常规武器对钢筋混凝土梁二次爆炸效应分析

An analysis of the damage effects of a second conventional weapon explosion on reinforced concrete beams

利用有升压时间的三角形荷载模拟构件受到常规武器爆炸产生冲击荷载作用，运用动力有限元程序计算3种典型跨长钢筋混凝土适筋梁在二次动载冲击下的破坏形态和动力响应；通过对比梁跨中正截面钢筋和混凝土应力应变的变化特征，分析其在二次动载作用下的破坏效应。最后，通过等效二次加载的响应给出了3种典型跨长钢筋混凝土梁二次动载的设计提高系数，研究成果可供设计参考。

The shock loading of conventional weapon explosion on structural elements is simulated through a trian- gle load with rise time. The failure modes and dynamic response of three ideally reinforced concrete beams with typical dimensions under a second impulsive loading are computed with the dynamic finite element program. The damage effects of a second dynamic loading are analyzed by comparing the stress and strain of the steel bars and concrete in the right mid-span section after the first and the second loading. Finally, through the response to the equivalent second loading, the enhancement coefficients for the design of the three reinforced concrete beams are proposed.