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Corrugated Metal Roof Cladding Sheets Subjected To Uplift Pressure

Author(s):

Lokre Parashuram , Guru Nanak Dev Engineering College Bidar; Dr. S. RAVIRAJ, S.J.C.E., Mysore ; Sri. SATISH R, S.J.C.E., Mysore

Keywords:

Metal Roof Cladding Sheets, Corrugated Metal Roof Cladding Sheets

Abstract

Corrugated metal roof cladding sheets are widely used in the industrial, residential and other buildings. In recent times corrugated metal roof cladding sheets are used in different geometries with different colors and have a wide range of applications in industrial structures. Corrugated steel sheets are frequently used for roofing and siding in buildings because the sheets are strong, lightweight, and easy to erect. In many cases they are used as shear diaphragms to replace conventional bracing and to stabilize entire structures or individual members such as columns and beams. These roofs during windstorms are subjected to intense fluctuating external pressures at windward roof edges. Loads on these areas can be gradually increased when combined with large positive internal pressures resulting from a breached windward wall, giving a large net uplift load, that is, large negative pressure is produced. In the present work design of arc tangent corrugated metal roof cladding sheets is attempted. The sectional properties of corrugated metal roof sheets of standard sizes as specified in IS277:1992 are computed using the method suggested by Blodgett. These standard sheets are subjected to wind loads as per IS 875:1997 (part 3) considering various parameters like height and width ratio of the building, angle of roof, wind zones, etc. Design tables are proposed which give the thickness of the arc corrugated sheets to resist safely the wind pressures due to the various combinations of the above parameters. A study is also made to find the influence of parameters like height to width ratio, width of building, roof angle, and basic wind speeds on the thickness of corrugated sheets. An attempt is also made to perform a linear static analysis of corrugated metal roofing sheets using the finite element software ANSYS 12.0. ‘Quad 8 node 183’ and ‘Brick 20 node 186’ elements are used for the discretization of the corrugated metal roof sheet. Stresses and deformations are computed for various corrugated metal roofing sheets. These values are found to be within the permissible limits. The numerical analysis suggests that the values of thickness given in the design tables are found to be adequate. The proposed design tables helps the designer to readily select a suitable thickness for the corrugated sheets in any wind zone of India. These tables are simple and convenient to use, and covers wide range of parameters encountered during the design.

Other Details

Paper ID: IJSRDV5I31096
Published in: Volume : 5, Issue : 3
Publication Date: 01/06/2017
Page(s): 1432-1438

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