scholarly journals Thin-Walled Cold-Formed Compressed Steel Members and the Problem of Initial Imperfections

2012 ◽  
Vol 40 ◽  
pp. 8-13 ◽  
Author(s):  
M. Al Ali ◽  
M. Tomko ◽  
I. Demjan ◽  
V. Kvočák
Keyword(s):  
Initial Imperfections ◽  
Steel Members ◽  
Thin Walled

scholarly journals Behaviour of thin-walled cold-formed steel members in eccentric compression

2018 ◽  
Author(s):  
Viorel Ungureanu ◽  
Maria Kotełko ◽  
Łukasz Borkowski ◽  
Jan Grudziecki
Keyword(s):  
Eccentric Compression ◽  
Steel Members ◽  
Cold Formed Steel ◽  
Thin Walled

The Influence of Imperfections and Nonlinearities on the Failure and B2 Stress Index of Thin-Walled Pipes

2015 ◽  
Vol 137 (6) ◽  
Author(s):  
Henry Schau ◽  
Lilit Mkrtchyan ◽  
Michael Geier
Keyword(s):  
Finite Element ◽  
Yield Stress ◽  
Plastic Material ◽  
Limit Load ◽  
Stress Index ◽  
Bending Moments ◽  
Plastic Buckling ◽  
Initial Imperfections ◽  
Thin Walled ◽  
Elastic Plastic Material

The effects of imperfections and nonlinearities on the failure mode and the B2 stress index of thin-walled straight pipes are investigated with finite element (FE) analyses. The analyses were performed for pipes made of an ideal elastic–plastic material and the austenitic steel X6CrNiNb18-10. The B2 index is calculated from the instability bending moments obtained by limit load analyses. The effects of initial imperfections as well as the D/t-ratio and the yield stress on the B2 stress index are studied. As a first result, it is noted that thin-walled straight pipes and imperfections fail due to local plastic buckling. Further analyses show that the type of imperfections, the ovality, the D/t-ratio, and the yield stress have significant influences on the B2 index. The obtained B2 indices for thin-walled straight pipes with D/t > 40 and possible technical imperfections are considerably higher than 1.0. The results have been compared with those of other investigations.

scholarly journals Koiter Asymptotic Analysis Of Thin-Walled Cold-Formed Steel Members

2015 ◽  
Vol 9 (4) ◽  
pp. 245-251 ◽  
Author(s):  
Viorel Ungureanu ◽  
Dan Dubina ◽  
Andrei Crisan ◽  
Antonio Madeo ◽  
Giuseppe Zagari ◽  
...  
Keyword(s):  
Experimental Study ◽  
Statistical Evaluation ◽  
Computational Cost ◽  
Limit Load ◽  
Imperfection Sensitivity ◽  
Critical Buckling Load ◽  
Steel Members ◽  
Cold Formed Steel ◽  
Thin Walled ◽  
Low Computational Cost

Abstract An imperfection sensitivity analysis of cold-formed steel members in compression is presented. The analysis is based on Koiter’s approach and Monte Carlo simulation. If the modes interaction is correctly accounted, than the limit load and the erosion of critical buckling load can be easily evaluated. Thousands of imperfection can be analysed with very low computational cost and an effective statistical evaluation of limit performance can be carried out. The analysis is done on pallet rack uprights in compression, based on an intensive experimental study carried out at the Politehnica University of Timisoara.

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