Analytical Solutions for Girder Distribution Factor in Steel-Concrete Composite Girders with the Effect of Parapets
Open Access
- 25 September 2021
- journal article
- research article
- Published by Hindawi Limited in Advances in Civil Engineering
- Vol. 2021, 1-19
- https://doi.org/10.1155/2021/8471801
Abstract
The existing studies have shown that parapets have great influence on the girder distribution factor (GDF) of bridges. However, there is no method in the design guide to estimate the GDF considering the effect of parapets. This research aims to develop a simplified method for estimating the GDF by considering the effect of parapets. First, a simply supported steel-concrete composite girder bridge was tested to investigate the effect of parapets on the GDF. Then, finite-element (FE) model was established and verified by the field test data of strain and deflection. In addition, error study showed that the bending stiffness of the bridge was increased by about 92 and 19.1, respectively, due to the effects of parapet and continuous layer. As the effect of the continuous layer on each girder was relatively uniform, the simplified method was optimized only considering the effect of the parapet. Finally, the effect of the parapet on the GDF was compared and discussed. Considering the effect of the parapet, the GDF of the exterior girder calculated by the simplified method and FE analysis decreased by about 26.92 and 23.53, respectively, and the adjacent interior girder decreased by about 15.22 and 12.77, respectively. Comparing the GDF calculated by the AASHTO LRFD specifications, the GDF calculated by the simplified method decreased by about 30.77 in the exterior girder and 41.30 in the interior girder, respectively. The results indicate that the method of calculating the GDF without considering the effect of the parapet in AASHTO LRFD specifications is conservative. The GDF calculated by the simplified method was basically close to the field test results, meaning that the proposed simplified method considering the effect of the parapet was relatively accurate.Keywords
Funding Information
- Chang'an University (300102218407, 17-14K, 16-29K)
This publication has 31 references indexed in Scilit:
- Assessment of flexural lateral load distribution methodologies for stringer bridgesEngineering Structures, 2010
- Closure to “Discussion on AASHTO LRFD Load Distribution Factors for Slab-on-Girder Bridges” by C. S. CaiPractice Periodical on Structural Design and Construction, 2006
- Discussion on AASHTO LRFD Load Distribution Factors for Slab-on-Girder BridgesPractice Periodical on Structural Design and Construction, 2005
- Effect of secondary elements on bridge structural system reliability considering moment capacityStructural Safety, 2004
- Simplified Live Load Distribution Factor Equation for Steel Girder BridgesTransportation Research Record: Journal of the Transportation Research Board, 2004
- Tests and Ratings of Short‐Span Steel BridgesJournal of Structural Engineering, 1993
- Live‐Load Moments for Continuous Skew BridgesJournal of Structural Engineering, 1990
- Load distribution in edge stiffened slab and slab-on-girder bridge decksCanadian Journal of Civil Engineering, 1988
- Live Load Distribution on Braced Curved I‐GirdersJournal of Structural Engineering, 1984
- Application of a simplified method of calculating longitudinal moments to the Ontario highway bridge design codeCanadian Journal of Civil Engineering, 1979