4-Introduction - CHAPTER 1 INTRODUCTION 1.1 Introduction...

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CHAPTER 1 INTRODUCTION 1.1 Introduction Cold-formed steel products are just what the name con-notes: products that are made by bending a flat sheet of steel at room temperature into a shape that will support more load than the flat sheet itself. AISI specifications [ 3 ] The scope of this research is to form a design manual for designing cold formed steel using the ECP [ 2 ], and compare between the ASD and LRFD methods according to the ECP design code and AISI specifications regarding the cold formed sections. In this chapter will be a full discussion of main terms used in the design of cold formed steel and the difference between designing steel sections using the concept of allowable stress design and concept of the load and resistance factor design, helping in under standing the comparison. In Chapter two, discusses the design procedures of designing of the single channel-sections and double channel-sections back to back subjected to axial compression (compression member) with LRFD method, In addition to solved examples with both LRFD and ASD methods according to the ECP and the AISI specifications. In Chapter three, discusses the design procedures of single channel-sections sections subjected to combined shear and bending (flexural members) with LRFD methods, In addition to solved examples with both LRFD and ASD methods and according to the ECP and the AISI specifications. Chapter four summarizes the design aids of the previous two chapters, in design charts and design tables. Chapter five has a summary and conclusion for the past discussions. 1.2 Literature review 1.2.1 Past researches Cold-formed steel has become a competitive building material as it has a lot of advantages which are Lightweight, High-strength and stiffness, Fast and easy erection and installation, dimensionally stable material, No formwork needed, Durable material, Non-combustible 1
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material and Economy in transportation and handling , as a result many design communities will continue to play an important role to increase collaboration between different organizations, to improve the deign specification, and to enhance the image and awareness of cold-formed steel. Yu [ 4 ] 2
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Before discussing the different design methods, it is essential to become familiar with the terms generally used in the design of cold-formed steel structural members and to review the structural behavior of thin elements. 1.2.2 Basic cold-formed section concepts and definitions This subsection is extracted from the ECP [ 1 ], Yu [ 4 ], Yu [ 5 ] and Timoshenko, S.p. & Gere [ 6 ] and Skaloud, M. & Naprstek, J [ 7 ]. Local buckling and post buckling behavior The cold formed sections are characterized by their small thickness relative to their width. This makes the element buckle at stress values less than their yield points when subjected to compression. But, the element will not fail as it reaches its critical local buckling stress. It will continue to carry more stress due to the redistribution of stress along the element. This is why
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