Study on dynamic response of open web sandwich plate under near field explosive load

As urbanization accelerates, the safety threats confronting buildings have grown increasingly severe, with terrorist attacks and accidental explosions occurring with greater frequency. Open-web sandwich plate structures, a novel structural form, have seen widespread application in engineering construction due to their advantages, including superior overall integrity, high stiffness, lightweight properties, large spanning capacity, space efficiency, aesthetic appeal, and facilitation of equipment and pipeline installation. However, the dynamic response mechanisms and blast resistance performance of such structures under near-field explosion loads remain critical topics requiring further exploration. To date, domestic and international scholars have primarily focused on theoretical analyses, quasi-static investigations, and seismic performance studies of open-web sandwich plate structures, with limited research dedicated to understanding the overall structural behavior of these systems under near-field explosion loads conditions. To mitigate the risks of explosions in open-web sandwich plate structures threatening human life, property safety, and causing adverse societal impacts, this study investigates the dynamic response of open-web sandwich plate structures under near-field explosive loads. A two-layer open-web sandwich plate structure was selected as the research subject. The finite element Coupled Eulerian-Lagrangian numerical simulation method was employed to analyze its dynamic response under near-field explosive loads, while simultaneously investigating the failure modes and underlying mechanisms of the structure. Through this investigation of two-layer open-web sandwich plate structures, a more comprehensive understanding of their dynamic response and failure mechanisms under actual near-field explosion loads is expected to be achieved. This research not only offers more effective guidance for enhancing the blast resistance performance of open-web sandwich plate structures but also provides a robust reference framework for the blast-resistant design of overall building structures.