刚性防爆墙迎爆面荷载计算方法研究

防爆墙作为一种有效的防护措施在国内外重要工程中得到了广泛应用,研究防爆墙迎爆面荷载计算方法有助于防爆墙的科学设计和合理使用。该文采用数值模拟的方法,对不同倾斜角度刚性墙迎爆面压力荷载的计算方法及不同倾角墙体的抗爆效能进行了研究。分析了冲击波在垂直墙体、迎向以及背向炸药倾斜墙体上的反射、绕流以及荷载分布规律,总结出了不同工况时墙体荷载计算方法。研究发现背向炸药倾斜的墙体与垂直墙体以及迎向炸药倾斜的墙体具有几乎相同的防护效果,但墙体所承受的荷载要低于其他两者,合理的解释了工程中存在的防爆墙后倾现象的力学机制。

BLAST RESPONSE OF INCLINED RIGID WALLS

To effectively prevent the blast damage of buildings and structural elements through blast walls,an accurate prediction of the blast loads in terms of the peak pressures on blast walls is necessary.Numerical simulations were adopted to study the blast loads on blast walls with inclinations varying from 5°to 30°and their corresponding blast attenuation effects.Reflections and refractions of the blast wave from blast walls with inclinations were analyzed.The distribution and prediction equations of the blast loads on the blast walls were explored from the numerical analysis.It is concluded that the blast wave attenuation effects are similar for blast walls with different inclinations.When the blast wall is anticlockwise inclined,the maximum moment on the wall is much smaller,which reveals the mechanism of the anticlockwise inclined blast walls widely adopted in engineering.