Title:
Torsion in Prestressed Curved Bridges
Author(s):
A. Ghali
Publication:
Symposium Paper
Volume:
93
Issue:
Appears on pages(s):
815-834
Keywords:
bridges (structures); computer programs; curved beams;
post-tensioning; prestressed concrete; statically indeterminate
structures; structural analysis; torsion
DOI:
10.14359/6329
Date:
9/1/1986
Abstract:
Prestressing by post-tensioned tendons with parabolic profiles can be arranged in a curved bridge such that the bend-ing moments are negligibly small due to the combined effect of dead load and prestressing. However, this can result in high torsional moments for which the bridge has to be designed. The reasons and the analysis for the high torsional moments are discussed. A curved continuous bridge with two spans and three possible support conditions is analyzed numerically to get an indication about the magnitude of the torsional moments. Reference is made to an available computer program which can be conveniently used in the analysis of any framed structure. The computer program can handle curved members with varying cross section and externally applied loads as well as prestressing loads.