偏心爆炸荷载下网壳结构的动力响应分析

利用ANSYS/LS-DYNA动力有限元软件平台建立了包含网壳杆件、檩托、檩条、铆钉、屋面板、墙体和地面在内的40m跨度精细化典型K8单层球面网壳结构有限元模型,采用流固耦合算法对结构在内部偏心爆炸荷载作用下的动力响应进行了有限元数值模拟研究,得到了网壳结构在偏心爆炸荷载作用下的四种响应模式:结构无损伤、构件塑性发展、网壳大变形、泄爆型破坏。获得了不同爆炸点位置、杆件截面、矢跨比、支承条件、屋面板厚度等参数条件下的结构动力响应结果,通过对比分析,总结了各参数对结构动力响应的影响程度与规律,为网壳抗爆防御设计提供了依据。

Dynamic response of reticulated shell under eccentric blast loading

Dynamic finite element software ANSYS/LS-DYNA was used to set up a typical finite element model for Kiewitt8 single-layer reticulated shell which contained reticulated shell member, purlin hanger, purlin, rivet, roof boarding, wall and ground. The dynamic response of structure subjected to internal eccentric blast loading was studied by using ALE (Arbitrary-Lagrange-Euler) algorithm, four response types are defined, that is: No Impairment, Member Developing Plasticity, Large Deformation of Reticulated Shell and Destruction with explosion relief. The response rules of the structure under internal eccentric blast loading with different explosion point position, section size of reticulated shell member, rise-span ratio, supporting condition and thickness of roof boarding are obtained through the comparison of the plastic strain, the plastic development degree and displacement of structure. The result offers the theoretical basis for reasonable defense design of reticulated shell structure for resisting blast.