断裂过程区折线应力分布模型

在分析了线弹性材料裂纹前缘应力场与混凝土材料裂纹尖端应力场之间关系的基础上，提出描述混凝土裂纹前缘微裂区应力卸载曲线的折线应力分布模型，并据此导出描述上述两应力场之间联系的场关系方程．这一模型为寻求混凝土裂尖应力场、位移场的解析解奠定了基础．

Segmented linear stress distribution model for crack process zone

After studying the relationship between the stress field at the crack tip of linear elastic material and that of concrete material, a bilinear stress distribution model to describe the stress unloading curve at the microcracked zone in front of the concrete crack is presented. Based on this the fundamental equation which characterizes the stress field between the above mentioned two materials is then derived accordingly. It serves the basis to find the analytical soluion of stress and displacement fields at the concrete crack tip.