Stability and design of fixed-ended stainless steel equal-leg angle section compression members

Major‐axis buckling of pin‐ended stainless steel equal‐leg angle section members: FE modelling and design

“…This relationship may also be shown through the 𝑁 cr,F,𝑢 /𝑁 cr,F,𝑣 ratio, where the newly proposed term 𝛽 (as described in Section 6.1), which accounts for the reduction in buckling resistance due to the aforementioned interaction, varies with 𝑁 cr,F,𝑢 /𝑁 cr,F,𝑣 , with a maximum magnitude at 𝑁 cr,F,𝑢 /𝑁 cr,F,𝑣 = 1.0 and a minimum value at 𝑁 cr,F,𝑢 /𝑁 cr,F,𝑣 = 4.0. The aforementioned observations dictate the necessity for a new definition for 𝛽 compared to that proposed in [2] to capture the influence of different boundary conditions on the severity of interaction interactive buckling.…”

“…The conservative predicted resistances for low 𝜃 values, where compression is dominant, is due to the doublecounting of the same buckling mode (i.e. torsional and local buckling) [1,2]. In addition, the lack of consideration of interactive buckling, described in Section 4, leads to unsafe results.…”

“…austenitic, duplex and ferritic), considering a wide range geometries and load combinations. A summary of the material properties adopted in the parametric study is presented in [2]. In total, 2100 FE results were generated.…”

“…Throughout the parametric study, the two-stage Ramberg-Osgood material model [15,16] was utilised. For the hot-rolled stainless steel angles, a bilinear residual stress distribution with a peak value of 70 MPa was employed [2][3][4]. For the cold-formed stainless steel angles, the dominant bending residual stresses were assumed to be inherently captured in the material stress-strain curves, and were therefore not explicitly defined.…”

“…Angle section members are used in a range of structures, such as towers and trusses alongside the bracing systems in buildings and bridges. Their structural behaviour continues to pose challenges, with current design provisions in international standards known to have significant limitations [1][2][3][4]. New resistance functions for angle section members recently developed within the US [1] and European [2,3] design frameworks have led to substantial improvements in the consistency and accuracy of their loadcarrying capacity predictions.…”