Abstract
Incremental explosive analysis (IEA) is addressed as an applicable method for performance-based assessment of stiffened and unstiffened cylindrical shells subjected to underwater explosion (UNDEX) loading. In fact, this method is inspired by the incremental dynamic analysis (IDA) which is a known parametric analysis method in the field of earthquake engineering. This paper aims to introduce the application of IEA approach in UNDEX in order to estimate different limit states and deterministic assessment of cylindrical shells, considering the uncertainty of loading conditions. The local, bay, and general buckling modes are defined as limit states for performance calculation. Different standoff distances and depth parameters combining several loading conditions are considered. The explosive loading intensity is specified and scaled in several levels to force the structure through the entire range of its behavior. The results are plotted in terms of a damage measure (DM) versus selected intensity measure (IM). The statistical treatment of the obtained multi-IEA curves is performed to summarize the results in a predictive mode. Finally, the fragility curves as damage probability indicators of shells in UNDEX loading are extracted. Results show that the IEA is a promising method for performance-based assessment of cylindrical shells subjected to UNDEX loading.
Highlights
Cylindrical shells play a main role as basic structural elements in the construction of marine and submarine structures
The Incremental explosive analysis (IEA) curves are extracted from the results
The incremental explosive analysis is established for performance-based assessment of stiffened and unstiffened cylindrical shells subjected to underwater explosion (UNDEX)
Summary
Cylindrical shells play a main role as basic structural elements in the construction of marine and submarine structures. Their relatively high stability against lateral pressure makes them a suitable choice for submerged pressure vessels and structures such as submarines and platform piles. Experimental studies play an important role in the extraction of design and analysis points in UNDEX related problems, but due to the very expensive and dangerous essence of these types of tests, they are confined to scaled-down specimens and limited in the variation of parameters. Both experimental and numerical methods are implemented in these studies.
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