Inelastic Strength Behavior of Horizontally Curved Composite I-Girder Bridge Structural Systems: Fixed-End Bridge FEA Study

2011 ◽  
Author(s):  
Se-Kwon Jung ◽  
Donald W. White
Keyword(s):  
Structural Systems ◽  
Horizontally Curved ◽  
Strength Behavior ◽  
Girder Bridge ◽  
Fixed End

Intermediate Diaphragms Arrangement in Horizontal Curved Composite Box-Girder Bridge with Corrugated Webs

2011 ◽  
Vol 94-96 ◽  
pp. 326-331
Author(s):  
Jun He ◽  
Bin Han ◽  
Yu Qing Liu ◽  
Ai Rong Chen
Keyword(s):  
Normal Stress ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Initial Curvature ◽  
Horizontally Curved ◽  
Girder Bridges ◽  
Torsion Effect ◽  
Corrugated Webs ◽  
Parametric Studies ◽  
Girder Bridge

Horizontally curved box girder bridges inherently exhibit complex torsional and distortional behavior as well as bending due to the initial curvature. As to the horizontal curved composite box-girder bridges with corrugated webs, diaphragms were arranged reasonably to reduce torsional and distortion effect for safety and stability due to the coupling of bending and torsion effect for initial curvature and reduced bending stiffness in horizontal direction for corrugated steel webs. Finite element models for a 3-spans continuous horizontal curved composite box girder bridges with corrugated webs were established. Comparing the ratio of warping normal stress to bending normal stress, the influence of the number and spacing for diaphragms on distortion control for curved bridges is investigated. Extensive parametric studies (including central angle, the aspect ratio of the box section, the spacing of the intermediate diaphragms)are performed and the design suggestions for the maximum spacing of the intermediate diaphragms are presented.

Effects of Distortion on Strength of Curved I-Shaped Bridge Girders

2003 ◽  
Vol 1845 (1) ◽  
pp. 48-56
Author(s):  
James S. Davidson ◽  
Chai H. Yoo
Keyword(s):  
Highway Bridges ◽  
Steel Bridge ◽  
Behavioral Issues ◽  
Bridge Superstructures ◽  
Horizontally Curved ◽  
Initiation And Propagation ◽  
Live Loads ◽  
Analytical Research ◽  
Girder Bridge ◽  
Torsional Stability

The curved I-shaped plate girders used in bridges with curved alignment are subjected to forces that cause significant distortion of the cross section during construction and during application of live loads after the deck has hardened. Furthermore, the addition of curvature reduces the vertical bending stiffness, increases deflection nonlinearities, and changes stability characteristics of behavior. Although the design equations of the AASHTO Guide Specifications for Horizontally Curved Highway Bridges are formulated to address these behavioral issues, design and construction engineers often are not familiar with the difficulties curvature introduces and do not understand the relationship between distortion and deflection amplification with the design equations. Analytical research conducted as part of the FHWA Curved Steel Bridge Research Project was used to highlight and describe the effects of curvature on the strength and stability of curved I-girder bridge superstructures. Issues described include the following: ( a) effects of cross-frame and diaphragm spacing on system behavior, ( b) effects of curvature on the lateral-torsional stability of curved I-shaped beams, ( c) effects of warping stresses on flange buckling, ( d) effects of curvature on web behavior, and ( e) effects of curvature on initiation and propagation of yield stresses in the girders of curved I-girder frames.

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