Cold Formed Steel Stiffened Web Sections Behaviour (original) (raw)
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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.
Experimental Investigation of Cold-Formed Steel Section- Flexural Member with Triangular Web
The present paper work dealt with the investigation on the behavior of cold form steel built up I-section with triangular web corrugation at varying depth. The effect of web corrugation and h w /t w ratio on the flexural strength of cold formed steel (CFS) lipped I section was presented in this paper. The length of the specimen was kept constant for 2000 mm and h w /t w ratio was varied from 166 to 250 keeping all other parameters as constant. In total three specimen were experimentally tested under two point loading with triangular web corrugation by considering simply support condition. The experimental results are verified with finite element analysis using ANSYS software. The results obtained from test experiments and ANSYS software were compared with the predicted Indian Specifications (IS 801-1975). The experimental result shows that the flexural capacity of the triangular web was larger than flat web. Also the effect of h w /t w ratio on the flexural strength capacity was studied and discussed. Due to the provision of triangular web corrugation, there was no failure in shear zone or in web portion.
The objective of this paper is to study the flexural behaviour of cold formed I –section with triangular corrugation. The effect of parametric change on the flexural strength of cold formed steel (CFS) I section is presented in this paper. The web is corrugated at regular interval into a triangular shape along the length of the beam. Totally twelve specimens are theoretically and analytically analysed by changing depth of corrugation, hw also span. All specimens are numerically analysed under two point loading with simply supported condition. The theoretical results are verified with finite element analysis using ABAQUS software. Theoretical analysis is done with code provision of AISI S100-2007, AS/NZS 4600:2005 specification. Within the parametric study the effect of corrugation in web on the flexural strength capacity is discussed and presented.
Analyzing the Flexural Performance of Cold-Formed Steel Sigma Section Using ABAQUS Software
Sustainability
Cold-formed steel structures are a type of steel fabrication that is commonly employed in building construction. Before manufacture, they are designed precisely to the appropriate dimensions using the ABAQUS software. Both the strength of the cross-section and distortional buckling determine the load-carrying capability of the section. It was found that thin walls in some cold-formed sections suffered distortional buckling under light loads, and that these elements continued to be strong even after the members buckled. To prevent local buckling, stiffness is offered by the web part. There are several methods for determining the modes and elastic buckling stress. They are finite element analysis, finite strip analysis, and conventional Fourier series solutions. The thickness of the specimen and types of stiffener selection which influence the ultimate strength and deflection should be the issue in the design of the appropriate sigma section. The non-linear numerical analysis of the w...
Analytical and Experimental Study on Cold-Formed Steel Built-Up Sections for Bending
Materials
In the construction of steel structures, the two most common types of structural members are hot-formed and cold-formed members. This paper mainly describes the analytical and experimental research on the strength and characteristics of CFS bolted built-up sigma sections having different structural arrangements under bending. The cross-sectional dimensions for the parametric study were selected by the sizes available in the market. In this paper, ANSYS workbench software was used to perform FE modeling and observe the local, flexural, and interaction of these buckling. Then, experimental study was performed by varying the arrangement of open section beams between face-to-face and back-to-back, connected using bolts or fasteners different spacings. Further, we conducted bending tests on cold-formed steel built-up members having simple edge stiffeners in the middle. Comparing both analytical and experimental studies, the results indicate that the back-to-back connected built-up beam s...
Web Buckling Analysis of Cold Formed Built-Up I Section
Modern construction industry is aiming at incorporating cost effective, economic, durable and light weight sections in their construction practice. Cold formed steel sections due to its high post buckling strength and the above mentioned qualities have a become a favorite building material among engineers. Hence it is necessary to make an in depth study about the buckling behavior of cold formed steel sections to understand about the most economical design of light gauge sections. Even though studies on individual flexural members like channel sections, lipped channel sections, zed sections have been done there are a very few researches on built-up I sections which is a very important flexural member. In this study, cold formed sections under considerations are built-up I sections. Finite element analyses are used to investigate the web buckling behavior of various cold formed built-up I sections with and without web holes, under interior two flange and interior one flange loading conditions. Sections are made with similar cross sectional areas for comparison. The web holes are located at the mid-depth of the sections with a horizontal clear distance of the web holes to the near edge of the bearing plate. This becomes of great importance to study the effect of web holes on the strength of the sections so that a better precise design and economy can be maintained.
Distortional Buckling of Stiffened Cold-Formed Steel Channel Sections
This paper is concerned with distortional buckling of cold-formed steel channel sections by the semi-analytical complex finite strip method. The main purpose of this paper is to study the buckling behavior of cold-formed channel sections with extra longitudinal stiffeners at the end of flanges and also on the web. One of the most important purposes of this study is to investigate the optimum width of extra longitudinal flange stiffeners in cold-formed channel sections. Furthermore, the optimum position of longitudinal web stiffeners is calculated to maximize the distortional as well as local buckling strength of cold-formed channel sections. For validation purposes, complex finite strip method results are compared with those obtained by Generalized Beam Theory (GBT) analysis. Using the semi-analytical complex finite strip method, a comparison on the buckling behavior of unstiffened and stiffened cold-formed channel sections in local, distortional and global modes will be done.
Analytical and Experimental Investigation of Cold Formed Steel Sections under Bending
The primary interest of this project is to study the possible buckling occurrence on various cold formed steel closed sections like Box section, front to front Sigma and front to front Z-sections used as beams. Since the flexural load carrying capacity of the above mentioned sections under bending varies greatly with respect to its shape. In order to study different load capacity initially, a reliable finite element model was generated using the ANSYS software package to predict the flexural load above mentioned cold formed structural sections and to obtain a better understanding of the buckling failure behavior. For this purpose, a finite element model was developed using ANSYS. Theoretical study is done by using Euro code (EN1993 Part1-3) to determine the buckling behavior. Experimental study is performed by testing the specimen under bending. The Experimental investigation, theoretical investigation by Euro code (EN1993 Part1-3) and numerical investigation has been compared and concluded.
FLEXURAL BEHAVIOUR OF STIFFENED MODIFIED COLD-FORMED STEEL SECTIONS–EXPERIMENTAL STUDY
The present study deals with the enhancement of the flexural capacity of cold formed steel beams using stiffeners. Beams with two back-to-back lipped channel sections were tested with and without stiffeners. Four such beams were considered with depth 150 mm and thickness of sheets 1mm and 2mm. ISMB 150 was also tested and was used as a yardstick for comparison with equivalent cold-formed sections. All the sections were subjected to “Four point flexural test” to study their behaviour in pure bending. From this study it was found that strength and stiffness of sections made out of 2mm sheets can be substantially enhanced using stiffeners whereas for 1mm sheets the enhancement was not so profound, primarily due to very high propensity for local buckling. Moreover, beams of 2mm sheets exhibited stiffness comparable to ISMB 150 in the initial loading stage.