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在冲击、爆炸等脉冲荷载作用下 ,地下防护结构的破坏形态比核武器作用下的要复杂得多 ,可能由原来的延性弯坏变为脆性剪坏。以常规武器作用下土中浅埋钢筋混凝土框架结构为背景 ,将其顶板简化为梁或单向板 ,并基于 Timoshenko梁理论 ,采用有限差分方法 ,分析了钢筋混凝土梁或单向板的早期动力响应 ,最后提出了一种爆炸脉冲荷载作用下钢筋混凝土梁或单向板破坏形态的弹性预报方法。计算分析结果表明 ,预报方法与试验观察结果基本一致 ,具有一定的工程实用价值。
Under the impact of impulse, explosion and other impulsive loads, the failure mode of underground protective structures is much more complicated than that under the action of nuclear weapons, which may change from ductile buckling to brittle shear damage. Based on the shallow-buried reinforced concrete frame structure under the effect of conventional arms, the roof is simplified as a beam or a unidirectional slab. Based on the Timoshenko beam theory, the finite difference method is used to analyze the early dynamic force of the reinforced concrete beam or one-way slab In the end, a method of elastic prediction of failure mode of reinforced concrete beam or one-way slab under explosive pulse loading is proposed. The result of calculation and analysis shows that the forecasting method is basically consistent with the experimental observation and has certain engineering practical value.