Non Liner Dynamic Analysis of RCC Chimney

Abstract

The effect of earthquake and wind loads on the RCC chimney will plays a significant role in the dynamic analysis and design of the chimneys with extreme heights. The dynamic behaviour of the RC chimney will vary in wider range with respect to the height and longitudinal section of the chimney as the load exerted by the wind and earthquake on the chimney are dynamically sound and effective and tending the chimney to undergo peak displacement and acceleration. Because of its slenderness chimneys are the structures supposed to retain the critical loads by seismic and wind effects This project presents the study of along wind load and earthquake load effects on RC chimneys in zone I (basic wind speed 33m/sec).seismic analysis is carried out by time history analysis as per IS 1893(part 4):2005 and wind analysis by along wind effects by gust factor method as per draft code CED 38(7892):2013 (third revision of IS 4998(part 1:1992) for different heights varying from 150 to 300m and for different longitudinal sections such as uniform, tapered and uniform-tapered by using the software SAP-2000 This study presents the resulting peak displacement and acceleration for the wind analysis, and the joint displacements and base shear for the seismic analysis, period and frequency with respect to mode by time history analysis. The RC chimney with more height and uniform section will be critical compared to other types and best suitable section will be uniform tapered for both seismic and wind load effects exhibiting minimum displacement.