Analysis of Hull Girder Ultimate Strength and Residual Strength Based on IACS CSR‐H

Abstract

In order to express the safety level of hull structures, IACS Common Structure Rules of Bulk Carriers and Oil Tankers (CSR-H) makes new requirements of hull girder ultimate strength. Compared with original CSR (i.e., CSR-OT and CSR-BC), partial safety factors of hull girder ultimate strength in CSR-H have been partly modified, and new requirements of residual strength have been added in the rules for hull safety after grounded/collided damage. This paper compares the rule requirements of ultimate strength in CSR-H and CSR-OT/CSR-BC and explains the technical background of rule requirements. The hull girder ultimate strength is mainly analyzed by SMITH method in rule requirements due to fast and stable calculation results. This paper also uses nonlinear finite element method (NFEM) to explain the critical influence factors for hull girder ultimate strength implied in the rule requirements. Based on 5 typical Bulk Carriers and 4 typical Oil Tankers, the influence of hull girder ultimate strength and residual strength in CSR-H has been evaluated for ship building industry. The actual ship evaluation results can be used to instruct the new CSR-H ship design.

Structural Resistance of Simplified Side Hull Models Accounting for Stiffener Design and Loading Type

“…Experimental and numerical investigations on the ultimate strength of stiffened plates subjected to combined biaxial compression and lateral loads showed that lateral pressure enhanced the loadcarrying capacity when the lateral force restrained deformation, as investigated by Ma et al [6]. Further, the ultimate and residual strength of a hull girder based on IACS CSR-H,CSR-OT, and CSR-BC were compared in detail by Shi et al [7]. In a series of recent studies, more advanced analyses of stiffened ship structures subjected to impact phenomena were performed to identify structural damage caused by striking and stranding, including ship-ship collision accidents [8][9][10][11][12], ship grounding [13][14][15][16][17], and other forms of ship hull damage [18][19][20][21][22].…”