摘要
砌体填充墙广泛应用于工程建筑,为研究爆炸荷载作用下砌体填充墙的防爆性能,运用AUTODYN建立不同炸药量和不同爆距的墙体物理和数学模型,对爆炸荷载作用下墙体的动态响应过程和损伤破坏情况进行仿真计算和研究,进而得到了砌体填充墙的防爆临界状态并确定了一定爆距下的防爆临界药量,给出了爆炸荷载作用下砌体填充墙临界药量计算公式。研究表明,所采用的数值模拟方法能较好地模拟墙体的动态响应过程,砂浆的损伤破坏与实际较符合,对于中、远爆距,临界药量计算公式具有较高的准确性,可为墙体防护加固设计提供一定的理论依据。
Masonry filling wall is widely used in engineering construction.To study the explosion-proof performance of masonry filling walls under explosion load,AUTODYN software was used to establish the physical and mathematical model of the wall under the different explosive amounts.And distance,the material model,failure criterion,and calculation parameters were reasonably determined.The dynamic response process and damage condition of the wall under the blast load were studied by simulation calculations at different distances:0.5 m,5.0 m,10.0 m,20.0 m,and 30.0 m.And then the critical explosion-proof charge for the masonry filling wall was determined.Finally,the relationship between the critical charge and explosion distance for the masonry filling wall was presented.The research result shows that the numerical simulation method and the physical model used in this paper can simulate the dynamic response process of the wall well and the dynamic damage and failure were consistent with the actual situation.When the small charge is initiated at a short distance,the shock wave acts on the center of the masonry filling wall in the form of a spherical wave,and great deformation occurs at the local part of the wall.And when the large charge is initiated at a long distance,the shock wave acts on the facing blasting surface of the wall in the form of a plane wave.And the damaged state of mortar on the facing blasting surface and back blasting surface deepens obviously and the whole wall deforms greatly.The calculation formula of critical charge obtained by simulation is suitable for the case under medium and long explosion distance,which can provide a theoretical basis for the design of wall protection and reinforcement.In practice,under the strong shock wave,the wall of the new explosion-proof construction should use high-strength materials.And polymer materials could be sprayed on the wall to improve the anti-explosion performance of the existing wall.
作者
王丽琼
肖杰
WANG Li-qiong;XIAO Jie(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2022年第5期2461-2468,共8页
Journal of Safety and Environment
关键词
安全工程
砌体墙
爆炸荷载
动态响应
临界药量
safety engineering
masonry filling walls
blast load
dynamic response
critical charge
