Finite Element Analysis of Deep Wide-Flanged Pre-stressed Girders to Understand and C

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Finite Element Analysis of Deep Wide-Flanged Pre-stressed Girders to Understand and Control End Cracking

Author: Oliva, Michael G | Size: 9.48 MB | Format: PDF | Quality: Original preprint | Publisher: University of Wisconsin, Madison | Year: 2011 | pages: 132

Hundreds of prestressed concrete girders are used each year for building bridges in Wisconsin. The prestress transfer from the prestressing strands to concrete takes place at the girder ends. Characteristic cracks form in this end region during or immediately after detensioning. Potential solutions to control end cracking were examined via finite element models and the impact of each solution on cracking was evaluated. Modifications to reinforcement bar size, debonding ratios, strand cutting sequence and use of draped strand patterns were simulated by the models. The results from different analyses were compared to quantify the success of each method in reducing strains causing girder end cracks. The tension strains leading to cracks of all types were responsive to debonding some of the bottom flange prestressing strands. Bottom flange cracking can be prevented by methodically debonding exterior strands, keeping the draped strands bonded, and evenly distributing the remaining bonded strands over the bottom flange.

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