Vol-1 Issue-2 2015 IJARIIE-ISSN (O)-2395-4396 1146 www.ijariie.com 71 Buckling analysis of cantilever pultruded I-sections using  ® Kunj J. Patel 1 , Satyen D. Ramani 2 , 1 M.E. student, Civil Engineering Department, SAL institute of technology and engineering research, Gujarat, India. 2 Asst. Professor, SAL institute of technology and engineering research, Gujarat, India. ABSTRACT For steel beam buckling analysis is a critical area of study to determine overall section capacity subjected to bending. Pultruded I-beams are manufactured using fiber and matrix composite lamina hence is usually orthotropic compared to conventional steel I-beams. Many researchers have studied the buckling characteristics of simply supported pultruded FRP beams for various types of loadings. In this paper an attempt has been made to study the buckling characteristics of cantilever beam subjected to point load at free end for WF(wide flange) & NF(narrow flange) section. The validation has been made with experimental data. Further the parametric study has been carried out to study the effect of fiber orientation along with fiber volume fraction on critical buckling loads. Keyword: - Pultruded I-beams, Fiber orientation, buckling characteristics, fiber volume fraction. 1. INTRODUCTION:- By decades the use of composite material is increased. By good knowledge of the fundamental properties of composites the rise of composites can be explained.FRP profiles have been used over more over past few years, due to high ratio of strength to weight. In the construction industry, recent applications have shown the structural and cost efficiency of FRP structural shapes, such as thin-walled open sections made through so-called pultrusion process. FRP beam and column offers great benefits in placement of composites with the help of lighter machine and initial haulage. It also offers the less schedule of maintenance and offer easy attachment of fittings, with FRP structures being engineered for a long service life. The physical and chemical properties of the composites make them a very attractive material option for selection particularly in more corrosive environments where traditional materials are known to deteriorate. To realize these benefits, the world of FRP requires demystifying, and the selection of these products made more easily understood. Pultruded profiles for commercial and structural applications which are produced by many manufacture the world. Most manufacturers produce custom profiles for commercial applications. A number of industry groups represent and loosely coordinate the activities of pultrusion manufacturers. Leading groups are the Pultrusion Industry Council of the European Pultrusion Technology Association (EPTA) and the American Composites Manufacturers Association (ACMA). Commonly produced pultruded profiles are usually available as wide-flange, I, rectangular tube, channel, square tube, plate materials and angle profiles. Standard profiles range from width to approximately 12 in. (300 mm) and 2 in. (50 mm) in height and have material thicknesses of two in. (6 to 13 mm).At this time there is no proper guidelines for the design of framed structures using either pultruded structural profiles as there are for concrete structures strengthened with FRP strengthening systems or reinforced with FRP rebar. However, two design manuals are developed: The Euro comp Design Code and Handbook (Euro comp, 1996) and The Structural Plastics Design Manual (ASCE, 1984). 2. LITERATURE STUDY:- M.M.Alinia, A.Dibaie, et al [1] studied buckling behavior of I-beams. The typical plated columns, one is 1m height and second is 4m height having similar section properties are considered. The web and flange width are assumed to be 1000mm and 300mm. The web and flange thickness is carried out 5mm and 30mm. During parametric studies for web and flange slenderness ratio, thickness is varied. Selections of flange and web thickness are as per limits defined in AISC360.The ABAQUS software is used in incremental nonlinear large displacement push over analysis.