关键词: 目标储罐, 撞击荷载, 极限状态, 蒙特卡罗模拟, 易损性

Abstract: In chemical parks or plants,the vulnerability of vertical tank to impact loading can reflect its ability to resist the impact of blast fragments. The failure problem of vertical tank subjected to impact of fragments was defined as the vulnerability of target tank to impact loading,and the random parameter distributions of fragments were obtained. The failure limit state equation of target tank subjected to impact of fragments was established based on the maximum plastic strain criterion and the accuracy was validated. The vulnerability curves of target tank under impact of fragments were plotted by Monte-Carlo simulation. It was found that the impact velocity of fragments was the main factor affecting the dynamic response of target tank. The change of angle would significantly affected the destructive capacity of fragments when the impact angle was between 10ånd 40°. By random parameter sensitivity analysis,the tank material density and impact velocity had positive correlation with target tank rupture failure probability,while the target tank yield strength,wall thickness,the mass of fragments and impact angle had negative correlation with it. In order to reduce the vulnerability of the impact load when large vertical tanks were in stage of design and manufacture,the low density and high strength steel could be used,and the thicker ring plate could be selected as the tank wall under the premise of storage process requirements,construction capacity and economic budget et al.

Key words: target tank, impact load, limit state, Monte-Carlo simulation, vulnerability