基于TNT当量法的储罐内爆压力简化计算与应力分析

以立式拱顶储罐为研究对象,综合考虑储罐内气体容积与几何结构的影响:依据TNT当量法推导了内爆载荷下储罐超压计算公式并计算得到了储罐内不同起爆点下的超压分布曲线.当起爆点在储罐中轴线时,罐顶或罐底压力约为相反侧的6倍;当起爆点在靠近罐壁一侧时,靠近爆炸点一侧的罐顶或罐底压力约为相反侧的30倍.最后,通过储罐内爆载荷下的动力学仿真计算,对储罐在不同起爆点和不同液位的破坏情况进行了评定.有限元计算结果表明:储罐在操作过程中应控制其液位在半罐以上,可保证在任意起爆点位置罐顶均先与罐底发生破坏.

Simplified Calculation of Tank Explosion Pressure Based on TNT Method and Stress Analysis

Vertical vault storage tank was studied as the project.The formula of overpressure under the tank implosion was derived according to TNT equivalent method.Which was considered the impact of the gas volume and the tank geometry.Then the overpressure distribution curves of different initiating points in the tank were calculated.When the ignition point is in the axis of the tank,the top or the bottom pressure is about 6 times as much as the opposite side of the tank.When the ignition point is close to one side of the tank shell,the top or the bottom pressure near the explosion point is about 30 times as much as the opposite side of the tank.Finally,the implosion dynamics simulation tank under load calculations in different initiation point of the tank and a different level of destruction was evaluated.The finite element calculation results show that:It can be ensured that the roof of the tank at any point of initiation can be damaged if liquid level was in more than half of the tank.