基于双剪强度理论的改进型混凝土强度准则

An improved failure criterion for the concrete based on unified twin shear strength theory

在已有混凝土强度理论的基础上,提出了一种改进型混凝土强度准则.该准则通过线性插值,将统一双剪强度理论和混凝土拉伸和压缩子午线的实验结果结合起来,改进了?平面的屈服轨迹.结合已有实验结果,研究了统一双剪强度理论中b参数与静水应力的关系.该强度准则满足外凸、开口和关于静水应力轴三轴对称等特性,参数具有明确的物理意义,并且与现有实验结果有很好的近似.同时,所提出的改进型混凝土强度准则也适用于其它工程材料.

On the basis of the prevailing failure criterion for concrete, an improved strength criterion was presented. Through linear-interpolation of unified twin shear strength （UTSS） theory, the experimental tensile and compressive meridians were introduced. Furthermore, several widely used experimental curves offered the relationship between and hydrostatic stress. The general characteristics of concrete failure surface, such as convexity, open-endedness and three-axis symmetry about the hydrostatic axis were also fulfilled. Comparison with experimental results showed that the criterion could predict concrete strength more accurately. This construction procedure for strength criterion from UTSS theory is also suitable for other engineering materials.