爆炸载荷作用下不同强度超高性能混凝土梁毁伤效应

The damage effects of ultra-high performance fiber reinforced concrete (UHPFRC) beams with different strengths subjected to blast loading are studied,with a focus on protecting typical architectural components from explosion. The influences of fiber content and longitudinal reinforcement type on the failure mode and dynamic response of UHPFRC beams are studied througth experiment. The results show that the increase in the fiber content and the use of high-strength steel (HSS) longitudinal reinforcement can improve the bending resistance of UHPFRC beams. A finite element model for UHPFRC beams under blast loading is developed to expand the research on damage effect. The parameters of the K&C constitutive model are calibrated using the single element test method,considering the factors like strength planes,equations of state, shear dilation, damage evolution, and strain rate effects. The quasi-static experiments demonstrate that the modified constitutive model parameters provide a more precise description of the mechanical characteristics of UHPFRC. Furthermore,the accuracy of the finite element model is also validated based on explosive experimental data. Finally,the influences of concrete strength, steel reinforcement type,and charge masses on the damage effects of UHPFRC beams at close range are further analyzed through parameter analysis.