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基于等效单自由度体系和分布参数体系研究了爆炸荷载作用下梁板结构在弹性阶段的反弹机理,给出了5种常用荷载作用下的单自由度弹性反弹曲线,进一步建立了典型加劲肋钢板有限元模型,对其在塑性阶段的反弹机理进行了数值模拟。研究结果表明:荷载作用时间越短,反弹越严重,相反,荷载作用时间越长,反弹越小;当荷载作用时间无穷大时,反弹抗力约为正向抗力的50%;荷载形式的改变对反弹影响较大;阻尼对结构的反弹影响显著,设计时建议按30%折减;当结构进入塑性阶段后,反弹效应减弱,反弹规律与弹性阶段类似。
Based on the equivalent single-degree-of-freedom system and the distributed parameter system, the bouncing mechanism of beam-slab structure under the action of explosion load is studied. The single-degree-of-freedom elastic bounce curve under five commonly used loads is given, and the typical stiffener The finite element model of steel plate is used to simulate the rebound mechanism in the plastic phase. The results show that: the shorter the loading time, the more serious the rebound, but the longer the loading time, the smaller the rebound; when the loading time is infinite, the rebound resistance is about 50% of the positive resistance; The effect of damping on the rebound of the structure is significant, and the design proposal should be reduced by 30%. When the structure enters the plastic stage, the rebound effect will be weakened and the rebound law will be similar to that of the elastic stage.