求解梁的荷载-位移全曲线的一种方法

Minute nonlinear rod element method for determining the relationship between load and displacement of three\|point bending concrete beam

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,a minute nonlinear rod element is used to express the virtual softened behavior of fictitious crack of concrete.Thus the FEM can be applied directly.Furthermore,the displacement increment method can also be applied when particular procedure is used.The calculation results are in good agreement with that based on fictitious model.