Experimental Research and Finite Element Analysis on Blast Damage of Unreinforced Steel Fiber Concrete T-beam Structures

To reveal the dynamic behavior and damage mechanism of unreinforced concrete T-beam bridge under blast loads, three specimens were designed. Dynamic strain, acceleration and acoustic velocity pro- and post-blast of three specimens were measured respectively, and the generation, development process and distribution condition of cracks were investigated. The results indicated that ribbed slab fracture failure was a key to the unstable failure of the whole T-beam bridge specimen. Adding steel fiber evenly to the T-beam bridge deck can change the degree of blast damage from “severe damage” to “moderate damage”, which improves the explosion anti performance of the bridge structures. The damage evaluation results provide the basis for damage repair and reinforcement treatment after explosion.