Abstract This paper investigates the lateral‐torsional buckling of built‐up cold‐formed steel beams featuring two or three component C‐ sigma‐sections arranged to have a closed loop. Several thicknesses each cross‐section with nominal yield stress values 450 MPa and 550 were tested obtain lateral strength data for range slenderness values. Complementary reference tests conducted on same section...

Buckling transitions in superhelical DNA are sudden changes in shape that accompany a smooth variation in a key parameter, such as superhelical density. Here we explore the dependence of these transitions on the elastic constants for bending and twisting. A and C, important characteristics of DNA's bending and twisting persistence lengths. The large range we explore extends to other elastic mat...

Parametric optimization problem of cross-sectional sizes for cold-formed C-profiles subjected to central compression has been considered by the paper. formulated as follow: define optimum taking into account post-buckling behavior and structural requirements when stripe width thickness well type profile are constant defined designer.
 Criterion load-bearing capacity maximization assumed pu...