Abstract: In order to study the seismic collapse resistance of NFB700 high-strength steel plate with high yield strength and good toughness, the field explosion tests were carried out on four targets. Through the observation of damage state of the test model and data analysis, the ability of high-strength steel plate to resist the seismic collapse of the target was studied. The numerical simulation analysis of the ultimate seismic collapse resistance of double-layer concrete-steel structure is carried out. The results show that the micro-strain of the target mostly decreases with the increase in the thickness of concrete slab, but the change of the micro-strain with the distance from the explosion center is not obvious, and the target with high-strength steel plate and thicker concrete slab has fewer cracks and finer cracks on it. And most of them have surface cracks. The target with ordinary steel plate has more cracks on it, of which are wider and longer, with the maximum length of 770 mm; as the thickness of concrete slab increases, the deformation of high-strength steel plate on the back decreases successively, and the concrete crater depths decrease successively; the deformation of the ordinary steel plate target is about twice that of equal thickness high-strength steel plate target, the overall deformation is V-shaped, and the center of the concrete is completely broken, indicating that the use of high-strength steel plate as the back plate can greatly improve the seismic collapse resistance of the target; For the structure of using 8 mm-thick high-strength steel plate as the back slab and reinforced concrete composite structure, the seismic collapse coefficient is about 0.147.

Key words: steelplate, explosiontest, numericalsimulation, seismiccollapseresistance, explosivecenter, explosioncrater