Steel tanks are widely used in the storage of various chemical liquids, and the blast resistance of the tanks is very important because of the explosiveness of these liquids. To explore a feasible method to improve the blast resistance of steel tanks, the effect of polyurea coating on the blast resistance of steel storage tank is investigated in this paper. The responses of monolithic steel tanks and polyurea coated tanks under blast loads are studied by field blast experiments using TNT explosive, and the results shows that the polyurea layers are effective in reducing the maximum and residual displacements of the tank. Numerical simulations are performed and validated, and the deformation process and stress and strain distribution of the tanks are analyzed accordingly. The increase on the bending moment of the plastic hinge lines of the tanks and the increase of the area density of the cylindrical shell induced by the polyurea layers are believed to be the two main factors contributing to the displacement reduction effect of polyurea in this paper. The validated numerical model is used to study the influence of polyurea layer's thickness on the deflection of the tank, and a nearly inversely proportional relationship between the thickness and the maximum displacement is found. Three deformation modes of the tanks are identified when subjected to blast load with varying intensity and it is found that the displacement reduction effect of polyurea varies in different deformation modes.

钢制储罐广泛用于存储各种化学液体，并且由于这些液体的爆炸性，因此储罐的防爆性非常重要。为了探索提高钢罐抗爆炸性的可行方法，本文研究了聚脲涂层对钢罐抗爆炸性的影响。通过使用TNT炸药的现场爆炸实验研究了整体钢罐和聚脲涂层罐在爆炸载荷下的响应，结果表明聚脲层可有效减少罐的最大位移和残余位移。进行了数值模拟和验证，并相应地分析了储罐的变形过程以及应力和应变分布。罐中塑料铰链线的弯矩的增加和聚脲层引起的圆柱壳面积密度的增加被认为是造成聚脲位移减少效果的两个主要因素。验证的数值模型用于研究聚脲层厚度对罐变形的影响，并且发现厚度与最大位移之间几乎成反比关系。在不同强度的爆炸载荷作用下，确定了储罐的三种变形模式，发现聚脲的位移减少效果在不同的变形模式下变化。