Journals Proceedings

Abstract

Industrial steel chimneys are one of the most important shell shaped structures which are located at the power plants and petrochemical factories. The collapses of these structures during destructive earthquakes result in delay of industrial productions. Existence of manhole at the bottom of chimneys provide inspection purposes and access to inner part of the structure. It is so clear that existence of manhole decline strength and stiffness of the structure. Therefore, presence of series of stiffeners compensate weakness in this structures. In the first part of this paper sensitivity analyses were done on the structure for calculating the most economical design of steel chimney during impressive earthquakes. At the second part pushover analyses were done on the structure for chimney with manhole, without manhole and with consideration of stiffeners. At the third part nonlinear dynamic analyses applied on the structure for achieving exact response of structure. Finally the capacity curves obtained from different analyses, and then these curves compared together