Performance of structures to simultaneous blast loading and fragment impact
- Publication Type:
- Thesis
- Issue Date:
- 2025
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In the current climate of uncertainty, protection of critical infrastructures against explosion is a significant design aspect to be considered. Steel-concrete composite (SCC) sandwich panels have proved superior performance in blast environments against far-field loading regimes. In close-in explosion scenarios, the synergistic damage potential from the simultaneous blast loading and fragment impact needs to be considered. As knowledge in this field is limited, an explosive test was performed to evaluate the performance and damage to the SCC panels exposed to cased charges detonated at a close-in scaled distance of 0.39 to 0.78 m/kg1/3. Subsequently, numerical studies were performed to examine the dynamic response and the corresponding failure modes of SCC panels to the combined loads, validated with experimental data reported. The numerical model demonstrated good agreement in damage patterns and structural deflections. Furthermore, a simplified approach was proposed to estimate the structural deformation of SCC panels subjected to the combined loadings. The model returned favorable match with the maximum deflection time history although the damage mode was not fully replicated in the panel. This study is significant in their relevance to the design of protective structures vulnerable to extreme loads induced by cased charges at a close-in loading regime.
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