Dynamic Gas Cloud Explosion Blast-resistant Structures Response

Vapor cloud explosion refers to the combustion or explosion process takes place after a mixture of combustible gases and air ignited in the atmosphere. Anti-blast structures refer to structures that resist the blast load and protect the security of people and property, usually made of steel and concrete. Vapor cloud explosion is one of the common accident happened during modern industry production, which caused big loss to life and property. The main method to avoid or reduce the loss is to set anti-blast structures. The foundation of reliable protection is to definite the dynamic response of the protection structure under vapor cloud explosion.Litter reaserch has carried on dynamic response and failure mode of the anti-blast structure under vapor cloud explosion. Also, the design method of conceret members under vapor cloud explosion remains unclear. How to selcet the design parameter of conceret members under vapor cloud explosion still has not come to an agreement. Based on fundamental theoy, this paper mainly used the method of numerical simulation. The following results have been achieved:1. The characteristic of gas cloud explosion that different from solid explosives is discussed. By calculating, the disadvantages of is pointed out. The adaptability of TNT equivalent weight method in this paper is verified.2. The failure mode of anti-blast structures under gas cloud explosion is researched. If the explosion load is relatively high, the structures may spall or even penetrate. The displacement in the middle range of concrete columns and the stress of steels inside the columns under gas cloud explosion are obtained.3. It shows that the peak value of explosion load has a great effect on the displacement in the middle range of concrete columns, but not on the stress of steels inside the columns.Choosing high-strength concrete will significantly improve the member’s antiknock performance. When the axial compression ratio of a column is increased, then its antiknock performance will be worse. Stirrup spacing has little influence on member’s antiknock performance.