scholarly journals Experimental Investigation of Cross-Sectional Bending Capacity of Cold-Formed Steel Channels Subject to Local-Distortional Buckling Interaction

2019 ◽  
Vol 145 (7) ◽  
pp. 04019064 ◽  
Author(s):  
Jun Ye ◽  
Francisco J. Meza ◽  
Iman Hajirasouliha ◽  
Jurgen Becque ◽  
Paul Shepherd ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Distortional Buckling ◽  
Cross Sectional ◽  
Bending Capacity ◽  
Cold Formed Steel

scholarly journals Experimental Study and Direct Strength Method for Cold-Formed Steel Built-Up I-Sectional Columns under Axial Compression

2021 ◽  
Vol 2021 ◽  
pp. 1-22
Author(s):  
Xingyou Yao
Keyword(s):  
Finite Element ◽  
Axial Compression ◽  
Numerical Study ◽  
Experimental Results ◽  
Distortional Buckling ◽  
Cross Sectional ◽  
Direct Strength Method ◽  
Comparison Results ◽  
Cold Formed Steel ◽  
Interactive Buckling

The objective of this paper is to investigate the buckling behavior and design method of the ultimate strength for the cold-formed steel (CFS) built-up I-sectional columns under axial compression which failed in distortional buckling and interactive buckling. A total of 56 CFS built-up I-sectional columns subjected to axial compression were tested, and the different buckling modes and ultimate strengths were analyzed in detail by varying the thickness, the length, the spacing of screws, the end fastener group, and the cross-sectional dimensions of CFS built-up I-sectional columns. It was shown in the test that noticeable interaction of local and distortional buckling or interaction of local, distortional, and global buckling was observed for the built-up I-sectional columns with different lengths and cross-sectional dimensions. A finite element model (FEM) was developed and validated with experimental results. A further parametric study has been conducted including different cross sections and slenderness ratios for the built-up I-sectional columns. The load-carrying capacities obtained from the experimental and numerical study were used to investigate the feasibility of the current direct strength method (DSM) when DSM was applied to CFS built-up I-sectional columns. The comparison results showed that the current DSM is not safe for CFS built-up columns failed in distortional buckling and interactive buckling. Therefore, the improved design formulas were proposed, and their accuracy was verified by using finite element analysis (FEA) and experimental results of CFS built-up I-sectional columns subjected to axial compression.

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.

scholarly journals Distortional buckling critical sectional dimensions and effective length of cold-formed steel lipped channel members

2019 ◽  
Vol 136 ◽  
pp. 04047
Author(s):  
Guo Yanli ◽  
Hu Pengwen ◽  
Li Xiao ◽  
Yao Xingyou ◽  
Xu Bin
Keyword(s):  
Effective Length ◽  
Distortional Buckling ◽  
Cross Sectional ◽  
Stability Coefficient ◽  
Research Results ◽  
Buckling Stability ◽  
Cold Formed Steel

Based on the comparison on buckling stability coefficient between local and distortional buckling, the critical cross-sectional dimensions without considering the distortional buckling for cold-formed steel lipped channel members are put forward. Furthermore, the critical effective length of nonoccurrence of distortional buckling is presented. The research results show that the calculation of distortional bucking strength of cold-formed steel lipped channel members can be avoided by controlling the reasonable cross-sectional dimensions or the effective length.

BEHAVIOR OF FULLY ENCASED COLD FORMED STEEL JOISTS WITH/WITHOUT WEB OPENINGS: EXPERIMENTAL INVESTIGATION

2018 ◽  
Vol 5 (1) ◽  
Author(s):  
Hanadi Elkhansa ◽  
Adnan Masri ◽  
Zaher Abou Saleh
Keyword(s):  
Experimental Investigation ◽  
Energy Absorption ◽  
Failure Modes ◽  
Load Capacity ◽  
Composite Beams ◽  
Absorption Capacity ◽  
Cross Sectional ◽  
Web Openings ◽  
Flexural Failure ◽  
Cold Formed Steel

This paper presents an experimental investigation on the behavior of encased light cold-formed steel joists with/without web openings. The study is carried on two sets of composite beams constructed of cold-formed steel joists using I-beam built-up sections. The first set has no web openings while the second set has circular web openings. Each set consists of three beams with various steel section-concrete reinforcing ratio. The constant parameters included in this study are the cross sectional area of the specimen, distribution of web openings in the encased steel I-joist, and the compressive strength of concrete. The tests have been conducted by applying two concentrated identical loads. Consequently, a comparative study is carried out to compare between the behavior of specimens within one set, and a comparison between the specimens of the two sets. This comparison is related to strength, stiffness, ductility, energy absorption capacity and failure modes. Based on the testing results, it is concluded that, the load capacity of the composite beams without web openings is greater than that with web openings for the same steel ratio. But the existence of web openings in the encased steel joists enhances the ductility and the energy absorption of the composite beams. Also using cold formed steel I-joists in the composite beams allow the failure mode to be ductile flexural failure.

A Study on the Behaviour of Cold Formed Built - Up Steel Compression Member

2019 ◽  
Vol 1 (6) ◽  
pp. 225-234
Author(s):  
Thiyagu K ◽  
Elanchezhiyan R ◽  
Kanaka P ◽  
Ganamanikarnika N
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.

scholarly journals Experimental investigation of post-fire mechanical properties of Q235 cold-formed steel

2020 ◽  
Vol 150 ◽  
pp. 106651 ◽  
Author(s):  
Chong Ren ◽  
Liusi Dai ◽  
Yuner Huang ◽  
Wenfu He
Keyword(s):  
Mechanical Properties ◽  
Experimental Investigation ◽  
Cold Formed Steel

Experimental Study on Mechanical Behavior of Cold-Formed Steel Three Limbs Built-up Section Members

2010 ◽  
Vol 163-167 ◽  
pp. 651-654
Author(s):  
Tian Hua Zhou ◽  
Shao Feng Nie ◽  
Xiang Bin Liu ◽  
Guang Yi Li
Keyword(s):  
Experimental Study ◽  
Mechanical Behavior ◽  
Axial Compression ◽  
Local Buckling ◽  
Distortional Buckling ◽  
Torsional Buckling ◽  
Failure Characteristics ◽  
Compression Load ◽  
Cold Formed Steel ◽  
Flexural Torsional Buckling

18 specimens of cold-formed steel three limbs built-up section members are tested under axial compression load in this paper. The section forms are divided into two categories: A and B. Load-displacement (P-Δ) curves and failure characteristics of specimens are obtained. The results show that: As to section A members, the failure characteristics of LC, MC and SC series of specimens are flexural-torsional buckling, torsional buckling and distortional buckling, local buckling and distortional buckling. As to section B members, the failure characteristics of LC, MC series of specimens are flexural buckling, while local buckling and distortional buckling for members of SC series.

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