A detailed comparison of two R-curves for geometry type I is made between two basic concrete fracture models,i.e.,two parameter fracture model(TPFM)and size effect model(SEM).After modifications to the effective crack length and crack tip opening displacement,expressions of Rcurve are proposed from TPFM and SEM.Comparisons of the load-displacement curves from these two R-curves with experimental results reveal that critical effective crack length from SEM is a little larger than that from TPFM,while the max...
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