Comparative study of an RC chimney as per different codes

Bashir, Ishfaq
Almost all the industrial reinforced Industrial concrete chimneys are tall and slender structures having circular cross-sections. Analysis and design of such structures require dynamic analysis for seismic loads, the pressure resulting from wind and for loads due to self- weight of the structure. Under a given lateral dynamic load, the exact geometry of a RC chimneys plays an important role in the structural behavior. Stiffness parameters of RC chimneys significantly depend on the geometric properties of the structure. Therefore, modeling of such structure should be carried out meticulously. However, basic dimensions of industrial RC chimney, such as height above ground, the diameter at top, etc., are generally derived from the respective national environmental provisions for where the structure is to be built. The objective of the present study is to compare various standards for design of reinforced concrete chimney. Standards considered in this study are Turkish code, Eurocode and ASCE. A chimney constructed in late 70’s in Eregli a district of Zonguldak in the black sea region of Turkey, has been considered for this study. The chimney is modeled with the same design details, as the original RC chimney. The main focus is to compare the wind and the seismic analyses results in accordance with Eurocode, Turkish and ASCE standards. Bending moments and stresses are calculated under seismic forces and pressure due to wind using load combinations as per the procedure given in Eurocode, Turkish and ASCE standards. The seismic analysis is performed using response spectrum method. Finally, the maximum demand values obtained in the wind analysis and seismic analysis are compared to decide on design values.


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Citation Formats
I. Bashir, “Comparative study of an RC chimney as per different codes,” M.S. - Master of Science, Middle East Technical University, 2019.