Genetic programming-based formulation for distortional buckling stress of cold-formed steel members

2008 ◽  
Vol 64 (12) ◽  
pp. 1495-1504 ◽  
Author(s):  
Murat Pala
Keyword(s):  
Genetic Programming ◽  
Distortional Buckling ◽  
Buckling Stress ◽  
Steel Members ◽  
Cold Formed Steel

Simplified Method for Elastic Distortional Buckling Stress of Cold-Formed Thin-Wall Steel Members

2012 ◽  
Vol 166-169 ◽  
pp. 3391-3398
Author(s):  
Yang Zhao ◽  
Wei Ming Yan ◽  
Cheng Yu
Keyword(s):  
Technical Specification ◽  
Effective Area ◽  
Thin Wall ◽  
Steel Buildings ◽  
Distortional Buckling ◽  
The North ◽  
Buckling Stress ◽  
Steel Members ◽  
Calculation Results ◽  
Similar Computation

For the distortional buckling of cold-formed thin-wall steel members, the Direct Strength Method (DSM) is a recently adopted design approach by foreign standard, and Chinese professional standard Technical specification for low-rise cold-formed thin-wall steel buildings present the calculation formulas based on the Effective Area Method (EAM) .The key of both methods is the elastic distortional buckling stress .At present, the calculation methods about it are over conservative .Compare the calculation results of method in AISI S100with the one calculated by software CUFSM ,for C and Z sections in bending and axial compression loading respectively in the North American Specifications for Cold-Formed Steel Structural Members (AISI S100). This paper presents revised simplified methods for calculating the elastic distortional buckling stress. The new methods yield more accurate results but similar computation cost compared to the existing methods.

Local Buckling of Cold-Formed Steel Members with Edge Stiffened Holes

2015 ◽  
Vol 725-726 ◽  
pp. 697-702 ◽  
Author(s):  
Marsel Garifullin ◽  
Darya Trubina ◽  
Nikolai Vatin
Keyword(s):  
Local Buckling ◽  
Buckling Analysis ◽  
Numerical Results ◽  
Building Industry ◽  
Elastic Buckling ◽  
Distortional Buckling ◽  
Steel Members ◽  
Cold Formed Steel ◽  
New Generation

Cold formed steel members with edge stiffened holes are a new generation of cold formed members recently developed by the building industry. Very little research has been performed on such sections to determine their local and distortional buckling capacity. This article provides the numerical results of elastic local buckling analysis of cold-formed lipped channels with edge stiffened holes. For flexural elements values of critical buckling moments are calculated and the influence of hole spacing and diameter on elastic buckling capacity is determined.

EWM-based design method for distortional buckling of cold-formed thin-walled lipped channel sections with holes

2022 ◽  
Vol 19 (1) ◽  
pp. 972-996
Author(s):  
Xingyou Yao ◽  
Keyword(s):  
Design Method ◽  
Effective Width ◽  
The Finite Element Method ◽  
Distortional Buckling ◽  
Buckling Strength ◽  
Channel Section ◽  
The North ◽  
Buckling Stress ◽  
Cold Formed Steel ◽  
Theoretical And Numerical Analysis

<abstract> <p>The distortional buckling is easy to occur for the cold-formed steel (CFS) lipped channel sections with holes. There is no design provision about effective width method (EWM) to predict the distortional buckling strength of CFS lipped channel sections with holes in China. His aim of this paper is to present an proposal of effective width method for the distortional buckling strength of CFS lipped channel sections with holes based on theoretical and numerical analysis on the partially stiffened element and CFS lipped channel section with holes. Firstly, the prediction methods for the distortional buckling stress and distortional buckling coefficients of CFS lipped channel sections with holes were developed based on the energy method and simplified rotation restrained stiffness. The accuracy of the proposed method for distortional buckling stress was verified by using the finite element method. Then the modified EWM was proposed to calculate the distortional buckling strength and the capacity of the interaction buckling of CFS lipped channel sections with holes based on the proposal of distortional buckling coefficient. Finally, comparisons on ultimate capacities of CFS lipped channel sections with holes of the calculated results by using the modified effective width method with 347 experimental results and 1598 numerical results indicated that the proposed EWM is reasonable and has a high accuracy and reliability for predicting the ultimate capacities of CFS lipped channel section with holes. Meanwhile, the predictions by the North America specification are slightly unconservative.</p> </abstract>

scholarly journals Behaviour of Cold Formed Built - Up Steel Compression Member

2019 ◽  
Vol 8 (4) ◽  
pp. 8409-8413
Keyword(s):  
Slenderness Ratio ◽  
Distortional Buckling ◽  
Cross Sectional ◽  
Buckling Modes ◽  
Steel Columns ◽  
Steel Members ◽  
Load Carrying ◽  
Cold Formed Steel ◽  
Ultimate Load Carrying Capacity ◽  
Sectional Shape

The use of cold-formed thin-walled steel structural members has increased in recent years. Especially, Cold-formed steel columns are widely used in the construction industry due to their lightweight, easy installation, erection and economy. The strength and efficiency of cold-formed steel profiles depends on the cross-sectional shape, which controls the three fundamental buckling modes: local, distortional and global. As most of their sections are open with only one symmetrical axis, they would likely fail by twisting and interacted with the other buckling modes such as local and distortional buckling. In order to improve the ultimate strength of columns, a built-up column section with distinct shape was selected from the detailed study of Literatures and three specimens of thickness 1.6mm were fabricated with different lengths 500mm, 600mm and 700mm. Consequently, buckling behaviour of built up steel members was investigated theoretically with Direct Strength Method (with the help of CuFSM) as well as experimentally and the results were compared with the buckling modes obtained numerically using ANSYS software and it is found that the ultimate load carrying capacity of the column increases with the decrease of slenderness ratio and finally a new innovative and economical column element was presented.

Distortional Buckling of Cold-Formed Steel Members

2006 ◽  
Vol 132 (4) ◽  
pp. 636-639 ◽  
Author(s):  
Gustavo Monteiro de Barros Chodraui ◽  
Jorge Munaiar Neto ◽  
Roberto Martins Gonçalves ◽  
Maximiliano Malite
Keyword(s):  
Distortional Buckling ◽  
Steel Members ◽  
Cold Formed Steel
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