防爆墙设置对单层球面网壳结构抗爆性能的影响

Effect of explosion-proof wall on antiknock performance for single-layer reticulated shell

摘要:

为获得防爆墙设置下大跨网壳结构的抗爆性能，采用ANSYS/LS-DYNA分析软件，首先对设置防爆墙时爆炸冲击波的传播规律进行了有限元模拟和试验结果验证，从而确定流固耦合算法数值模拟的适用性；建立了包含网壳杆件、檩托、檩条、铆钉和屋面板的40 m跨度K8型单层球面网壳在外部爆炸荷载作用下的精细化有限元模型，提取结构在设置防爆墙时的动力响应结果，考察了防爆墙高度、位置和网壳矢跨比对结构动力响应的影响程度，总结了防爆墙及结构参数对冲击波绕流效应及冲击波在防爆墙与建筑物间反射效应的影响规律，提出存在“防爆墙危险高度”情况并给出具体数值，为指导大跨网壳结构合理的抗爆防御设计提供参考依据.

Abstract:

To analyze the influence of explosion-proof wall on antiknock performance for large-span reticulated shell structures, propagation of blast shock waves around explosion-proof wall was simulated with finite element software ANSYS/LS-DYNA. The ALE (Arbitrary-Lagrange-Euler) algorithm was determined due to good agreement with experiment. A kiewitt8 single-layer reticulated shell of refinement was established to simulate the dynamic responses of structure considering explosion-proof wall subjected to external blast loading. The response rules of the structure with varied height, position of explosion-proof wall and span ratio of reticulated shell were obtained to analyze the effects of explosion-proof wall and structure on circulating and reflecting action of blast shock wave. Dangerous height of explosion-proof wall including specific values was proposed, which could provide reference for reasonable defense design of reticulated shell structure.