International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
ANALYTICAL STUDY ON CONCRETE FILLED ELLIPTICAL STEEL TUBULAR COLUMN APARNA V C1, SARAVANA KUMAR N2, BALAJI C D R3 1PG
student, Dept of Civil Engineering, Mepco Schlenk Engineering College, Sivakasi, Tamil Nadu, India 2Assistant professor, Dept of Civil Engineering, Mepco Schlenk Engineering College, Sivakasi, Tamil Nadu, India 3 Managing Head, Inner Engineering Management and Consultancy, Sivakasi, Tamil Nadu, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Concrete filled steel tubular columns have gained
immense importance in recent decades due to numerous benefits especially in developed countries like china, Japan, U.S.A, Britain. Experimental programs are expensive, time consuming and limited to small ranges of parameters, therefore it is important to develop an analytical model for Concrete filled elliptical steel tubular members. This research provides an analysis of the interaction between concrete core and steel tube in CFEST columns. For this analysis, ABAQUS software was selected. Using this software Analysis was done by varying the thickness of steel tube, length of the column, grade of concrete and diameter ratios (a/b) and then observe the performance of the CFEST column. Currently there is no design guidance available in any Code of Practice for this elliptical cross section. The main aim of the research presented in this paper is to develop a numerical method to be able to predict the axial compressive behaviour of short concretefilled elliptical steel tubular columns. The ultimate load carrying capacity and failure modes were obtained from the numerical models and then compared against the experimental results; good agreements were obtained .Finally local buckling of steel tube associated with the concrete infill could be observed. Key Words: abaqus, elliptical cfst column, finite element method, diameter –to –thickness ratio, buckling
1. INTRODUCTION Concrete filled steel tubes [CFST] are composite members consists of steel tubes filled with concrete. The inner concrete core adds stiffness and compressive strength and it reduces local buckling. The outer steel tube acts as both longitudinal and lateral reinforcement and also it resists tension and bending moment. This type of composite column does not need any formwork. Therefore it reduces cost of construction, labour cost and construction time. Concrete filled steel tubular column research began in 1990s. Most of the researchers work with square, rectangular, circular cross section. Now, one of the new cross © 2017, IRJET
|
Impact Factor value: 5.181
|
section elliptical [fig4] attracted most of the architects and structural engineers due to their aesthetic appearance and excellent structural behaviour. Only few papers are available on the research of concrete filled elliptical steel tubular column can be found. Researches on Experimental study of elliptical concrete filled steel columns under axial compression by Jamaluddin [1] showed that the strength and stiffness of CFEST increase as the concrete strength increases. Tests on CFEST beams and columns [3] by Quing Xin Ren showed that the compressive strength of CFEST Columns under axial compression is 2.47 times that of the hollow steel tubular columns. Using Abaqus/Standard software develop a model and then analyze the parameters like a)thickness of steel tube b)grade of concrete c)diameter ratios (a/b) d)length of the column.
2. FINITE ELEMENT ANALYSIS Finite element analysis is a numerical method. In this paper, finite element software Abaqus/ standard was used to capture the structural behaviour of elliptical CFST column. ABAQUS is a highly sophisticated, Finite Element program designed primarily to model the behaviour of solids and structures under externally applied load. ABAQUS is used by a wide range of industries, including aircraft manufacturers, automobile companies, oil companies and micro electronics industries as well as national laboratories and research universities.
2.1 MODELING AND MATERIAL PROPERTIES Abaqus provides a wide range of elements for different geometries and analysis types. In this paper, Concrete was modeled as a C3D8R [Continuum 3D 8noded reduced integration element] and Steel tube was modeled as a S4R [shell 4 node reduced integration element].
ISO 9001:2008 Certified Journal
|
Page 1539