Prestressing and Precasting

May 5th, 2015
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The prestressing and precasting of concrete are inter-related features of the modern building industry. Through the application of imaginative design and quality control, they have, since the 1930’s, had an increasing impact on architectural and construction procedures.

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prestressCONTENTS1.Introduction2.Definitions3.Advantages4.Limitations5.Fundamentals of Prestressing6.Prestressing Methods7.Fire Resistance of Prestressed Concrete8.Construction Applications of Prestressing9.Conclusions1. IntroductionThe prestressing and precasting of concrete are inter-related features of the modern building industry. Through the application of imaginative design and quality control, they have, since the 1930s, had an increasing impact on architectural and construction procedures. Prestressing of concrete is the application of a compressive force to concrete members and may be achieved by either pretensioning high tensile steel strands before the concrete has set, or by post-tensioning the strands after the concrete has set. Although these techniques are commonplace, misunderstanding of the principles, and the way they are applied, still exists. This paper is aimed at providing a clear outline of the basic factors differentiating each technique and has been prepared to encourage understanding amongst those seeking to broaden their knowledge of structural systems. 2.Definitions2.1 Prestressed ConcretePrestressing of concrete is defined as the application of compressive stresses to concrete members. Those zones of the member ultimately required to carry tensile stresses under working load conditions are given an initial compressive stress before the application of working loads so that the tensile st

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