Mr.Madan M. Awatade.et al. Int. Journal of Engineering Research and Application www.ijera.com ISSN : 2248-9622, Vol. 6, Issue 6, ( Part -5) June 2016, pp.15-24 www.ijera.com 15 | Page Finite Element Modeling for Effect of Fire on Steel Frame Mr.Madan M. Awatade 1 , Dr.C.P.Pise 2 , Prof.D.S.Jagatap 3 , Prof.Y.P.Pawar 3 , Prof.S.S.Kadam 3 ,Prof.C.M.Deshmukh 3 , Prof.D.D.Mohite 3 . 1 PG Scholar, Department of Civil engineering, SKN Sinhgad College of Engineering, Pandharpur 2 Associate Professor, Department of Civil Engineering, SKN Sinhgad College of Engineering, Pandharpur. 3 Assistant Professor, Department of Civil engineering, SKN Sinhgad College of Engineering, Pandharpur. ABSTRACT This research is intended to be preliminary study lending to the detailed behavior of steel member i.e. Plane Frame. This paper shows the behavior of steel structures in fire the use of steel in building construction and its behavior when exposed to fire is presented. Fire performance of structural steel at elevated temperature includes the study of steel frame subjected to fire. Also the effect of stress strain temperature on the fire performance of structural steel should be observed. The behavior of a steel frame in a fire depends on many factors including the properties of the steel and the coating material on it. Computer application based on ANSYS software used to study the various parameters affecting the overall behavior of steel structures in fire is presented. The present paper shows the effects of stress–strain relationships on the fire performance of steel frame exposed to uniformly increasing temperature when steel is unprotected and protected with concrete using FEM. Key words: Steel frame, Elevated temperature, Fire performance, Stress-Strain, Finite Element Model (FEM). I. INTRODUCTION Structural steel has been widely used throughout the world. It is one of a designer’s best options in view of its advantages over other materials [1]. Steel is available in a range of discrete size, and its ductile behavior allows plastic deformation upon yielding, therefore avoiding brittle failures. In reinforced concrete structures, steel enhances the concrete strength by carrying the tensile forces [2]. It is also commonly used to reinforce timber constructions. In spite of its advantages, steel on its own is vulnerable in fire [3]. Elevated temperatures in the steel cause reduction in its strength and stiffness which eventually leads to failure due to excessive deformations [4]. This is crucial in steel in compared with concrete or timber members as steel conducts heat very well and often comes in thin or slender elements [5]. In structural design, there are a few functional requirements such as those stated in Clause C4 of the New Zealand Approved Document (BIA, 1992): “Buildings shall be constructed to maintain structural stability during fire to: a. Allow people adequate time to evacuate safely, b. Allow fire service personnel adequate time to undertake rescue and fire fighting operations, c. Avoid collapse and consequential damage to adjacent household units or other property.” There are a lot of different methods for protecting structural steel to maintain its strength and stability in fire, but little is known about the True behavior of the steel members under various support conditions and heating patterns [6]. The recommended fire resistance to be applied to the steel structures is usually determined based on furnace tests on single elements such as a beam or a column [7]. Contrary to popular belief, an unprotected steel element that is a part of a large complex structure may have a sufficiently high level of fire resistance to perform well in fire. This is due to the ability of the overall structure to redistribute loads from the heated area to the cooler Neighboring elements [8]. The lack of understanding of the true behavior of steel elements in fire leads to inefficient and uneconomical design [9]. To assess the overall performance of steel frames, it is important to understand the detailed behavior of a single beam with several support conditions that represent various elements in a complex structure [10]. II. MATERIAL USED AND THEIR PROPERTIES 2.1. Steel The physical properties of steel are totally different from it component element viz. iron and carbon one of the major property of steel is the ability to cool down rapidly from an extremely hot temperature after being subjected to water or oil physical properties depends on percentage composition of the constituent element and the manufacturing process a particular amount of RESEARCH ARTICLE OPEN ACCESS