Title:
Torsion Design Example: Prestressed Concrete Girder Bridge
Author(s):
Kevin S. Benítez C. and Eva O. L. Lantsoght
Publication:
Symposium Paper
Volume:
344
Issue:
Appears on pages(s):
149-167
Keywords:
box girder bridges; prestressed concrete; shear; torsion
DOI:
10.14359/51728295
Date:
10/1/2020
Abstract:
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.
Related References:
1. California Department of Transportation. 2015. Bridge Design Practice, 7-33
2. ACI Committee 318. 2014. Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary, Farmington Hills, MI
3. American Association of Highway and Transportation Officials. 2017. AASHTO LRFD Bridge Design Specifications, 8th Edition, Washington, D.C.
4. European Committee for Standardization. 2004. Eurocode 2: Design of concrete structures - Part 1-1: General rules and rules for buildings, Brussels, Belgium
5. The International Federation for Structural Concrete. 2010. fib Model Code for Concrete Structures 2010, Lausanne, Switzerland
6. Computers & Structures, Inc. 2016. Introduction to CSiBridge
7. Vecchio, F.J., and Collins, M.P. 1986. The Modified Compression Field Theory for Reinforced Concrete Elements Subjected to Shear. ACI Journal, Proceedings. Vol. 82, Nr. 2, 219-231.
8. Benitez, K. 2019. Report of Design Computations of a Prestressed Concrete Girder Bridge. Zenodo. doi: 10.5281/zenodo.2582578