Effect of corrugated steel angle on the damage characteristics and anti-explosion performance of corrugated steel-concrete composite structures

A three-dimensional refined numerical simulation model of a corrugated steel-concrete slab composite structure under contact explosion load was established by the finite element model and smoothed particle hydrodynamics(FEM-SPH) coupling method to explore the anti-knock properties of corrugated steel reinforced concrete slabs with different angles. The effects of corrugated steel angle on the dynamic response, damage evolution characteristics, damage mode, anti-knock property, and propagation mechanism of the shock wave in the composite structure were investigated, and the damage prediction and anti-knock property evaluation of the composite structure were carried out. The results show that the simulation results of the mid-span displacement of the corrugated steel are consistent with the experimental results, and the maximum error is 2.3%, which verifies the effectiveness of the contact explosion simulation process. The mid-span displacement, peak stress, acceleration at the center point, and energy absorption value of 90 degrees corrugated steel are 17.9%, 70.5%, 88.6%, and 59.4% lower than those of 30 degrees corrugated steel. The damage range of the composite structure gradually decreases with increasing angle of the corrugated steel. The failure volume of the concrete slab reinforced by corrugated steel with different angles decreases with increasing angle of the corrugated steel, and the energy absorption value of the composite structure increases with increasing of angle of the corrugated steel, mainly because the corrugated steel increases the number of reflections of the stress wave. The research results can provide a theoretical basis for the application of composite structures in the field of structural anti-explosion protection.