Analysis of deformation characteristics of high-strength reinforced concrete beams under explosion load

The dynamic response and failure characteristics of reinforced concrete beams under explosion loads are affected by various factors. To study the effect of reinforcement strength on the deformation properties of RC beams and to analyze the deformation differences of high-strength RC beams under different explosion loads, comparative explosion tests on two kinds of simply supported RC beams with longitudinal reinforcement yield strength of 400 MPa and 700 MPa were carried out respectively in this paper. The test results show that the deformation of the mid-span section concrete of the high-strength RC beam is basically the same as that of the ordinary RC beam when the peak overpressure value is small, and the strength advantage of the high-strength reinforcement has not been fully exerted. With the increase of explosion load, the maximum tensile strain and compressive strain of concrete at the mid-span section of high-strength RC beams are 46.6% and 43.5% of ordinary RC beams respectively. Under the action of high overpressure explosion load, the deformation of RC beams can be significantly reduced by high-strength reinforcement, which limits the development of cracks.