Ultimate strength of welded aluminium stiffened panels under combined biaxial and lateral loads: A numerical investigation
Xintong Wang, Zhaolong Yu, Jørgen Amdahl
Abstract
The number and size of aluminium non-monohull ships have been steadily increasing over time. This raises growing concerns regarding their structural strength, especially considering the adverse effects of the heat-affected-zone (HAZ) on welding connections in aluminium structures. This paper investigates the ultimate strength of welded aluminium stiffened panels under combined biaxial compressive loads and lateral pressure through the application of numerical simulations. Altogether 360 cases are simulated with varied panel lengths, welding patterns and load combinations. The results are presented and discussed with respect to force end-shortening curves, failure modes and ultimate strength. Influences of the combined loads and HAZ effects are summarized. The numerical results are compared to two commonly used design methods in the marine industry, the International Association of Classification Societies (IACS) rule and the Panel Ultimate Limit States (PULS) approach. Their applicability to welded aluminium stiffened panels is discussed, and modifications are suggested with respect to the transverse loads, lateral pressure, and HAZ effects. • Investigating behaviour of aluminium panel under combined loads considering welding effects. • Comparing results of NLFEM simulations and predictions from design methods. • Identifying incomplete considerations of lateral loads in design methods. • Recommending potential improvements in the IACS rule to better consider transverse loads. • Proposing integration of welding effects into the IACS rule for aluminium structures.