TSPE Dallas Monthly Meeting
Description of Presentation:
This presentation illustrates the behavior and rehabilitation of industrial steel stacks (chimneys). Stacks are an essential part of the industrial facilities. They allow the discharge of chemical waste gases from industries to the atmosphere, under stringent pollution control guidelines. The most commonly observed failure modes are discussed. A brief explanation of the European code, CICIND (Comite International des Cheminees Industrielles), and the U.S. design code, ASME STS-1 is provided. Essentially, depending on the condition of any existing structure, ASCE prescribed inspections are sometimes necessary before any rehabilitation work can be carried out. Analytical and numerical simulations were performed using MecaStack software (local model), RISA-3D software, and SAP2000 software (global models). The design is based on the ASME STS-1-2011 standard code. Fatigue can be a significant issue in steel stack design and needs to be considered in the design. Discontinuity around the manhole at the bottom, and some other details were investigated with the finite element software. Results in terms of deformation and principle stresses, including von Mises stresses, allowed recommendations, repair and construction documents to be prepared.
Dr. Okelo, a graduate of UT Arlington, 2002, is currently a Senior Structural Engineer with BR Architects and Engineers, Inc. (BRAE), where he is involved with the design and review of residential, commercial and industrial projects. This includes the review of school projects built to meet the ICC 500 code requirements for Storm Shelters. In conjunction with forensic engineering for structural failures, he is also involved with development of economic designs for repair and rehabilitation of such structures. Previously, while working for CPY and APM, he performed consulting work for Dallas Area Rapid Transit, (DART), and for Texas Department of Transportation (TxDOT). Furthermore, Dr. Okelo was on the faculty at: The University of Stuttgart, Germany; UT Arlington, and Lamar University in TX. He is the author of several, peer-reviewed technical publications in structural engineering, as well as a reviewer for some technical journals.
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