Abstract: “Industrial steel chimneys are in the group of the tallest shell shaped structures, and these structures are one of the most important parts of power plants. The main rule of chimneys is transferring Emissions resulting from fuels to the higher level of ground. In this article the capacity curve of the structure calculated by Incremental Dynamic Analysis (IDA) and nonlinear static analysis (pushover). Therefore, ductility, over strength, Deflection amplification factor and response modification coefficient were computed by considering capacity curve. For modeling of the chimney, finite element software ABAQUS is used. The results show good agreement between response modification coefficient obtained from IDA and poshover analysis with the coefficient that suggested by AISC code. Results show that response modification coefficient suggested by AISC code is conservative. At the second part two opening were added at the bottom of the chimney, and time history analyses for ten different ear”

Keywords: steel chimney, response modification coefficient, IDA and pushover analysis, opening