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《Natural Gas Industry》 2014-01
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A dynamic response analysis of an extra-large LNG storage tank under blasting conditions

Weng Dagen;Ge Qingzi;State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University;  
It is essential to evaluate the security of an extra-large LNG storage tank with the capacity of more than 160thousand m3,however,such detailed studies have not been found in domestic and foreign literatures,and even the current foreign specifications can not meet the requirements for the security evaluation of such huge tanks under explosions.In view of this,according to the specific structure of a certain extra-large LNG storage tank in a case study,the Arbitrary Lagrangian Eulerian and Fluid-Structure Interaction were applied to make a numerical simulation of the explosion with a strength of 900kg TNT equivalence occurring at the dome center,the weakest point of this tank,on this basis,a dynamic response analysis was made of the tank under explosion.As a result,the initial peak and attenuation relationship were obtained of the explosive blast;the reliability of this tank′s load was compared and validated with the empirical formula.Thus,a detailed analysis revealed the law of structure damage and stress distribution of the containment shell under explosion as well as the concrete unit displacement and acceleration response.The following findings were concluded.First,after such an explosion with a strength of 900kg TNT equivalence,a deformation area with a radius of 3mformed at the dome center of this tank.Second,the explosion had a rather great impact around the explosion center with a radius of 25m.And finally,the ultimate bearing capacity of this tank is the strength of 900kg equivalence.The analysis results can provide references for making safety countermeasures or maintaining routine safe operation of an extra-large LNG storage tank.In the end,some proposals were presented for the anti-explosion design of LNG storage tanks.
【Fund】: 国家自然科学基金项目(编号:51178355);; 科技部国家重点实验室基础研究项目(编号:SLDRCE10-D-01)
【CateGory Index】: TE972;TE88
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