Numerical Simulation Of The Protective Effect Of Net-type Explosion-proof Wall And New Dynamic Explosion-proof Wall

As a passive protection measure,the blast wall has been proved to be effective for structural protection.In recent years,much effort has been dedicated to improving the economic efficiency and aesthetic feeling of protective barriers.Apart from solid blast wall and sacrificial cladding,many types of protective barriers were proposed to provide structural protection.Based on the concept of wave interference,the fence type blast wall and net type blast wall were proposed to mitigating blast loads acting on the buildings.However,there is no information in the open literature on the protective mechanism of net type blast wall.Therefore,3D numerical simulation has been carried out in the following aspects:1.Comparative analysis of net type blast wall and fence type blast wall is carried out. The numerical model is validated by comparing the results of numerical analyses and field tests.The protective effectiveness of two types of blast walls is studied.It is found that net type blast wall perform better than fence type blast wall in overpressure reduction,but worse in impulse reduction because of the superposition effect behind the blast wall.2.The influence of relative opening fraction on the protective effectiveness of net type blast wall is investigated.The numerical results show that when the relative opening fraction decreases,a larger reduction in both overpressure and impulse is expected. However,a net type blast wall with a small relative opening fraction value is not suitable in economical efficiency and aesthetic feeling.3.A new dynamic barrier is proposed through adding rotating components in the net type blast wall.The protective effectiveness of new dynamic barrier and net type blast wallis compared.It is found that the proposed dynamic barrier performs better than net type blast wall in both overpressure and impulse reduction.The energy dissipation characteristics and parametric analysis of new dynamic barrier are also investigated.