Fluid - Solid Coupling Analysis Of Antiknock Structure Under Gas Cloud Explosion

Gas cloud explosion is one of the common accidents happened in daily life, which caused big loss to life and property. The anti-blast structure protection is the main way to reduce or avoid the loss. Clear dynamic response under gas cloud explosion is the foundation of reliable protection.The accurate prediction of the response under gas cloud explosion need FSI(fluid-solid interaction) to be considered. Based on fundamental theoy, research is carried out in this paper into the response of anti-blast structures in action of overpressure waves considering FSI through numerical simulation:1. The characteristic of gas cloud explosion is different from ideal explosion source, study the theory of gas cloud explosion and numerical analysis method for FSI.2 The characteristics of the TNT equivalent weight method were discussed and the applicability of the TNT equivalent method was proved in this study. Numerical simulation of the explosion process of unconfined gas cloud explosion was carried out to obtain the peak value of overpressure at different scale distance, compared the result with the empirical formula and the correctness of numerical simulation was verified.3. Using ALE method to simulate of the FSI between air and structure. It was researched that the rules of dynamic responses of the anti-blast structure under gas cloud explosion. Strength grade of concrete, the influence of concrete strength grade, reinforcement ratio, door and window opening and wall thickness on the structural dynamic response is analyzed.4 The results of considering FSI and not considering FSI were compared. It showed that the law of two calculated results was basically consistent, the difference of the peak overpressure on the structure surface was 2.6%, the peak value of equivalent stress with considering FSI was significantly larger than that without considering FSI, and the difference was 26.3%. Considering FSI, the peak velocity and the maximum displacement of the structure were greater than the results without considering FSI, the differences were 25.5% and 13.4%.