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推导了钢筋混凝土柱在冲击荷载作用下弯曲型变形与直剪型变形两种单自由度模型动力反应计算公式,并尝试将构件几何尺寸、材料力学性能以及冲击荷载都作为随机变量,考虑荷载不同持时及不同峰值,用打靶法计算了一个实例构件在瞬时冲击荷载作用下的破坏概率,为初步判断构件的破坏模式提供依据。计算结果表明荷载持时与峰值是决定结构构件破坏模式的重要因素。
The formulas of dynamic response of two kinds of single degree of freedom models of bending deformation and direct shear deformation of the reinforced concrete column under impact loads are deduced. The geometrical dimensions, mechanical properties and impact load of the reinforced concrete columns are considered as random variables. Time-varying and peak-to-peak values, the failure probability of an example component under instantaneous impact load is calculated by shooting method, which provides the basis for judging the failure mode of component initially. The calculation results show that load duration and peak value are the important factors that determine the failure modes of structural members.