爆炸荷载下FRP加固双向板动力响应数值模拟

摘要

To study the explosive resistance of two-way reinforced concrete slabs strengthened with externally bonded fiber reinforced polymer (FRP) plates, a finite element software ANSYS/LS-DYNA was employed to simulate the two-way slabs under blasting loadings. For the two-way slabs, the analytical parameters include the carbon fiber reinforced polymer (CFRP) thickness, the distribution density of CFRP plates and the type of FRP plate. The calculation results indicate that under the same blasting loading, the blasting resistance of the CFRP strengthened two-way concrete slab increases with the thickness and its distribution density. However, based on the calculation results and considering economy and ductility performance, the CFRP thickness and the distribution density were optimized. For the same strengthening configuration, the FRP strengthened two-way slabs showed better blasting resistance than those strengthened by glass fiber reinforced polymer (GFRP). These results provide a valuable reference for the design of CFRP strengthened concrete structures under blasting loadings.%为了研究外贴FRP加固钢筋混凝土双向板的抗爆性能,采用有限元软件ANSYS/LS-DYNA对其在爆炸荷载下的动力响应进行模拟,比较分析了不同CFRP粘贴层数、粘贴密度和不同FRP材料对其抗爆性能的影响.结果表明,相同爆炸荷载下,随着CFRP粘贴层数和粘贴密度的增加,加固板抗爆性能不断增强,但考虑经济性和延性,CFRP粘贴层数和密度的选择具有最优值；相同加固模式的CFRP板比GFRP板抗爆性能更优越.可为钢筋混凝土加固结构抗爆设计提供理论参考.