Abstract
Steel chimneys are used for releasing smoke in various power plants, oil and gas industries. Steel chimneys are generally subjected to static and dynamic loads. Geometry of steel chimney like height, diameter at top and bottom plays key role when structure subjected to lateral loading like wind or earthquake. In this study static analysis is conducted on a self-supporting steel chimney of height 90 m subjected to wind load located in Vijayawada for categories 1, 2, 3 and 4. For comparison of IS: 875 (part-3)-1987 to IS: 875 (part-3)-2015, variation of Terrain, height and structure size factor (K2), Design wind speed (VZ), Design wind pressure (PZ), segment moment with respect to chimney base and corresponding segment base of all categories are considered in this study, as basic dimensions of chimney, basic wind speed (Vb), probability factor (K1) and topography factor (K3) are same for both codes. From the study it is found that K2,VZ,PZ, segment moment with respect to chimney base and segment base of all categories are more for IS: 875 (part-3)-2015 than IS: 875 (part-3)-1987. VZ, PZ, segment moment with respect to corresponding segment base of all categories for IS: 875 (part-3)-2015 increases because of Importance factor for cyclonic region (K4).
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