软化指数对混凝土断裂过程区尺度的影响

Influence of Tensile Strain Softening Index on Size of Fracture Process Zone

应用Muskhelishvil应力函数全场解,根据幂指数函数描述的混凝土拉应变软化模型导出断裂过程区(FPZ)过程值及临界值的解析表达式,分析了在最大拉应变强度理论下软化指数对FPZ过程值及临界值的影响。结果表明:混凝土FPZ过程值及临界值都随着软化指数的增加而增加,不同泊松比下变化规律相近。

The developing size and critical size of concrete fracture process zone （ FPZ） is obtained by use of a power exponent function considering the effect of the tensile strain softening based on the stress function of Muskhelishvil .The influences of tensile strain softening index on the developing size and critical size of FPZ are studied .The results show that the developing size and critical size of FPZ increase with the increasing tensile strain softening index and the law is very identical with different Poisson＇s ratios.