PARAMETRIC STUDY OF RCC CHIMNEY FOR DIFFERENT LOADING CONDITION

Abstract

A chimney is a means by which waste gases produced due to industrial processes are discharged to the atmosphere. Height of the chimney is kept such that the gases get diluted due to atmospheric turbulence. Chimney is particularly susceptible to the wind pressures so it is important to correctly estimate the design wind loads. It is a vertical cantilevered shell pierced by openings where necessary and subjected to large temperature gradients. The prime focus of the present major project work is to study the behaviour of chimney structure under the effect of wind loads, earthquake loads and temperature gradients. Chimney has been modelled in STAAD.Pro V8i using the lumped mass modelling approach to calculate dynamic properties useful for seismic and wind analysis. BIS has published draft code IS 4998 in April 2013 for design of reinforced concrete chimney. The provisions of the Draft code IS 4998:2013 are studied and compared with the provisions of the Indian Standards IS 4998 (Part 1) 1992. The effect of temperature gradient and stresses induced on chimney is carried out. Parametric study has also been carried out for an RCC chimney for different geometric variation in chimney. IndexTerms RCC Chimney, Seismic effect, Along and across wind effect, Stresses, Draft code, Stack effect, STAAD.Pro ________________________________________________________________________________________________________