开展爆炸冲击波与碎片耦合作用下储罐易损性研究有助于提升化工园区的安全水平。基于能量密度与最大塑性应变准则，综合考虑爆炸冲击波和抛射碎片的作用顺序及强冲击荷载作用下钢材的应变率效应，建立爆炸冲击波与碎片耦合作用下化工储罐破坏失效的极限状态方程。通过有限元模拟对比分析储罐理论临界破裂速度与数值模拟结果，验证了方程的合理性。对5000m3立式拱顶储罐易损性结果分析可知：材料应变率效应可削弱爆炸冲击波与碎片耦合作用对化工储罐造成的破坏，降低储罐易损性；爆炸冲击波、碎片的作用顺序会显著影响储罐的失效概率，且碎片先于冲击波作用时储罐易损性更高；由单一变量分析可知，耦合作用下储罐的易损性与爆源强度、碎片撞击载荷均呈正相关，但与碎片撞击角呈负相关。研究结果对预防由爆炸冲击波与碎片耦合作用导致的多米诺效应事故发生及制定事故防控策略具有指导意义。

Studying vulnerability of storage tanks under the coupling effect of blast wave and fragment can contribute to improve safety level of chemical industrial parks. In the study, the failure limit state equation of chemical tank that subjected to the coupling effect is established based on the energy density rule and maximum plastic strain criterion, which considering the sequential action of blast wave and fragment and the strain-rate effect. Comparative analysis of the theoretical rupture velocity of the storage tank and the maximum speed that obtains by numerical simulation to verify the rationality of the equation. The analysis of the vulnerability of a 5000m3 vertical vault tank shows that the strain-rate effect can enable the tank less destruction of the combined loadings and reduce the vulnerability of the tank. The action sequence of blast wave and fragment significantly affects the failure probability of the tank, while fragment impacts the tank firstly is more dangerous than blast wave. Through a single univariate analysis shows that the vulnerability of the storage tank is positively correlated with explosive strength and impact loading of fragment, but it is negatively related to the impact angle of fragment. The study results are helpful for providing guidance for the prevention of domino effect accident subject to coupling effect of blast wave and fragment and formulating pre-control strategy.