Experimental and Rapid Calculation Method on the Dynamic Response of Stiffened Plates with Arc-Shaped Supports Under Underwater Near-Field Non-Contact Explosion

To evaluate the protective capacity of stiffened plates with arc-shaped supports (SPASs) under underwater near-field non-contact explosion (UNFNCE), a series of experiments were designed and conducted to investigate the dynamic responses of SPASs under varied explosion loads and structural parameters. A rapid calculation method based on an equivalent velocity field approach was established to analyze the energy absorption characteristics of SPAS under UNFNCE. Combined with energy analysis using the fast simulation results, a semi-analytical method was developed for predicting the dynamic response of SPASs. The results exhibit good agreement between predictions from the proposed methods and experimental measurements; both the fast calculation and semi-analytical approaches produce errors within commonly accepted engineering tolerances. These two methods can act as efficient and reliable tools for rapid dynamic response assessment of SPAS under UNFNCE, offering practical support for the anti-explosion design of ship protective structures.