Comparative analysis of HCSR based on ultimate strength of intact ships and residual strength in damaged condition

摘要

Safety factors are modified in computation of ultimate strength and hull girder loads in HCSR released in 2013. Calculations and checks of hull girder residual strength are newly added in Chapter 5 Hull Girder Strength. According to rules for hull girder load and calculation process of ulti mate strength in HCSR released in 2013, calculation procedures for hull ultimate strength are developed applying program design language FORTRAN based on Smith Method, considering properties of mate-rial yielding, buckling and post-buckling of structural elements. Ultimate strength of a bulk carrier which weighs 76000 tons is calculated, and residual strength of the damaged ship in the collision and grounding condition is evaluated. The vertical hull girder ultimate bending capacity is checked. Compared with models in collision and grounding condition in ABS and DnV rules, safety factors specified in criteria for residual strength and computational formulas of hull girder loads in HCSR set higher requirements.