BUCKLING ANALYSIS OF COLD FORMED STEEL CHANNEL SECTIONS WITH AND WITHOUT STIFFENERS (original) (raw)
Related papers
CFS Section is widely used in structural system. As we know that the CFS is light gauge steel section. Also cold formed steel sections are economic due to its low weight than the hot rolled section. There is need of checking buckling behavior of cold formed section. So, economic section can develop by considering these different conditions. For this study buckling mode is observed for different length by keeping section thickness and cross section constant. Also the load carrying capacity is calculated by using abaqus software for different length of section.
FLEXURAL BEHAVIOUR OF LIGHT GAUGE COLD FORMED STEEL MEMBERS : COMPARISON OF IS CODE AND EURO CODE
Light – gauge steel evolved as a building material in the 1930's and reached large scale usage only after the Second World War. In comparison with conventional steel construction, where standard hot rolled shapes are used, the cold formed light gauge steel structures are relatively new development. This paper presents a study on behaviour and economical of cold formed steel (CFS) built up channel section using different codes. This paper provides an experimental investigation for the bending strength of Cold – Formed light gauge steel plain (stiffened) rectangular sections. The test specimens were brake pressed from high strength structural steel sheets. In addition, the test strengths were compared with the design strengths calculated using the Indian Standard and Euro codes Specification for Cold –Formed steel structures. Flexural members are linear members in which axial forces act to cause elongation (stretch). The theoretical data are calculated using Indian Standard code IS 801-1975 and the section properties of the specimens are obtained using IS 811-1975. The specimens are designed under uniformly distributed loading with simply supported condition. The research project aims to provide which code of practice given more economical, high bending strength, more load carrying capacity and high flexural strength. The studies reveal that the theoretical investigations limit state methods (SI method) have high bending strength, high load caring capacity, maximum deflection and minimum local buckling& distortional buckling compare to the other codes.
Cold-formed steel is used in large number of products. For example in metal building construction, for wall coverings, floor decking etc. Cold-formed steel is a basic component in construction of lightweight prefabricated structures like stud frame panels, trusses and portal frames.The Cold formed steel term itself make it different from hot rolled steel due to difference in manufacturing methods. Typically columns, beams and angles etc. are different globally. At room temperature cold formed steel members are formed by bending flat sheets. Cold formed steel sections mainly created using two methods those are break press through and rolling. Where hot rolled steel members are precasted. Therefore cold formed steel sections can be easily available at any place where hot rolled sections are not available. The cold formed steel components can be used for larger and complex structures. The Comparison of cold formed steel section and Hot rolled steel section of equal cross sectional area is done in this research paper. Sections were experimentally tested under axial compression in universal testing machine. Simultaneously, ultimate compressive strength of cold formed members and hot rolled members has been investigated. Also, different properties of the sections such as stresses induced in the sections, strain in the section, axial deflection, and lateral deflection are obtained experimentally. For measuring strain experimentally strain gage foils were used. The validation of results is done by preparing finite element model in ABAQUS software. From experimental work it is observed that cold formed steel sections has more load carrying capacity as compared to hot rolled steel section.
This paper investigates the behaviour of different types of cold-formed steel members in compression of built-up back-to-back lipped channel cross-sections. Previous research on specimens in compression, made by Rondal and Niazi (1992, 1993) based on the formulas given by Johnston (1971) for spaced hot-rolled columns in which the battens (e.g. stitches) are attached to the chords by hinged connections, have provided recommendations to calculate the buckling resistance of such cold-formed built-up members; these are the only existing design recommendations for such specimens. Dubina et al. (2002b) reconfirmed, via numerical investigations, the analytical formula proposed by Rondal and Niazzi. In case of members in bending there are no particular design rules excepting the fact the distances between stitches must be appropriately sized in order to comply with built-up section conditions. Three types of back-to-back lipped channel cross-sections will be investigated, e.g. (a) back-to-back cold-formed steel columns connected with bolts; (b) back-to-back cold-formed steel columns connected with bolts and gussets; (c) back-to-back cold-formed steel columns connected with bolts, using stitches.
Investigation of the Strength of Cold-Formed Steel C-Section in Compression
2014
Cold-Formed Steel (CFS) may be considered as one of the excellent construction materials because it exhibits efficient load carrying capabilities in combination with its lightweight characteristics. However, there is a dearth of knowledge about the structural performance of locally-produced CFS in the Philippines and yet it is used for structures by just simply following foreign standards and guides. The objective of this study is to verify experimentally and computationally the performance of C-shaped Cold-Formed Steel (CFS) when subjected to concentric axial compression load considering buckling. The experimental aspect subjects the CFS members with compressive loads using hydraulic jacks and load cell. For the computational aspect, provisions found in the NSCP were used to determine the strength in compression of the members based on the actual dimensions, thicknesses and lengths of the member together with the material properties of the steel. This was done to a total of 126 sam...
Buckling Behaviour of Cold Formed Steel Channel Section
In the field of structural engineering the design of cost efficient structure is highly important. This led to development of cold-formed steel structures. Cold formed steel members have been widely used in residential and commercial buildings as primary load bearing structural elements. They are often made of thin steel sheets and hence they are more susceptible to local buckling. The present study focuses on understanding the importance of “lip” in cold formed steel sections. As per IS: 801 - 1975, design solution is developed for flexure member design. An experimental program is performed, to gain information on flexural capacity and buckling behaviour of member. Suitable finite element models are then developed to simulate the behaviour of tested beams and are validated using test results. All the ultimate load capacity results for local buckling are compared with codal provisions as well as results obtained by experimental program. This paper mainly focuses on to investigate load carrying capacity and buckling behaviour of two different cold formed steel channel sections i.e., with lip and without lip, by analytically(by developing design solutions),experimentally as well as by finite element analysis(by using ABAQUS software).The „lip‟ is not taking part anywhere in calculation of bending moment capacity. It is important regarding to buckling behaviour of cold formed steel sections. All the specimens are tested under Universal Testing Machine (UTM) and subjected to two point load system. Results are showing that members subjected to pure bending, with „Lip‟ channel section is subjected to web buckling. Channel sections with 'lip' is showing 28.7% higher than without 'lip' sections. In contrast, without „Lip‟ channel section is subjected to flange buckling. With „lip‟ channel section has high load carrying capacity compared to without „Lip‟ channel section. Analytical, experimental and finite element results are showing close to each other.
Experimental Study on Flexural Behaviour of Cold Formed Steel Section
Cold-formed steel members are extensively used in the building construction industry, especially in residential, commercial and industrial buildings. This paper presents an experimental and numerical study on the flexural behaviour of cold formed steel built-up section. Two built-up specimens were made using channel sections one with lip and the other without lip. The dimension of the channel is 200x80x2 mm. The length of the beam is kept constant for 1.25 m. All specimens are experimented under two-point loading with simply supported condition. The experimental result shows that the flexural capacity of the built-up cold formed steel beam with lip was higher than the beam without lip. The experimental results are also verified with finite element analysis using ABAQUS software. The analytical results obtained are in good agreement with the experimental results.