Flexural buckling performance of concrete-filled aluminium alloy tubular columns

Numerical Modelling and Design of Aluminium Alloy Angles under Uniform Compression

“…As can be seen the mean value and the coefficient of variation (COV) of the N u,Exp /N u,FE ratio is 0.99 and 0.03, respectively, denoting a very good agreement between the numerical and experimental results. The numerical results demonstrated quite low sensitivity of the cross-sectional response of angles to the initial local imperfection amplitude, while the factor of t/10 of the plate thickness provided the best agreement with the test results [31,37].…”

“…In line with past studies [23,30], the initial local geometric imperfection distribution pattern was assumed to be in the form of the lowest buckling mode shape and was incorporated in the models. Moreover, an initial imperfection sensitivity study was performed considering three fractions of the plate thickness, t: t/10, t/15 and t/50 [31][32][33]. In line with past studies [23,30], the local geometric imperfection amplitudes were taken as a function of the plate thickness, because the local buckling mode has a half-wavelength of the same order of magnitude as the thickness of the constituent plate elements [10].…”

“…Moreover, two types of heat-treated aluminium alloys were considered, namely 6063-T5 and 6082-T6, representing a typical normal strength and high strength heat-treated aluminium alloy, respectively. The material properties for 6063-T5 [38] and 6082-T6 [31] adopted in the present study are shown in Table 4. Note that ε u and ε f are the strain at ultimate stress and at fracture, respectively.…”

“…As can be observed, the 6082-T6 aluminium alloy has higher (almost doubled) yield strength, although, it exhibits less pronounced strain hardening behaviour and ductility than the 6063-T5 aluminium alloy. Stress-strain responses of 6063-T5 [38] and 6082-T6 [31] aluminium alloys adopted in parametric study.…”

“…Although, in some cases [30] the buckling response is characterised by torsion in the form of rigid-body rotation about the shear centre of the cross-section. This behaviour is usually coupled with major-axis [38] and 6082-T6 [31] aluminium alloys adopted in parametric study.…”