Dynamic response simulation and damage analysis of upper structures of offshore platform under multi-point explosions
In recent years,there have been frequent occurrences of fire and explosion accidents on offshore platforms.The o-verpressure generated by explosions will cause damage to the platform structure.At present,numerical simulation for structures under explosion is limited to small-scaled key components of the platform or simplified cabin models under single point explo-sions.We focus on the typical upper deck and complex cabin of jacket platforms exposed to multi-point explosions.The simula-tion of the explosion process was carried out based on the Euler-Lagrange coupling algorithm.The influence of distributions of the equipment and the anti-blast wall on the propagation of explosion shock waves was studied.Then the propagation law of shock waves under multi-point explosions was studied,correspondingly,the dynamics response of the upper platform was ana-lyzed.Finally,the structural damage caused by different explosion scenarios was compared.The results show that in the case of the equal TNT mass,for different scenarios of two-point explosion and single-point explosion,the peak overpressure of the for-mer is 1.82 times that of the latter,while the maximum equivalent deformation and the maximum equivalent stress of the struc-ture are almost equal.However,when the numbers of explosive points are 3 and 2,respectively(the total TNT mass ratio is 1.68 times),the peak overpressure is almost equal,while the maximum deformation ratio of the structure is 2.88 times.
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