钢筋混凝土框架结构承重柱抗爆加固研究

Study of anti-blast reinforcement for the main column of reinfored concrete frame structures

总结了常用钢筋混凝土结构抗爆加固的方法，采用Ls—dyna有限元软件建立了框架结构承重柱“炸药-空气一结构”统一的流固耦合计算模型；使用先施加柱子初始应力、后施加爆炸荷载的静动载联合作用计算步骤，分析比较了不同的钢板厚度对典型承重柱抗爆加固效果的影响。结果表明，随着钢板厚度增大，柱的剩余承载力增大，损伤程度减小；利用损伤指数比较发现，5mm厚钢板加固对承重柱的抗爆性能提高幅度不大，建议使用10mm厚的钢板对钢筋混凝土承重柱进行加固。

This paper summarizes the common methods of anti-blast reinforcement for RC structures. A fluid-structure interactive numerical model is established using the finite element program Ls-dyna. In the calculation,the initial stress is applied first, and then the blast load. The influence of different steel plate thickness on the anti-blast reinforcement for the main column has been discussed. The results show that with the increase of steel plate thickness, the degree of damage of the frame column is reduced, and the residual axial compression capacity of the blast-damaged RC columns increases. Some comparative results using damage index show that reinforcement with 5-ram-thick steel plates contributes little to the anti-blast capacity of the main column. 10-mm-thick steel plates are recommended to use.