INFLUENCE OF REINFORCEMENT DIAMETER AND SPACING ON IMPLOSION RESISTANCE OF ULTRA-HIGH PERFORMANCE CONCRETE

The reinforcement form of ultra-high performance concrete structures significantly impacts the blast resistance characteristics. Numerical methods are thusly utilized to study the effect of different reinforcement forms on the blast resistance of ultra-high performance reinforced concrete. The experimental results are used to verify the reliability of numerical modeling and material parameters, and established are 32 explosive-air-UHPC-rebar numerical models with different steel diameters and spacings. By analyzing the local damage of the structure and the displacement of the back blast surface, presented are the blast resistance characteristics of ultra-high performance concrete structures with different reinforcement forms under explosion. The results show that the dynamic damage laws of steel-UHPC structures are similar under different reinforcement ratios. The diameter of the steel bar is the main factor affecting the blast resistance performance of the structure. Under local loading, the blast resistance performance of the UHPC with thin steel bars is better than that of thick steel bars, and the effect of uniform reinforcement is the best. When the overall load is applied, the difference between UHPC structures with the same reinforcement ratio is small.