爆炸作用下U形加劲肋加劲钢板结构的动态响应与破坏模式  

Dynamic response and failure mode of U-shaped stiffener stiffened steel plate under blast loading

作　　者：甘露 宗周红[1] 李明鸿[1] 钱海敏 林津 高超 Gan Lu;Zong Zhouhong;Li Minghong;Qian Haimin;Lin Jin;Gao Chao(School of Civil Engineering,Southeast University,Nanjing 211189,China;PLA 61489 Troops,Luoyang 471000,China)

机构地区：[1]东南大学土木工程学院,南京211189 [2]中国人民解放军61489部队,洛阳471000

出　　处：《东南大学学报（自然科学版）》2020年第2期207-214,共8页Journal of Southeast University：Natural Science Edition

基　　金：国家重点研发计划资助项目(2017YFC0703405);国家自然科学基金面上资助项目(51678141).

摘　　要：基于数值模拟方法对爆炸作用下钢板和加劲钢板的动力响应和破坏模式进行了研究.采用显式非线性动力分析软件LS-DYNA,利用ALE和FSI算法建立了考虑爆炸过程及冲击波与钢板相互作用的数值模型,并基于试验数据验证了模型的准确性和可靠性,分析了不同工况下钢板、板式加劲肋加劲板及U形加劲肋加劲板在爆炸荷载下的动力响应和破坏模式.结果表明:在局部爆炸荷载下,U形加劲肋与板式加劲肋沿着加劲肋纵向不均匀变形,导致加劲板变形并破坏;2种加劲肋均可有效抑制钢板中心位置的变形,且U形加劲肋效果更显著;加劲钢板的破坏程度与加劲肋数量密切相关,合理布置U形加劲肋数量可以显著减轻钢板的破坏;增加U形加劲肋端头隔板有利于提高钢板的抗扭性能,减小钢板的最终开裂破坏程度.The dynamic response and the failure modes of steel plates and stiffened steel plates under blast loading were studied based on numerical simulation methods. The explicit nonlinear dynamic analysis software LS-DYNA was used to establish a numerical model considering the explosion process and the interaction between the shock wave and the steel plate with the arbitrary Lagrangian-Eulerian(ALE) algorithm and the fluid-structure interaction(FSI) algorithm, and the accuracy and the reliability of the model were verified by experimental data. The dynamic response and the failure modes of the steel plate, the plate stiffener stiffened plate and the U-shaped stiffener stiffened plate under blast loading in different conditions were analyzed. The results show that under the local blast loading, the U-shaped and the plate stiffeners are unevenly deformed along the longitudinal direction of the stiffeners, resulting in the stiffened plate to deform and break. Both stiffeners can effectively suppress the deformation of the center position of the steel plate, and the effect of the U-shaped stiffener is more significant. The damage degree of the stiffened steel plate is closely related to the number of stiffeners. The reasonable arrangement of the number of the U-shaped stiffeners can reduce the damage of the steel plate under the blast loading. The increase of the U-shaped stiffeners end baffle is beneficial to improve the torsional resistance of the steel plate and reduce the ultimate cracking damage.

关 键 词：加劲钢板 爆炸荷载 数值模拟 破坏模式 

分 类 号：O383[理学—流体力学]