Potential Improvement in Rating Factors of Concrete T-Beam Bridges through Refined Analysis: Evaluation of Distribution Factors
Publication: Journal of Bridge Engineering
Volume 27, Issue 9
Abstract
This study explores the use of refined analysis methods to potentially increase load ratings of concrete T-beam bridges by obtaining a decrease in live-load distribution factors. The studied T-beam bridges are vulnerable to posting under consideration of the new federal regulations and when using conventional, simplified equations for load distribution factors. Finite-element models for a total of 25 in-service bridges were developed and analyzed under different vehicle loadings, including special hauling vehicles (SHVs). The effect of transverse positioning of the vehicle load on the computation of the distribution factors was also considered. The moment and shear effects in each girder were extracted and the distribution factors for the interior and exterior girders of the selected bridges were computed. These distribution factors were compared with those obtained from the AASHTO code-specified equations. The results were used to develop regression models to predict the percent change in distribution factors if a refined analysis is implemented. Furthermore, a support vector machine (SVM) is used to identify the governing truck type based on geometrical properties of bridges. Results indicate that moment distribution factors obtained from refined analysis will likely improve rating factors for SHVs, while the shear distribution factors will likely be larger.
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Data Availability Statement
Some data that support the findings of this study are available from the corresponding author upon reasonable request, such as detailed information of the calculated distribution factors, the distribution factors computed under each vehicle loading and each loading position, and detailed information on the SVM analysis.
Acknowledgments
This work was part of a project sponsored by the VDOT. The contents of this paper reflect the views of the authors, who are responsible for the facts and accuracy of the presented data, but the contents do not necessarily reflect the official views of the VDOT.
References
AASHTO. 2002. Standard specifications for highway bridges. 17th ed. Washington, DC: AASHTO.
AASHTO. 2010. AASHTO LRFD bridge design specifications. 5th ed. Washington, DC: AASHTO.
AASHTO. 2015. Manual for bridge evaluation. 2nd ed. with 2016 Interim Revisions. Washington, DC: AASHTO.
Adams, A., N. Galindez, T. Hopper, T. Murphy, P. Ritchie, V. Storlie, and J. Weisman. 2019. Manual for refined analysis in bridge design and evaluation. FHWA-HIF-18-046. Washington, DC: United States. Federal Highway Administration. Office of Infrastructure.
Angulo, C., X. Parra, and A. Catala. 2003. “K-SVCR. A support vector machine for multi-class classification.” Neurocomputing 55 (1–2): 57–77. https://doi.org/10.1016/S0925-2312(03)00435-1.
Barr, P. J., M. O. Eberhard, and J. F. Stanton. 2001. “Live-load distribution factors in prestressed concrete girder bridges.” J. Bridge Eng. 6 (5): 298–306. https://doi.org/10.1061/(ASCE)1084-0702(2001)6:5(298).
Barr, P. J., N. Yanadori, M. W. Halling, and K. C. Womack. 2007. “Live-load analysis of a curved I-girder bridge.” J. Bridge Eng. 12 (4): 477–484. https://doi.org/10.1061/(ASCE)1084-0702(2007)12:4(477).
Cai, C. S. 2005. “Discussion on AASHTO LRFD load distribution factors for slab-on-girder bridges.” Pract. Period. Struct. Des. Constr. 10 (3): 171–176. https://doi.org/10.1061/(ASCE)1084-0680(2005)10:3(171).
Conner, S., and X. S. Huo. 2006. “Influence of parapets and aspect ratio on live-load distribution.” J. Bridge Eng. 11 (2): 188–196. https://doi.org/10.1061/(ASCE)1084-0702(2006)11:2(188).
DePolo, D. S., and D. G. Linzell. 2008. “Evaluation of live-load lateral flange bending distribution for a horizontally curved I-girder bridge.” J. Bridge Eng. 13 (5): 501–510. https://doi.org/10.1061/(ASCE)1084-0702(2008)13:5(501).
Dicleli, M., and S. Erhan. 2009. “Live load distribution formulas for single-span prestressed concrete integral abutment bridge girders.” J. Bridge Eng. 14 (6): 472–486. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000007.
Ebeido, T., and J. B. Kennedy. 1996. “Girder moments in continuous skew composite bridges.” J. Bridge Eng. 1 (1): 37–45. https://doi.org/10.1061/(ASCE)1084-0702(1996)1:1(37).
Eom, J., and A. S. Nowak. 2001. “Live load distribution for steel girder bridges.” J. Bridge Eng. 6 (6): 489–497. https://doi.org/10.1061/(ASCE)1084-0702(2001)6:6(489).
Fanous, F., J. May, and T. Wipf. 2011. “Development of live-load distribution factors for glued-laminated timber girder bridges.” J. Bridge Eng. 16 (2): 179–187. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000127.
FHWA (Federal Highway Administration). 2013. Action: Load rating of specialized hauling vehicles. McLean, VA: FHWA.
Gheitasi, A., and D. K. Harris. 2015. “Implications of overload distribution behavior on load rating practices in steel stringer bridges.” Transp. Res. Rec. 2522 (1): 47–56. https://doi.org/10.3141/2522-05.
Harris, D. K. 2010. “Assessment of flexural lateral load distribution methodologies for stringer bridges.” Eng. Struct. 32 (11): 3443–3451. https://doi.org/10.1016/j.engstruct.2010.06.008.
Harris, D. K., O. E. Ozbulut, A. Bagheri, M. S. Dizaji, A. K. Ndong, and M. Alipour. 2020. Load rating strategies for bridges with limited or missing As-built information. FHWA/VTRC 20-R27. Charlottesville, VA: Virginia Transportation Research Council.
Herzberg, P. A. 1969. The parameters of cross-validation. Psychometric Monograph No. 16. Richmond, VA: Psychometric Society.
Huang, D. 2004. “Field test and rating of Arlington curved-steel box-girder bridge: Jacksonville, Florida.” Transp. Res. Rec. 1892 (1): 178–186. https://doi.org/10.3141/1892-19.
Huang, D. 2008. “Full-scale test and analysis of a curved steel-box girder bridge.” J. Bridge Eng. 13 (5): 492–500. https://doi.org/10.1061/(ASCE)1084-0702(2008)13:5(492).
Kennedy, J. B., and N. F. Grace. 1983. “Load distribution in continuous composite bridges.” Can. J. Civ. Eng. 10 (3): 384–395. https://doi.org/10.1139/l83-066.
Kim, S., and A. S. Nowak. 1997. “Load distribution and impact factors for I-girder bridges.” J. Bridge Eng. 2 (3): 97–104. https://doi.org/10.1061/(ASCE)1084-0702(1997)2:3(97).
Lawson, W. D., H. Seo, J. G. Surles, and S. M. Morse. 2018. “Impact of specialized hauling vehicles on load rating older, bridge-class, reinforced concrete box culverts.” Transp. Res. Rec. 2672 (41): 87–100. https://doi.org/10.1177/0361198118781148.
Mertz, D. R. 2015. Vol. 18 of Steel bridge design handbook: Load rating of steel bridges. FHWA-HIF-16-002. Washington, DC: Federal Highway Administration. Office of Bridges and Structures.
Morcous, G., K. Hanna, and M. K. Tadros. 2010. Load rating of complex bridges. SPR-1 (10) P329. Lincoln, NE: Nebraska Transportation Center.
NCHRP (National Cooperative Highway Research Program). 2007. Legal truck loads and AASHTO legal loads for posting. NCHRP Project 12-63 (Rep. 575). Washington, DC: Transportation Research Board.
Nowak, A. S., J. Eom, A. Sanli, and R. Till. 1999. “Verification of girder-distribution factors for short-span steel girder bridges by field testing.” Transp. Res. Rec. 1688 (1): 62–67. https://doi.org/10.3141/1688-08.
Puckett, J. A., S. X. Huo, M. Jablin, and D. R. Mertz. 2011. “Framework for simplified live load distribution-factor computations.” J. Bridge Eng. 16 (6): 777–791. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000285.
R Core Team. 2013. R: A language and environment for statistical computing. Vienna, Austria: R Foundation for Statistical Computing.
R Development Core Team. 2005. R: A language and environment interaction for statistical computing. Vienna, Austria: R Foundation for Statistical Computing.
Wang, N., B. R. Ellingwood, and A. H. Zureick. 2011a. “Bridge rating using system reliability assessment. II: Improvements to bridge rating practices.” J. Bridge Eng. 16 (6): 863–871. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000171.
Wang, N., C. O’Malley, B. R. Ellingwood, and A. H. Zureick. 2011b. “Bridge rating using system reliability assessment. I: Assessment and verification by load testing.” J. Bridge Eng. 16 (6): 854–862. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000172.
Yoo, C. H., K. Kim, K. C. Lee, and J. Kang. 2013. “Bending strength of a horizontally curved composite I-girder bridge.” J. Bridge Eng. 18 (5): 388–399. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000377.
Yost, J. R., J. L. Schulz, and B. C. Commander. 2005. “Using NDT data for finite-element model calibration and load rating of bridges.” In Structures Congress 2005: Metropolis and Beyond, 1–9. Reston, VA: ASCE.
Zokaie, T. 2000. “AASHTO-LRFD live load distribution specifications.” J. Bridge Eng. 5 (2): 131–138. https://doi.org/10.1061/(ASCE)1084-0702(2000)5:2(131).
Zokaie, T., R. A. Imbsen, and T. A. Osterkamp. 1991. “Distribution of wheel loads on highway bridges.” Transp. Res. Rec. 1290: 119–126.
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Received: Oct 10, 2021
Accepted: May 15, 2022
Published online: Jul 15, 2022
Published in print: Sep 1, 2022
Discussion open until: Dec 15, 2022
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