Behavior and Strength of Cold-Formed Steel Lipped C-Section with Track Under Compression (original) (raw)
Related papers
BUCKLING ANALYSIS OF COLD FORMED STEEL CHANNEL SECTIONS WITH AND WITHOUT STIFFENERS
IJTIMES, 2019
The Light gauge cold-formed steel sections being used extensively in residential, industrial and commercial building as secondary load bearing members since last three decadez. In this context a study is being made to analyses C Sections with and without stiffeners to arrive at design strength criterion in compression. The direct strength method of design for cold formed steel sections has been validated over the years through research and the same has been incorporated in the standard codes of practice in the countries like USA and Australia. ABAQUS and CUFSM has been extensively used to perform Finite Element analysis and Finite Strip method of thin walled cold formed steel sections and the results are compared to each other. The analysis is being done on CUFSM and ABAQUS. The design strength curves will be arrived at using direct strength method. This is because cold-formed steel sections have a very high strength to weight ratio compared with thicker hot-rolled steel sections, and their manufacturing process is simple and cost-effective. In this context, a study is being made to analyze C sections with and without stiffeners to arrive at design strength criterion in compression members. In this study, the behavior of C sections with and without stiffeners under the action of axial loads has been carried out with various thickness and depths. In ABAQUS, the loads are applied on both ends. The clamped end conditions are considered.
infrastructures, 2024
Cold-formed steel channel (CFSC) sections have gained widespread adoption in building construction due to their advantageous properties, including superior energy efficiency, expedited construction timelines, environmental sustainability, material efficiency, and ease of transportation. This study presents a numerical investigation into the axial compressive behavior of CFSC section columns. A rigorously developed finite element model for CFSC sections was validated against existing experimental data from the literature. Upon validation, the model was employed for an extensive parametric analysis encompassing a dataset of 208 CFSC members. Furthermore, the efficacy of the design methodologies outlined in the AISI Specification and AS/NZS Standard were evaluated by comparing the axial load capacities obtained from the numerically generated data with the results of four previously conducted experimental tests. The findings reveal that the codified design equations, based on nominal compressive resistances determined using the current direct strength method, exhibit a conservative bias. On average, these equations underestimate the actual load capacities of CFSC section columns by approximately 11.5%. Additionally, this investigation explores the influence of eccentricity, cross-sectional dimensions, and the point-of-load application on the axial load capacity of CFSC columns. The results demonstrate that a decrease in section thickness, an increase in column length, and a higher degree of eccentricity significantly reduce the axial capacity of CFSC columns.
Study on the flexural and compressive behavior of cold-formed steel sections with and without lips
In recent year's cold formed steel have achieved a considerable growth in construction field. Since they are light weight and easy to transport they are highly employed in steel structures rather than hot rolled steel. The cold formed steel can also be made in different desirable shapes and sections. In this paper different configurations of cold formed steel sections are employed as beams and columns. The sections include different configurations including lip, stiffeners and spacing between the webs. The beams are tested for flexural and torsional behavior whereas the columns are tested for compressive behavior. Initially the specimens were analytically analyzed using finite element software and then their results are compared with the experimental results.
2018
A simple method is proposed to predict the ultimate load of cold formed steel lipped channel columns. The proposed method reliability based on finite element method results of the cold-formed C- channel columns under axial load [1]. Numerical investigations of buckling behavior are accomplished by using FE software ANSYS 16 [2]. A parametric study for different cross sections is carried out covering a wide range of slenderness and web depth to thickness ratio for lipped channel columns. The comparison between results obtained from the numerical method (FEM) and the proposed method is achieved to validate the precision of the simple prediction method. Finally, the proposed method is implemented on the double lipped channel columns.
The paper presents the investigation on cold formed steel lipped channel columns experiencing distortional and global buckling interaction under axial compression. Five cross sections are chosen based upon the limitations given in the draft IS 801 code. The cross section dimensions and length ensures equal distortional/global critical buckling loads, thus maximizing the distortional/global mode interaction effects through elastic buckling analysis using CUFSM software. The plate slenderness ratio (b/t) is within the limit to avoid local buckling. The ends of the columns are considered as Pinned-Pinned. The Numerical analysis are carried out by the finite element package ANSYS. Finite element model include the geometric and material non-linearities. Geometric imperfections are incorporated in the model by extracting distortional and global modes obtained from buckling analysis. Parametric studies are carried out by varying the yield stress as 250,350 and 550 N/mm2.Theoretical Analysis are carried out by Direct Strength Method DSM-AISI 100-2007 and Australian Standard AS/NZS:4600-2005.The results are compared and the effect of distortional and global interaction on ultimate strength is discussed.
Comparative Study and Analysis of Cold Formed Steel Columns Subjected to Axial Loading
Cold formed steel are nowadays used for building construction especially non-load bearing partitions, curved wall etc due to its flexural strength, load carrying capacity and good appearance. In this paper detailed study of cold formed steel has been carried out to predict load carrying capacity of a column using Indian Standard IS 801-1975, British Standard BS 5950-5:1998, finite element software ABAQUS. A series of parametric tests were also carried out to compare the performance of different shapes of channel sections at various lengths (500mm, 600mm and 700 mm).The results indicate that the channel sections with intermediate stiffener carry greater load and show less deformation as compared to plain channel section and lipped channel section. The details of these investigation and the outcomes are presented in this paper.
NUMERICAL STUDY ON BEHAVIOUR OF COLD FORMED STEEL LIPPED ANGLE COLUMNS
This paper presents the numerical and theoretical study on the behavior of cold formed steel lipped angle column under axial compression. Three types of sections were chosen for this study are based on the geometric limitations for the pre-qualified sections provided in the North American Specifications for Cold formed steel structures (AISI S100 – 2007) The finite element models were developed by using ABAQUS 6.10 Software. Geometric and material non linearities were included in the model. The FEA was carried out by ABAQUS and these results were validated by the existing available experimental results. After the validation of the FEM, the parametric study was conducted by varying the cross section, thickness and yield stress. Theoretical study was carried out using Direct Strength Method in the North American Specifications for Cold formed steel structures. The parametric results were compared with the Direct Strength method. Based on the comparison of results suitable recommendations were suggested for the prediction of nominal strength of the equal angle column.
Compression tests on cold-formed steel built-up box sections
2019
Built-up box sections are becoming increasingly popular as column members in cold-formed steel (CFS) structures; uses of such sections include CFS trusses, space frames, and portal frames. In this paper, the built-up box sections are fabricated by two identical lipped channel-sections connected at their flanges with self-drilling screws. This paper presents an experimental investigation on the axial capacity of CFS built-up box sections. Compression tests were conducted for different values of slenderness’s covering stocky to slender columns. In total 8 built-up box columns were tested. For comparison, 8 single channel sections were also tested and reported herein. Prior to the compression tests, material properties and initial imperfections were measured for both the single channel and CFS built-up box sections. Load-axial shortening relationship, failure modes, and deformed shapes at failure are discussed for CFS built-up box columns. Test results show that all short columns faile...