Fracture characteristics of hydraulic concrete under complex loading conditions
In order to study the fracture behavior of hydraulic concrete under different loading conditions,the wedge splitting tests of monotonic and post-peak cyclic loading at three loading rates(0.001 mm/s,0.01 mm/s,0.1 mm/s)were carried out on notched cubic hydraulic concrete specimens with dimensions of 300 mm and 450 mm.The results show that with the increase of loading rate,crack initiation load,peak load,crack initiation fracture toughness,instability fracture toughness and fracture energy increase gradually,and the critical fracture length gradually decreases,which has an obvious strain rate effect.Under different loading rates,the critical crack length varies with the crack mouth opening displacement in two stages.Under cyclic loading,the stiffness degradation of the specimen weakens and the total dissipated energy decreases with the increase of loading rate.The fracture damage evolution model of hydraulic concrete based on dissipated energy can well reflect the fracture damage development law of hydraulic concrete.
hydraulic concreteloading rateloading conditionfracture characteristicsdissipated energy
万方数据
维普
