爆炸作用下钢柱动力响应快速评估方法

为了快速计算爆炸作用下钢柱的动力响应，针对不同爆炸荷载类型提出相应的计算方法：对于冲量爆炸荷载，将KARAGIOZOVA提出的上限法引入等效单自由度体系计算钢柱的局部和整体变形；对于准静态爆炸荷载，直接采用等效单自由度法计算钢柱的整体变形；对于动力爆炸荷载，采用建立的以局部和整体变形为评估指标的P-I曲线计算钢柱的变形响应。结果表明：提出的方法计算结果可靠，可应用于爆炸作用下钢柱动力响应的快速评估计算。

An efficient evaluation method for dynamic response of steel column under blast loadings

In order to calculate the dynamic response of steel columns under blast loadings efficiently, methods are proposed for different blast loadings. For the impulsive blast loading, an upper bound approach is introduced into the equivalent single-degree-freedom system to calculate the local and global responses; for the quasi-static blast loading, the equivalent single-degree-freedom method can be directly used to determine the global response; for the dynamic blast loading, a pressure-impulse diagram is established by using indices of local and global deformations to determine the dynamic responses of steel columns. The results show that the proposed method gives reliable predictions, and can be applied to the efficient evaluation of dynamic responses of steel columns under blast loadings.