International Journal of Scientific Engineering and Science Volume 3, Issue 4, pp. 5-10, 2019. ISSN (Online): 2456-7361 5 http://ijses.com/ All rights reserved Analytical and Experimental Investigation of Cold Formed Steel Sections under Bending V. Chandrikka 1 , S. Shanmugavel 2 , B. Sivasurya 3 , B. Soundarya Lakshmi 4 , M. Praveen kumar 5 1 Assistant Professor, Department of Civil Engineering, Dhirajlal Gandhi College of Technology, Salem, Tamilnadu 2, 3, 4, 5 UG Students, Department of Civil Engineering, Dhirajlal Gandhi College of Technology, Salem, Tamilnadu Abstract—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. Keywords— Cold Formed Steel, various CFS section, Flexural Load. I. INTRODUCTION Cold Formed thin sheet steel products are extensively used in building industry, and range from purlins to roof sheeting and floor decking. Generally these are available for use as basic building elements for assembly at site or as prefabricated frames or panels. The thickness of steel sheet used in cold formed construction is usually 1 to 3 mm. Much thicker material up to 8 mm can be formed if pre-galvanized material is not required for the particular application. The method of manufacturing is important as it differentiates these products from hot rolled steel sections. Normally, the yield strength of steel sheets used in cold-formed sections is at least 280 N/mm 2 , although there is a trend to use steels of higher strengths, and sometimes as low as 230 N/mm 2 . The behavior of various CFS section subjected to bending is discussed in this paper. 1.1 Objective  To carry out the Experimental and analytical investigation of cold formed steel sections of sigma, z and box section under bending.  To study the structural performance of cold formed steel sections.  To reduces the dead load of the structure. 1.2 Scope The scope of the project is to reduce the dead weight. Theoretical, experimental results are compared with the ANSYS results and other scopes are  To obtain high performance structure on low cost.  To use a cost effective and light- weight materials in construction for easy fabrication and installation. II. LITERATURE REVIEW 2.1 Anna green Antony (2016). Cold formed steel sections are currently widely used as primary framing components and secondary structural systems. They are used as purlins and side rails or floor joist, and after that in the building envelops. The geometry can significantly influence the stability response of cold-formed steel members and their failure patterns. The section selected for the study is CFS sigma section. The behaviour of the sigma section and the effect of providing stiffeners are studied. Providing stiffeners can influence the ultimate load of the section. In this paper, inclined and transverse stiffeners are provided at the flange and their effect on the ultimate load is studied. 2.2 JunYe, ImanHajirasouliha, JurgenBecque (2018).This paper presents the results of a comprehensive experimental program aimed at studying the interaction of local and overall flexural buckling in cold-formed steel (CFS) plain and lipped channels under axial compression. The results were further used to verify the accuracy of the current design procedures in Euro code 3, as well as to evaluate the effectiveness of a previously proposed optimization methodology. A total of 36 axial compression tests on CFS channels with three different lengths (1 m, 1.5 m and 2 m) and four different cross -sections were conducted under a concentrically applied load and pin- ended boundary conditions. The initial geometric imperfections of the specimens were measured using a specially designed set-up with laser displacement transducers. Material tests were also carried out to determine the tensile properties of the flat parts of the cross-sections, as well as the cold-worked corner regions. A comparison between the experimental results and the Euro code 3 predictions showed that the effective width approach combined with the P–M interaction equation proposed in Eurocode 3 to take into account the shift of the effective centroid consistently provided safe results. Furthermore, the experimental data confirmed the results of an optimization study and demonstrated that the optimized CFS columns exhibited a capacity which was up to 26% higher than the standard