scholarly journals Buckling resistance of concrete-filled cold-formed steel (CF-CFS) built-up short columns under compression

2022 ◽  
Vol 170 ◽  
pp. 108638
Author(s):  
Rohola Rahnavard ◽  
Hélder D. Craveiro ◽  
Rui A. Simões ◽  
Luís Laím ◽  
Aldina Santiago
Keyword(s):  
Short Columns ◽  
Buckling Resistance ◽  
Cold Formed Steel

Fire resistance of concrete-filled cold-formed steel (CF-CFS) built-up short columns

2021 ◽  
pp. 103854
Author(s):  
Rohola Rahnavard ◽  
Hélder D. Craveiro ◽  
Rui A. Simões ◽  
Luís Laím ◽  
Aldina Santiago
Keyword(s):  
Fire Resistance ◽  
Short Columns ◽  
Cold Formed Steel

scholarly journals The buckling analysis of a cold-formed steel C-sectional column resting on an elastic foundation

2018 ◽  
Vol 219 ◽  
pp. 02009
Author(s):  
Patryk Deniziak ◽  
Piotr Iwicki
Keyword(s):  
Elastic Foundation ◽  
Column Length ◽  
Load Bearing ◽  
Shell Elements ◽  
Elastic Supports ◽  
Buckling Resistance ◽  
Cold Formed Steel ◽  
Steel Trusses ◽  
Abaqus Software ◽  
Sectional Column

The paper is focused on stability analysis of different models of steel cold-formed C-section column. The analysed element may be applied as a primary load-bearing member in steel trusses or silo columns. The column can be used as a support for a wall of roof plates made of corrugated sheets. The wall sheeting that restrains the column against buckling may be considered as an elastic foundation. Due to the design solutions the foundation may be modelled as a series of lateral translational or rotational elastic supports. Such model is used for example in silo column analysis. In the paper linear bifurcation analysis (LBA) of axially compressed columns with different type of elastic foundation is carried by means of ABAQUS software. The analysed thin-walled column (C 250×100×33×4) is regarded as a load-bearing element in a steel hall. The column was modelled by shell elements, the foundation modelled by means of elastic supports. The column length was 5000 mm. The authors present a 3D image of an influence of lateral translational and rotational elastic supports on the buckling resistance of the column.

scholarly journals Buckling resistance of vertical stiffeners of steel silos for grain storage

2013 ◽  
Vol 12 (2) ◽  
pp. 189-196
Author(s):  
Paweł Błażejewski ◽  
Jakub Marcinowski
Keyword(s):  
Bulk Material ◽  
Numerical Approach ◽  
Nonlinear Analyses ◽  
Buckling Mode ◽  
Buckling Resistance ◽  
Linear Buckling ◽  
Steel Sections ◽  
Cold Formed Steel ◽  
Steel Silos ◽  
Linear Buckling Analysis

In steel silos fabricated from horizontally corrugated sheets, the vertical stiffeners (columns) sustain vertical forces as a result of friction of a bulk material against the silo wall. Columns are usually of cold formed steel sections. Due to the fact that stiffener failures are the most frequent cause of silos collapses, it is important to estimate accurately their resistance. The paper deals with numerical modelling of the elastic-plastic collapse of columns. Geometrically and materially nonlinear analyses (GMNIA) were carried out in which imperfections were taken into account. The imperfection forms were taken as a first buckling mode obtained in the linear buckling analysis (LBA). Amplitudes of imperfections were assumed as a =t, 2t, 3t, 4t, where t is the thickness of the stiffeners wall. It was revealed that the buckling resistance is very sensitive to the imperfection amplitude. All numerical analyses  were performed by the COSMOS/M system based on FEM. Buckling resistance of all analysed stiffeners was calculated also by means of formulae inserted in Eurocode PN-EN1993-4-1. Buckling resistances obtained by the proposed numerical approach were greater than their counterparts being the result of provisions inserted in PN-EN1993-4-1 and appear to be more realistic.

Effective design width for perforated cold-formed steel compression members

1998 ◽  
Vol 25 (2) ◽  
pp. 319-330 ◽  
Author(s):  
Nabil Abdel-Rahman ◽  
K S Sivakumaran
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Ultimate Strength ◽  
Experimental Studies ◽  
Element Model ◽  
Short Columns ◽  
Compression Members ◽  
Assumed Strain ◽  
Cold Formed Steel ◽  
Effective Design

Perforations are often provided in the web and (or) flange plates of beams and columns of cold-formed steel (CFS) structural members in order to facilitate duct work, piping, and bridging. This paper is concerned with the establishment of effective design width equations for the determination of the ultimate strength of such perforated members in compression. A proven finite element model has been used to study the effects of perforation parameters on the ultimate strength of perforated members. The finite element model consists of short columns of lipped channel CFS sections, discretized using nonlinear "assumed strain" shell finite elements, and utilising experimental-based material properties models. The parametric study covers web slenderness values between 31 and 194, perforation width to web width ratios up to 0.6, and perforation height to perforation width ratios up to 3.0. Effective design width equations for plates having square perforations and elongated perforations were developed. The efficiency and accuracy of these two equations in predicting the ultimate strength of perforated CFS compression members have been verified through a comparison with the ultimate load results of several experimental studies from the literature.Key words: cold-formed steel, compressive loads, local buckling, perforations, finite element analysis, experimental, post-buckling strength, ultimate strength, effective width, design.

Buckling resistance of axially loaded cold-formed steel columns

2016 ◽  
Vol 106 ◽  
pp. 358-375 ◽  
Author(s):  
Hélder D. Craveiro ◽  
João Paulo C. Rodrigues ◽  
Luís Laím
Keyword(s):  
Steel Columns ◽  
Buckling Resistance ◽  
Cold Formed Steel ◽  
Axially Loaded

Numerical Simulation of Cold-Formed Steel Stiffened Lipped Channel Columns with and without Perforations

2011 ◽  
Vol 243-249 ◽  
pp. 761-764
Author(s):  
Zhen Yu Wu ◽  
Yong Hong Yao
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Weighted Average ◽  
Element Model ◽  
Short Columns ◽  
Geometrical Imperfections ◽  
Cold Formed Steel ◽  
The Mean ◽  
Nonlinear Finite Element Model ◽  
The Finite Element Model

A nonlinear finite element model of fixed ended cold-formed steel stiffened lipped channel short columns with and without perforations was developed and verified against experiment results. Material and geometrical non-linearities were included in the finite element model. It was proved by comparison analysis that using weighted average tensile yield stresses of the flat and corner areas and the mean geometrical imperfections along the length of the specimens was suitable for predicting the failure mode, ultimate load and load versus displacement curves of the channel short column. The results got by FEA coincided with the experimental results.

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