Abstract
The main objective of this project is to investigate the effects of curvature on column bending moments due to live loads in two-dimensional (2D) and three-dimensional (3D) models. Currently, the AASHTO LRFD Bridge Design Specifications allow the use of a spine model for curved concrete box girder bridges with central angle up to 34 degrees. The spine model used in the AASHTO LRFD Bridge Design Specifications calculates bridge responses such as moments and shears. Specifically, this project will analyze a two-span and three-span box girder, with one-column bent (2 cells), two-column bent (4 cells), and three-column bent (7 cells). Two different columns heights will also used within the analysis. Loads for this project were calculated using self-weight of the structure and live loads from the HS-20 (AASHTO-LRFD live load). The recorded bending moment at the top of the column allows for comparison between the longitudinal, transverse, and resultant direction. Overall, the results will serve as a guide for users to see how curvature affects the column forces due to the live loads. Most importantly, the designers will be able to determine the 2D model accuracy as curvature increases as compared to a 3D model.