论文部分内容阅读
随着棚洞应用数量的不断增加,其安全性和稳定性越发值得重视,然而在实际工程应用中棚洞被砸坏的案例仍是屡见不鲜。借助ANSYS/LS-DYNA有限元软件建立不同类型棚洞的有限元模型,并对滚石冲击下的不同结构类型棚洞的响应进行了数值仿真。研究表明:(1)滚石冲击荷载会使棚洞结构中产生冲击波,冲击波的传播会引起结构应力和变形震荡,门式棚洞比半拱式棚洞的震荡反应明显;(2)抗冲击性能方面,斜柱式棚洞比直柱式棚洞更优越,半拱式棚洞比门式棚洞有优势;(3)门式棚洞和半拱式棚洞在冲击作用下的结构最危险处都位于立柱顶部内侧。首次从结构角度出发研究棚洞的抗冲击性能,其成果完善了棚洞既有理论,并为今后棚洞的合理设计和施工具有重要的指导意义。
With the increasing number of shed holes, its safety and stability are more and more worthy of attention. However, cases of shed holes being damaged in actual engineering applications are still not uncommon. The finite element model of different kinds of shed holes was established with ANSYS / LS-DYNA finite element software. The numerical simulation was carried out to the response of different structure sheds under the impact of rolling stones. The results show that: (1) The impact load of rolling stone can cause the shock wave in the shed structure. The propagation of the shock wave can cause structural stress and deformation shock. The vibration of the gantry shed is more obvious than that of the semi-arch shed. (2) The impact resistance In terms of inclined column-type shed is more superior than straight-type shed, semi-arch shed has advantages over gate-type shed; (3) The most dangerous structure of the door-type shed and semi-arch shed Department are located inside the top of the column. It is the first time to study the impact resistance of sheds from the perspective of structure. The achievements have perfected the existing theory of sheds and have important guiding significance for the rational design and construction of sheds in the future.