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Title: Torsion Design Example: Prestressed Concrete Girder Bridge

Author(s): Kevin S. Benítez C. and Eva O. L. Lantsoght

Publication: Symposium Paper

Volume: 344


Appears on pages(s): 149-167

Keywords: box girder bridges; prestressed concrete; shear; torsion

DOI: 10.14359/51728295

Date: 10/1/2020

The design of a cast-in-place, post-tensioned concrete, multi-cell box girder bridge under combined torsion, shear, and flexure is presented in this example. The bridge covers three spans of different lengths, supported by two abutments and two bents; its cross-section consists of three 12 ft (3.7 m) lanes, two 10 ft (3.0 m) shoulders, and two concrete barriers. The detailed procedure for the design based on ACI 318-14 is presented, and a comparison is done with the design results for: AASHTO LRFD 2017, EN 1992-1-1:2004, and MC-2010. With this example, the authors illustrate the differences between provisions of the aforementioned codes for design of torsional effects, outlining the different theories and approaches used for each of these.