Field Study of Bonded Link Slabs Subjected to Ambient Live and Thermal Loads
Publication: Journal of Bridge Engineering
Volume 29, Issue 6
Abstract
Multispan bridges with simply supported girders are straightforward to construct and economical but have historically utilized expansion joints between spans. The negative long-term impacts of expansion joints are well-documented in the literature; eventual leaking causes damage to the girder ends and substructures. To avoid this deterioration associated with the use of expansion joints, link slabs may be used instead. However, the complex induced forces and deformations associated with link slabs are not fully understood and may damage the slab, reducing the life of the superstructure. This paper presents the results of a field study examining bonded link slab behavior under ambient (in-service) live and thermal loads on five Texas bridges. Typical Texas link slabs are not debonded at the girder ends, feature continuous longitudinal reinforcement, and incorporate partial-depth precast concrete panels. The five bridges were instrumented with displacement gauges at the girder ends, at both link slab and expansion joint locations, and strain gauges attached to the bottom of the bridge deck. Displacement, strain, and temperature data collected for a period of 1–2 weeks were used to estimate link slab mechanics. The results show differences in behavior between the differing link slab details, lateral deck stiffness characteristics, and continuous deck unit lengths. The increase in superstructure stiffness provided by the link slab is quantified. Longitudinal deck cracking and reinforcing steel yield behavior are predicted at each monitored link slab. The calculated displacement and strain data show that both live and thermal load effects should be considered in the design.
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Data Availability Statement
The data that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research was funded by the Texas Department of Transportation (TxDOT) as part of Project 0-7013, Performance and Improvement of Texas Poor Boy Continuous Bridge Deck Details. The authors thank the TxDOT personnel for their support. Additionally, the authors thank the graduate students Daron Smith, Pushkar Shivechchhu, and Seung Hyun Yoon for their assistance with field instrumentation.
References
Aktan, H., U. Attanayake, and E. Ulku. 2008. Combining link slab, deck sliding over backwall, and revising bearings. Kalamazoo, MI: Western Michigan University.
Au, A., C. Lam, J. Au, and B. Tharmabala. 2013. “Eliminating deck joints using debonded link slabs: Research and field tests in Ontario.” J. Bridge Eng. 18 (8): 768–778. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000417.
Azizinamini, A., E. H. Power, G. F. Myers, and H. C. Ozyildirim. 2014. Bridges for service life beyond 100 years: Innovative systems, subsystems, and components. Washington, DC: Transportation Research Board.
Bayrak, O., S.-H. Chao, J. O. Jirsa, R. E. Klingner, U. Azimov, J. Foreman, S. Foster, N. Karki, K. Y. Kwon, and A. Woods. 2013. Bridge deck reinforcement and PCP cracking: Final report. Technical Rep. Austin, TX: TxDOT, United States Federal Highway Administration, Univ. of Texas.
Canales, M. T. 2019. “Performance study of link slab continuity in prestressed concrete bridges.” Ph.D. thesis, Dept. of Civil Engineering, Louisiana State Univ.
Canales, M. T., and A. Okeil. 2019. “Parametric study of partially continuous bridge spans.” In Proc., 98th Transportation Research Board Annual Meeting. Washington, DC: Transportation Research Board.
Caner, A., and P. Zia. 1998. “Behavior and design of link slabs for jointless bridge decks.” PCI J. 43: 68–80. https://doi.org/10.15554/pcij.05011998.68.80.
Davidson, E., D. White, and L. Kahn. 2012. Evaluation of performance and maximum length of continuous decks in bridges: Part 2. Atlanta, GA: Georgia Institute of Technology (GADOT).
Davis, R. T., M. Thompson, B. Wood, J. Breen, and M. Kreger. 1999. Measurement-based performance evaluation of a segmental concrete bridge. Austin, TX: TXDOT, United States Federal Highway Administration, Univ. of Texas.
Ge, X., K. Munsterman, X. Deng, M. Reichenbach, S. Park, T. Helwig, M. D. Engelhardt, E. Williamson, and O. Bayrak. 2021. Designing for deck stress over precast panels in negative moment regions. Austin, TX: Center for Transportation Research, Univ. of Texas.
Gergess, A. N. 2019. “Analysis of bonded link slabs in precast, prestressed concrete girder bridges.” PCI J. 64 (3): 47–65. https://doi.org/10.15554/pcij64.3-03.
Gross, S. P., and N. H. Burns. 2000. Field performance of prestressed high performance concrete highway bridges in Texas. Austin, TX: Center for Transportation Research, Bureau of Engineering Research, Univ. of Texas.
Lam, C., D. Lai, J. Au, L. Lim, W. Young, and B. Tharmabala. 2008. “Development of concrete link slabs to eliminate bridge expansion joints over piers.” In Proc., 2008 Annual Conf. of the Transportation Association of Canada. Toronto, ON: Transportation Association of Canada.
Okeil, A. M., and A. ElSafty. 2005. “Partial continuity in bridge girders with jointless decks.” Pract. Period. Struct. Des. Constr. 10 (4): 229–238. https://doi.org/10.1061/(ASCE)1084-0680(2005)10:4(229).
Roberts, C. L., J. E. Breen, and M. E. Kreger. 1993. Measurement based revisions for segmental bridge design and construction criteria. Austin, TX: Univ. of Texas.
Snedeker, K., D. White, and L. Kahn. 2011. Evaluation of performance and maximum length of continuous decks in bridges: Part 1. Atlanta, GA: Georgia Institute of Technology (GADOT).
TxDOT (Texas DOT Bridge Division). 2016. PSTRS14 version 6.1 prestressed concrete beam design/analysis program user guide. Austin, TX: TxDOT.
Wing, K. M., and M. J. Kowalsky. 2005. “Behavior, analysis, and design of an instrumented link slab bridge.” J. Bridge Eng. 10 (3): 331–344. https://doi.org/10.1061/(ASCE)1084-0702(2005)10:3(331).
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© 2024 American Society of Civil Engineers.
History
Received: Jun 8, 2023
Accepted: Jan 6, 2024
Published online: Mar 28, 2024
Published in print: Jun 1, 2024
Discussion open until: Aug 28, 2024
ASCE Technical Topics:
- Bridge decks
- Bridge engineering
- Bridges
- Bridges (by type)
- Decks
- Design (by type)
- Engineering fundamentals
- Engineering mechanics
- Field tests
- Girder bridges
- Live loads
- Load factors
- Slabs
- Static loads
- Statics (mechanics)
- Stress (by type)
- Structural analysis
- Structural design
- Structural engineering
- Structural members
- Structural systems
- Tests (by type)
- Thermal loads
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