Bachelor of Engineering (Hons) Civil UNIVERSITI TEKNOLOGI MARA 2010
A FINITE ELEMENT ANALYSIS MODEL FOR THE BEHAVIOUR OF COLD-FORMED STEEL CHANNEL COLUMNS UNDER AXIAL THRUST
This report is submitted as a requirement for the degree of Bachelor of Engineering (Hons) Civil
UNIVERSITI TEKNOLOGI MARA MARCH 2010
DECLARATION BY THE CANDIDATE
I (Mastura Binti Rafek, 2007121693) confirm that the work in this report is my own work and the appropriate credit has been given where references have been made to the work of other researchers. (………………………………………….) Student Name : Mastura Binti Rafek Student ID : 2007121693 Date : 31st MARCH 2010
First and foremost, I would like to express my gratitude to ALLAH S.W.T for giving me the guidance and strength in making this research project proposal a success. I would like to express my sincerest gratitude to all those who helped me navigate this long and fruitful journey.
Sincerest thanks go to my supervisor Mr. Mohd. Raizamzamani Bin Md. Zain for his guidance, knowledge, patience, supervision and encouragement towards me in preparation of this study. His are ever dynamic and also his dedication in encourage of young researcher. Not forget, great appreciation go to my friends for their co- operation in completion this project.
Finally, to my family, their love and care have brought me to this level. Their substantial encouragement and generous support have helped me to succeed. I also would like to say thank to everybody for those who help me even either directly or indirectly, because without their help, I think it is impossible for me to complete this proposal. May ALLAH S.W.T bless us all.
ABSTRACT This study focused on the behaviour of cold-formed steel channel columns under axial thrust. Two channel sections with different stiffener sizes and one channel section with intermediate stiffener at the web were modelled using finite element analysis with each channel have three specimens. All nine specimens have a constant value of thickness, 1.0mm, a nominal width of the web of 75 mm and nominal width of the flange of 45mm and the length range from 500mm to 1000mm and lip size, 10mm. Meanwhile, the size of intermediate stiffener for web stiffener and flange stiffener are 45mm and 25mm respectively. A numerical analysis is undertaken to determine the ultimate loading capacity and mode of deformation of cold-formed steel channel columns. The finite element method was used to investigate the structural behaviour of the steel channel columns. From the analysis, it has found that the ultimate loading capacity for specimen designated as S-500 gave the highest value compared to others of specimen. The result presented shown that loading capacities increased proportionally with shape of the channel and intermediate stiffener provide strongest value of loading capacity. Besides that, the result also shows that the increment in length give lesser value of ultimate load. A comparison of results calculated using various international standards using these models shows good agreement with finite element analysis results. Keywords: Cold-formed Steel Section, local buckling, lipped channel, intermediate stiffeners.
TABLE OF CONTENT
ACKNOWLEDGEMENT ABSTRACT TABLE OF CONTENT LIST OF FIGURES LIST OF TABLES LIST OF ABBREVIATIONS
i ii iii vii xi xii
CHAPTER 1.0: INTRODUCTION 1.1 Background of the study 1.2 Problem Statement 1.3 Objective 1.4 Scope of the Study 1.5 Significance of the Study 1 3 4 4 6
CHAPTER 2.0: LITERATURE REVIEW 2.1 Introduction 2.2 Types of Cold-Formed Channel Column 2.2.1 Plain channel 2.2.2 Lipped channel 2.2.3 Intermediate stiffener channel 2.3 General Materials iii 7 8 9 10 11 12
2.3.1 Zinc coated 2.4 Advantages of Cold-Formed Open Section 2.4.1 No insect and fungal infection 2.4.2...