper, the micro-nonlinear rod element is used to represent the softening performance of the concrete at the virtual crack. In this way, it is possible to avoid the cumbersome processing when other methods are used to calculate the softening performance, and the usual finite element method is directly applied. At the same time, the displacement control incremental method is specially processed to avoid the error caused by the transition element problem. The calculation results show that similar results can be obtained qualitatively and quantitatively.