Ultimate strength study of stiffened plate under complex loading with initial imperfections

作者：Zhang Jing^*; Shi Xinghua; Gu Xuekang

来源：Ship Building of China, 2013, 54(1): 60-70.

• Common structural rules
• Complex loading
• Double hull oil tankers
• Initial imperfection
• Nonlinear finite element method
• Stiffened plate
• Ultimate strength
• Ultimate strength analysis

The ultimate strength of ship stiffened plate with initial distortion imperfections under uniaxial compression and lateral pressure is studied to obtain the real ultimate capacity of structure by the nonlinear finite element method. Comparing the results of Smith's experiments that was carried out for the structural ultimate strength analysis and the progressive collapse method, the accuracy of nonlinear finite element method is analyzed. The stiffened plate models of a AFRAMAX double hull oil tanker designed by Common Structural Rules are analyzed, from which the one bay model (1/2+1/2) is chosen for the ultimate strength studied. The chosen model can simulate the influence of the transverse on the result, and the longitudinal boundary can model the influence of adjacent panels. The results of structure with initial imperfections under complex loading show that initial imperfections and lateral pressure reduce the ultimate capacity significantly. And the comparison with the results of Common Structural Rules indicates that the Common Structural Rules method is actually over-estimate the structure ultimate strength due to the neglect of the technologic imperfections and the real loading conditions.

• 出版日期2013