International Research Journal of Engineering and Technology (IRJET) Volume: 09 Issue: 06 | Jun 2022
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e-ISSN: 2395-0056 p-ISSN: 2395-0072
Structural Performance of Cold Formed Steel Quadruple Built-up Box Column Mekha S Babu1, Devu Asokan2 1Mekha 2Devu
S Babu, M.Tech Student, Dept. of Civil Engineering, Sree Buddha College of Engineering, Kerala, India Asokan, Assistant Professor, Dept. of Civil Engineering Sree Buddha College of Engineering, Kerala, India
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Abstract - To better understand the mechanical behaviour
rolled steel results in a productwith a better more finished surface with closer tolerance, also yield smoother surfaces which are oily to touch. It can be used harder and stronger than hot rolled steel and aesthetically pleasing finish with wider range of surfaces.
of cold-formed steel (CFS) quadruple built-up box-section columns associated with flexural buckling, axial compression tests and screw spacing are conducted. When the screw spacing was reduced from 600 to 150 mm, the load-bearing capacity increased by about 14.6%–17.5%. A finite-element model was developed and calibrated against the test results. A series of parametric analyses was carried out to analysis the effects of the screw spacing and shear stiffness on the elastic buckling load and ultimate load-carrying strength. The structural performances of the cold formed steel built-up columns under axial compression test was studied through the ANSYS software. Key Words: Cold-formed steel (CFS), Built-up section, Flexural buckling, Column 1. INTRODUCTION
Fig.1.1 Cold-formed steel section In this thesis, a structural performances of cold formed steel quadruple column is studied. Also, built-up column with different shape of section is also analysed. The modelling and analysis is done using finite element software ANSYS 21.
Cold-Formed Steel (CFS) members are made from structural quality steel sheet that are formed into Csections and other shapes by roll forming the steel through series of rollers which doesn’t required heat to form the shapes unlike hot-rolled steel, thus the cold formed steel. CFS members Fig.1.1 used in bridges, railway coaches, highway products, transmission towers etc and these types of cold- formed from steel sheet, strip, plate etc in roll forming machines by bending operations, pressing, stamping, which is in the form of thin gauge sheets commonly used in construction industry for structural or non- structural items such as column, beam, studs, built-up sections and other components. The difference between hot and cold formed steel is how they are processed. Hot rolled steel has been rolled at high temperature while cold rolled steel is essentially hot rolled steel is further processed in cold reduction materials. Cold rolling produces steel with closer dimensional tolerances and a wider range of surfaces finishes than hot rolling and upto 20% stronger than hot rolled through the use of strength hardening. When making more precise shapes, the process involves : (a) breakdown (b) semi-finishing (c) sizing (d) semi-roughing (e) roughing (d) furnishing. Cold
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1.1 Cold formed steel quadruple column A cold formed steel with channel section C shape and sigma shape is analyzed shown in Fig.1.2.and 1.3. The sections like C shape (C-face to Face and C-Back to Back), Sigma shape (Sigma–Face to Face and Sigma- Back to Back) are used here. Material is used Q355 steel sheet .Quadruple is defined as a structure consisting of four parts or elements, four sections of CFS can be over-lap the column by using screws. The use of CFS built-up column to resist axial forces in CFS multistory buildings has gained high strength and lightweight structure.
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