Dynamic response and explosion relief of reticulated shell under blast loading

Dynamic finite element software ANSYS/LS-DYNA was used to set up the fine finite element model for Kiewitt 8 single-layer reticulated shell with a span of 40 m subjected to blast loading located at central point. The selection and determination of material parameters and constitutive models, element types, mesh dimension and generation and the application of symmetric structure were further validated to guarantee the precision and feasibility of dynamic analysis for finite element analysis. The response rules of the structure under blast loading with different rise-span rates, standoff distances and thicknesses of roof boarding were obtained through the comparison of the plastic strain, the plastic development degree and displacement of members. In addition, the effect of different opening rates, opening numbers, opening distributions and opening positions on roof boarding on the response of structure were also studied based on the explosion relief of roof boarding. The response results of long-span single-layer reticulated shell structure under central blast loading were summarized and the optimal layout scheme of openings on roof boarding was put forward, which offers the theoretical basis for reasonable defense design of reticulated shell structure for resisting blast.