Study on Underwater Anti-explosion Effect Evaluation and Damage Prediction of Steel Fiber Reinforced Cellular Concrete Slab

In order to evaluate the effect of steel fiber volume fraction on the anti-explosion performance of cellular concrete, this study analyzed four steel fiber contents of 0.5%, 1.0%, 1.5%, and 2.0%. On this basis, the effects of protective layer thickness and explosive amount on the anti-explosion performance of the structure were further explored. The results show that the protective layer with 1.5% steel fiber content can provide the best protective performance. The influence of explosion shock on the protected structure has been significantly attenuated. The peak pressure at the measuring point and the damage degree of the protected structure are significantly reduced compared with the unreinforced concrete slab. It is found that the SAP20S15 ratio protective layer can still maintain a high energy absorption effect by increasing the amount of explosives, and increasing the thickness of the protective layer can directly and effectively reduce the damage level of the protected structure. Fitting curves are meticulously provided to illustrate the damage degree of the safeguarded structure under the distinct influences of fiber content, explosive mass, and protective layer thickness. These curves enable a rapid evaluation of how these three factors influence the explosion resistance of the protective layer.