爆炸载荷下半潜式钻井平台月池结构动态响应

以某半潜式钻井平台月池结构为研究对象，基于一般耦合法建立拉格朗日与欧拉网格的耦合，计及应变率效应的影响，应用二阶精度求解器ROE算法结合等效当量TNT方法及理想气体状态方程，参考API规范要求设置多组计算工况，对月池结构在不同爆源高度及不同当量载荷下的动态响应进行了数值分析研究。研究发现：整体结构抗爆性能较好，未有结构发生破损失效。当爆源高度超过41.55m或当载荷增大时，对X方向月池内壁板格造成的冲击与变形损伤更大，该处结构在防爆设计时应重点考虑；平台沿Y方向的舱壁为主要吸能构件，占比最低为44.7%，当爆源高度降低时，吸能占比增加，当爆炸载荷增大时，吸能占比降低；沿X方向的舱壁吸能占比稳定约为24%。本文的研究对于评估平台结构抗爆性能，优化结构设计等方面具有一定的参考价值。

Study on dynamic response of moon-pool structure of Semi-submersible drilling platform under blast loading

In this paper, moon-pool structure of a semi-submersible drilling platform is taken as the research object. The couple effect of Lagrange and Euler grids are established based on the general coupling method. The effect of strain rate is taken into account. The calculation uses ROE algorithm in second-order precision solver combined with the equivalent TNT method and the equation of ideal gas. Multiple load cases are set according to specifications in API. Numerical analysis of the dynamic response of the moon pool structure under different blast point heights and different equivalent loads is carried out. The results show that, the overall structure has good antiknock performance and no structural damage. When the height of the explosion point exceeds 41.55m, the impact and deformation of X-direction inner wall of moon-pool are larger, so the X-direction inner wall of the moon-pool should be considered as the key point in the explosion-proof design. The bulkheads along the Y direction are the main energy absorbing members, accounting for a minimum of 44.7%. When the height of the explosion point decreases, the proportion of energy absorption increases gradually. When the load increases, the ratio of energy absorption decreases. The energy absorption ratio of the bulkheads along the X direction is about 24%. The research of this paper has certain reference value for evaluating the anti-explosion performance of the platform and optimizing the structural design of the platform.