SHOCK WAVE PRESSURE DISTRIBUTION ON LARGE-SPACE STRUCTURES AND EXPLOSION VENTING UNDER BLAST LOADING

A numerical simulation model of the internal explosion in a large-space structure is established by employing fluid-structure coupling algorithm LS-DYNA. The wave pressure field of the large-space structure under blast loading is simulated using this model. Two problems, spatiotemporal asynchrony of shock waveforms and pressure distribution on structure surface, are solved by extracting the shockwave overpressure data of the finite points on structural surface firstly, then using the Proper Orthogonal Decomposition (POD) method. Two cases of blast pressure field distribution, closed roof and opening roof, are investigated. The numerical results show that: 1) in close roof case, such as cylindrical shells and arched structures, shockwave overpressure due to blast loading tends to accumulate at the top region of the roof, thus suitable hole arrangement on roof is beneficial to explosion venting; 2) Decreasing the panel strips width among the holes would effectively reduce the impact of the explosion on the structure with the same hole ratio. Finally, the explosion-proof and anti-explosion measures for large-space structures are put forward.