Ajeet Sharma ¹, S. Senthil Selvan ¹, S. Suresh Babu ², D. Elango ²

Affiliations
1 Civil Engineering Department, SRM University, Chennai - 603203, Tamil Nadu, IN
2 Civil Engineering Department, Valliammai Engineering College, Chennai - 603203, Tamil Nadu, IN

Abstract

Cold-formed steels are made by rolling or pressing steel into semi-finished or finished goods at room temperatures. Cold-formed steel products are made by the working of steel billet, bar or sheet using stamping, rolling and including roll forming or presses to deform it into a usable product. Objective: By flexural-torsional behaviour channel section connected back to back. Four specimen of built up I section formed by using symmetric channel section connected back to back with the help of bolts provided in the web part of section. All the specimens were tested for flexural-torsional strength under two point loading. For this analytical study of cold-formed channel section four specimen of dimension of a 230 mm × 100 mm × 3 mm with a lip of 30 mm and 4 specimens of dimension of 180 mm x 50 mm x 1.6 mm with a lip of 20 mm and 1.8 m length were loaded vertically were unrestrained to allow flexural buckling. Method: The analytical investigation of the built up I section will be carried out using FEM modelling ANSYS. The theoretical values are calculated using IS 801:1975 and BS-5:5950. Findings: For the selected channel section with 230 mm and 180 mm depth the difference in theoretical, analytical and experimental results are found to be 2.5% and 4%. Application: Further this study can be carried out for steel section with increased or decreased depth of web and lip. It can also be used as a roofing sheet in warehouses etc.

Keywords

Back to Back Connection, Cold−Formed Steel, Flexural and Torsional Behaviour, Lipped Channel Section, Torsoinal Behaviour.

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Wasim Reza ¹, S. Senthil Selvan ¹

Affiliations
1 Department of Civil Engineering, SRM University, Chennai - 603203, Tamil Nadu, IN

Abstract

Background: Different products are manufactured from Cold Formed Steel (CFS) are used in the different field of our daily life; in the home, the shop, the factory, the office, the car, the petrol station. These products have many uses ranging from ‘tin’ cans to structural frame, building members. This investigation presents the analytical study and theoretical study of the behaviour of flexural strength of CFS sections. Methods: Analytical study of CFS section was done by using FEM software (ANSYS Multiphysics Utility – CIVILFEM). Here two Channel sections and two built up I sections are fabricated. Built up I sections are formed by using symmetric channel section with the help of bolts provided in the web part of the section. One of the built up I section and C section are provided with angle stiffener to increase the flexural strength. The analytical results are compared with theoretical results according to IS 801:1975. Findings: From the study it is found that the maximum moment are occurring in between the one third of span to two third of span of the subjected sections. The moment in the zone between the two point loads are same and that portion is known as pure bending zone. Flexural strength is increased by providing angle stiffener throughout the length of the sections at the spacing of 40 mm between two stiffener and for I section and Channel section total stiffeners are provided respectively 24 and 12. Applications: Further works can be focused on determining the behaviour of the channel and built up I section with increasing web thickness, flange thickness and increasing the stiffener dimension. Another useful can be done by using diagonal stiffener with the temperature effect which may change the behaviour of channel and built up I section.

Keywords

Build Up Section, Cold Formed Steel, Flexural Strength, Theoretical and Analytical Study.

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B. Vijaya ¹, S. Senthil Selvan ²

Affiliations
1 Department of Civil Engineering, Dr. M. G. R. Educational and Research Institute University, Chennai - 600095, Tamil Nadu, IN
2 Department of Civil Engineering, S. R. M. University, Kattankulathur, Chennai - 603203, Tamil Nadu, IN

Abstract

The present research work enable us to study the basic properties of concrete in which Manufactured Sand (M-Sand) is used as a partial and full replacement for natural sand. To retain the natural resource such as natural sand an attempt is made in this research by partially replacing the natural sand with M-Sand. To study the basic strength and durability characteristics of concrete, M30, M40 and M50 grades were selected. In the strength characteristic study, the compressive strength, split tensile strength and flexural strength were determined experimentally for the conventional and M-Sand concrete. In the durability study, the conventional and M-sand concrete is tested by conducting acid attack test, sulphate attack test and Rapid Chloride Permeability Test (RCPT). The experimental results revealed that the M-Sand replaced concrete have 20% more compressive strength when compared with conventional concrete for the 60% replacement of sand with M-sand (which found optimum). In the acid attack test, the percentage weight loss for conventional concrete is 2.65%, whereas for M-sand replaced concrete it is only 2% irrespective of grade of concrete. Low chloride ion permeability was observed for M-Sand concrete whereas moderate chloride ion permeability was observed for conventional concrete in RCPT test. The test results exhibits that the durability property of concrete is enhanced by partial replacement of sand with 60% of M-Sand for all the grades of concrete.

Keywords

Acid Attack, Compressive Strength, Flexural Strength, Manufactured Sand, Rapid Chloride Permeability, Sulphate Attack, Split Tensile Strength.

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M. Guru Agastheesh ¹, S. Senthil Selvan ¹

Affiliations
1 Department of Civil Engineering, Chennai, Tamil Nadu, IN

Abstract

Objectives: This paper presents the ultimate load carrying capacity and behaviour of Cold Formed Steel (CFS) starred section with different end conditions and the specimens are subjected to axial compression. Methods: Theoretical study is carried out by using Euler’s load equation. Six plain sections of different sizes of 2mm thickness were tested as short columns. The analytical study is carried out using FEM software. The specimen used for testing have different dimensions, 60×60×2mm and 50×50×2mm with welded end condition, balled end condition and bolted end condition. The specimens are also tested experimentally by applying axial compression loading. Findings: The analysis is numerically carried out using FEM software and the results are compared. The experimental investigation of the cold-formed steel column is carried out by testing the column under loading frame with load applied manually and the test results are found match with the theoretical values. Compression tests were carried out on cold-formed steel starred angles under different end connections. As a result, welded end condition provides more strength than balled end condition where balled end condition provides more strength than the bolted end condition. Applications: This results can be further used with different section size or with different end condition under different loading conditions to find the ultimate strength of cold formed steel.

Keywords

Axial Deformation, Axial Load, Cold−formed Steel, Eccentric Load, Starred Section

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