1. Logistical Engineering University, Chongqing 401311;
2. The Fourth Engineer Scientific Research Institute of the Headquarters of the General Staff, Beijing 100036
In order to meet the practical needs of damage assessment of the steel-concrete composite beams (i.e. the composite beams in short) subjected to blast loading, tests of carrying load capacity of the composite beams were conducted compared with reinforced concrete beams. The carrying load capacities and failure features of the two kinds of beams were studied, and the experimental resistance curves and bending deformation limits as well as the resistance functions of them were obtained. Based on the equivalent single-degree-of-freedom motion equation of the composite beams, the pressure-impulse (i.e. P-I in short ) isodamage curves for assessing the damage status of them were got by means of the numerical simulation method. The research results show that the carrying load capacity, deformation limits, critical overpressure and critical impulse of the composite beams are higher than those of reinforced concrete beams, indicating that the former beams have better blast resistance.
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