The flexible perforated screens are a protection of buildings against external explosions

摘要

This work studies the parameters of the blast wave passing through a screen placed in its path. It determines the degree of pressure reduction behind the barrier depending on its permeability, the relative size of the obstacles, the length of the positive phase of the wave, the degree of removal of waves from the source. It also determines the size of the zone of decompression. Experiments are made with models of buildings that are located behind a barrier in the course of wave motion. These experiments gave grounds to conclude that such obstacles can serve as an effective explosion protection. It is proposed to use a flexible sheet as elements subject to blast load. It is shown that a sheet of soft steel, with a thickness of 1 mm and a length of 6000 mm can take a maximum load of 100 kPa. The strengthening of the sheet by increasing its effective thickness in proportion to extends its capabilities.