Title: Lifting Precast Bridge Beams – Engineering is the Issue

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Publication: CIA

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Date: 2/28/2011

Abstract:
This paper reviews the use of loops of prestressing strand cast into precast elements – particularly bridge beams – for the purpose of creating lifting connection points. Current & previous standards and industry guidance are referred to as well as some analysis of industry experience with strand loop lifting and the engineering issues involved. It concludes that there is little to justify current practice and much to discourage it. This conclusion is extended by considering risk management concepts which include the benefits of linking design responsibility and product liability. The value of correctly applied engineering design and the risks without it are discussed as is the imperative for precast design to account robustly for the construction phase. Finally, suggestions are offered to improve the engineering & performance merits of currently inadequate strand lifting loop details.