Double-hull Oil Tankers Buckling Strength Analysis

Buckling is one kind of common failure modes of ship structures and is also more concerned in the field of ship design. According to the characteristics of components prone to buckling, developing reasonable and workable solution while without losing the economy, and optimizing the hull of the ship is the main direction of exploration for ship researcher, which is also the main content of this paper, details are as follows:1) Firstly, the paper introduced the basic theory of plate buckling, including the methods of buckling analysis and buckling characteristics.2) Researched the basic assumptions of double-hull tankers for buckling analysis and advanced buckling analysis as well as the theoretical basis of various factors.3) Rule calculations were done of two double-hull oil tankers according to the requirements of CSR, one is 319,000 tons VLCC with two longitudinal bulkheads; another one is 105,000 tons Aframax with one longitudinal bulkhead, finite element analysis and assessments were carried out based on the results of rule calculation. Different strengthening methods for buckling deficiency were made against different load cases, different positions and different characteristics, target vessels were finally optimized. The methods possess certain significance for design and development of such ships.4) Compiled a VB program for buckling strength assessment, buckling evaluation results of VB program and SDA results of this procedure were compared to prove the usefulness of this program. Through finite element analysis of a LPG carrier with double hull, this program is carried out in practical application. This program can help provide quickly and efficiently forecast to the hull structure strength.