Stress Analysis of Precast Prestressed Concrete Beams during Lifting
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2014, Vol 4, Issue 9
Abstract
The use of long span prestressed beams in bridge construction is very common. Even if the sections are economical the erection of the beam still poses a challenge in construction. Not much work has been done in the analysis of stress and deflection at erection stage. This paper deals with the behavior of precast prestressed beams during lifting. Since the spans of these beams are large, it may fail due to cracking during erection. In this paper a detailed 3-dimensional Finite Element Analysis of 2 prestressed beam sections was done with incorporating the effect of initial imperfections and prestress. Results were obtained for both prestressed beam and non-prestressed beam and were compared with Moen’s formulae. To include the effect of prestressing cables in the beam new additional formulae were introduced and used in combination with the Moen’s. The results obtained were approximately validated with the Finite Element Analysis results. It is seen that the prestressing cables have a significant effect on the behavior of a beam during lifting. For a prestressed beam the overhang length should be kept minimum for safe erection which is opposite in the case of a normal beam.
Authors and Affiliations
V. M. Gaykar , J. G. Solanki
Keywords
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