NFB700高强钢板抗震塌性能

为研究有较高屈服强度、良好韧性的NFB700高强钢板的抗震塌性能,对不同厚度的4种靶标开展了现场爆炸试验.通过对试验模型的毁伤状态观察及数据分析,研究高强钢板对靶标抗震塌能力的影响,并对混凝土-钢板双层结构的极限抗震塌性能进行数值仿真分析.研究结果表明:靶标的微应变大都随混凝土板厚度的增大而减小,而随距爆心远近而变化的...

Seismic Collapse Resitance of NFB700 High-strength Steel Plate

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.