Determination of cyclonic factor in different wind zones of India

Abstract

Cyclone has the highest turbulence intensity compared to other storms in India. Therefore, structures are subjected to greater risk under cyclonic storms. To account for the enhanced risk, an enhancement factor also called cyclonic factor (k4), whose value as mentioned in IS-15498:2004 is equal to 1 for dwellings, 1.15 for industrial buildings, and 1.30 for structures of post-cyclone importance shall be considered while determining the design wind speed. Hence, the values of cyclonic factors depend on the types of structures, wherein, extreme wind climate modeling is not taken into consideration for the specification of these factors. In this paper, cyclonic factors for six zones of India have been specified based on the modeling of extreme wind speed data for tropical cyclones. © 9th Asia Pacific Conference on Wind Engineering, APCWE 2017. All Rights Reserved.