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The Effects Of A Variable Modulus Of Elasticity On Prestress Losses In Bridge Girders

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The Effects Of A Variable Modulus Of Elasticity On Prestress Losses In Bridge Girders

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Title: The Effects Of A Variable Modulus Of Elasticity On Prestress Losses In Bridge Girders
Author: Singh, Brahama Prakashni
Abstract: The purpose of this research is to evaluate a method proposed by Franz Dischinger (Dischinger, 1939) to consider the effects of a variable modulus of elasticity (MOE) of concrete over a period of time. Current guidelines suggested by the American Association of State Highways and Transportation Officials (AASHTO) assume a constant value for the MOE and base its calculation on the unit weight of concrete and the twenty eight day compressive strength of concrete. A few methods such as the ACI 209 Model Code (ACI 209, 1982) and CEB-FIP 1990 (CEB-FIP 1990, 1990) provide guidelines for the calculation of a variable modulus of elasticity. Dischinger's method varies the MOE through the use of a concrete creep function. The values of the time dependent MOE for each of the methods have been compared. Specifically this research focused on the effect Dischinger's method has on prestress losses in a prestressed concrete beam. This research also compared the losses between all three methods. The results showed that Dischinger's theory provides for higher values of modulus of elasticity and predicts higher losses. Over a period of time the prestress losses become constant. This is extremely useful since it can be used in conservative beam design.
URI: http://hdl.handle.net/10106/6215
Date: 2011-10-11

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appendixcsup.pdf 68.62Kb PDF View/Open
appendixDsup.pdf 60.81Kb PDF View/Open
appendixEsup.pdf 60.78Kb PDF View/Open
Singh_uta_2502M_11242.pdf 506.7Kb PDF View/Open

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