爆炸作用下钢筋混凝土-钢板组合梁动力响应分析

Dynamic responses analysis of steel-backed reinforced concrete composite beams subjected to blast loading

应用分层Timoshenko梁的非线性动力有限元法,对爆炸作用下内衬钢板的钢筋混凝土梁的整体动力响应进行分析,探讨了不同加固钢板厚度、不同作用荷载峰值、不同纵向受拉钢筋配筋率以及不同配箍率对组合结构动力性能的影响,得到了爆炸作用下内衬钢板的钢筋混凝土梁的动力性能。研究表明,钢板的加固可以明显降低结构挠度,增强结构整体抗力,相对于普通钢筋混凝土梁,钢筋混凝土-钢板组合梁能够承受更大的荷载作用,在分析组合梁的整体动力响应时应充分考虑纵向受拉钢筋配筋率,特别是配箍率的影响。

In this research,the overall dynamic responses of the steel-backed reinforced concrete beams were analyzed with the former proposed layered Timoshenko beam nonlinear dynamic finite element method. The effects of different thickness of steel plate,peak value of the loading,reinforcement ratio and stirrup ratio on the dynamic performance of the structure were discussed in detail. The dynamic performance of the steel-backed reinforced concrete beams subjected to blast loading was proposed. The steel plate anchored to the inside face of reinforced concrete can reduce the deflection of the structure greatly and strengthen the overall resistance of the concrete structure. The steel-backed reinforced concrete composite beams can undertake bigger loading than common reinforced concrete beams.Reinforcement ratio,especially stirrup ratio must be considered in analyzing the overall dynamic response of composite beams.