<p>This paper discusses the analysis of the 600m Chicago Spire for wind climate of Chicago and other weather phenomenon. Tests performed by RWDI in the wind tunnel and results are discussed as well as lessons learned about some of the parameters of the building. Also discussed is the decision making process and factors that led to an Active Mass Damper being included on the project. A description of some of the special analyses performed for this unique project is also included.</p>
<p>The Chicago Spire has a very innovative structural system that is a true integration of architecture and engineering. The spiral shape of the tower is ideal for improved wind performance and the composite structural frame has optimized the use of a concrete core and steel framing for one of the most significant tall buildings of this century. A unique circular outrigger system, that does not require thru core struts, and the use of high strength concrete all contribute to the feasibility of this future landmark. The engineering analysis included a sequential construction analysis of the building with time dependent material properties to account for the effects of elastic shortening, creep and shrinkage of the concrete.</p>
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