• C.V.Sivaramaprasad
• Dr.S.Krishna Rao

Industrial chimneys serve industries over the years to dissipate the hot flue gases in to atmosphere to reduce air pollution and to maintain air quality standards imposed on industries. Impact of pollutants on surrounding environment can be reduced by dispersing pollutants at higher altitudes. Usually, in case of chimneys draft, air quality standards, stiffness requirements etc governs the height. This paper considers different height to base diameters to study the load effects on industrial chimneys for wind and earthquake forces. Height of industrial chimneys chosen for analysis are 40m, 50m, 60m and height to base diameter ratios of 11, 13, 15, 17, 19 & 21 corresponding to each height considered. Top diameter to Base diameter ratios preferred is 0.6, 0.8 and 1. Based on these parameters, a total of 54 chimneys were analyzed for wind speeds of 39m/s, 47m/s and 55 m/s to evaluate wind response and stiffness criteria based on IS 6533:1989. All the chimneys considered were evaluated for seismic effects of zones III, IV and V based on IS 1893(Part 4):2005. Chimneys are modeled using linear element in STAAD PRO fixed at base for calculation of mode shapes and frequencies. Wind and Earthquake analysis was carried out to evaluate shear force, bending moment and stiffness criteria of industrial chimneys. Results are presented for top diameter to base diameter ratio, height to base diameter ratio, different wind speeds and earthquake zones considered. Conclusions are made based on the discussions of obtained results.

Steel chimney, dynamic analysis, seismic, wind and STAAD Pro

"Parametric Study of Industrial Steel chimneys", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.4, Issue 12, page no.428-432, December-2017, Available :http://www.jetir.org/papers/JETIR1712080.pdf

"Parametric Study of Industrial Steel chimneys", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.4, Issue 12, page no. pp428-432, December-2017, Available at : http://www.jetir.org/papers/JETIR1712080.pdf