Assessment of Average Compressive Strengths Effect of Stiffened

초록

Since average compressive strengths of stiffened panels are very important factors in prediction of hull girder ultimate strength by progressive collapse method, this paper investigates accuracy of average compressive strengths of stiffened panels on ultimate longitudinal strengths of hull girder. Average compressive strengths based on simplified CSR formulae and finite element analysis are calculated for 401, in total, stiffened panels used in midship section of a typical VLCC. Then hull girder ultimate strengths have been calculated using the in-house software UMADS which is based on the progressive collapse method with a new convergence criterion. Ultimate longitudinal strengths of intact section are assessed for various heeling conditions : from 0° (sagging) to 180° (hogging) with 15° interval. It is concluded that average compressive strengths from FEAs induce conservative prediction of hull girder ultimate strength, because CSR formulae estimate less conservative shortening behaviors of stiffened panels than FEA results.