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Experimental Study on Development Length of Prestressing Strand in Pretensioned Prestressed Concrete Members  

Kim, Eui-Sung (Civil Development Team, Hyundai Development Company)
Publication Information
Journal of the Korean Society of Safety / v.23, no.6, 2008 , pp. 115-121 More about this Journal
Abstract
By bond mechanism between the prestressing strand and the concrete surrounding it, the effective force of prestressing must be transferred to the concrete entirely. The distance required to transfer the effective force of prestressing is called the transfer length, and the development length is the bond length required to anchor the strand as it resists external loads on the member. Transfer length was determined from the concrete strain profile at the level of the strands at transfer and development length was determined from various external loading lengths and compared with current code equation. Through the test results, bond failure is predicted based on the distress caused by cracks when they propagate within the transfer zone of prestressing strand. The current code equation was found to be conservative in comparison with the measured value.
Keywords
bond; prestressing strand; transfer length; development length; bond failure; flexural failure;
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