response characteristics of a steel fiber-reinforced porosity-free concrete beam under an impact load

The utilization of ultra-high-strength concrete offers a weight reduction of concrete structures and improvements in disaster protection performance. recently, porosity-free concrete (pfc) having the world’s highest compressive strength of 400 mpa has been developed, and its basic mechanical properties were determined; however, its impact-resistant capacity is yet to be examined. in this study, investigation of the impact resistance behavior of pfc is performed using a weight dropping impact test on a fiber-reinforced pfc beam. steel fiber-reinforced pfc is used for preventing brittle failure, and the full plastic moment of the pfc beam cross-section is determined based on material test results. also, the estimation of maximum response deflection is attempted by a simple plastic analysis. it was demonstrated that the response deflection could be reduced by 30–50% by increasing the steel fiber mixing rate in the pfc beam from 1 to 2%. the proposed estimation method revealed that the response deflection of the pfc beam could be estimated with an accuracy of approximately 80% considering the calculated full plastic moment when the plastic hinge is clearly formed. in the future, to establish a design procedure for the impact-resistant capacity of protective structures from steel fiber-reinforced pfc, it is necessary to conduct experimental and numerical research focusing on ultimate strength, including statistical processing.