Title:
Structural Behavior of Thin Prestressed Slab Beams in Bridges
Author(s):
Sinjaya Tan, C. H. Luu, Y. L. Mo, Thomas T. C. Hsu, and Abdeldjelil Belarbi
Publication:
Structural Journal
Volume:
113
Issue:
2
Appears on pages(s):
287-299
Keywords:
anchorage bond; design equations; full-scale tests; prestressed concrete beam
DOI:
10.14359/51688196
Date:
3/1/2016
Abstract:
This research was carried out to investigate the behavior of thin prestressed slab beams (TPSBs) that are part of the Department of Transportation’s inventory, including TxDOT. Fourteen TPSBs were tested to study the structural behavior and the effects of several variables, such as height, cast-in-place deck, shear span-depth ratio (a/d), prestressing steel ratio, transverse steel ratio, and longitudinal reinforcement at the prestress-transfer zone. The tests showed that shear was not the predominant failure mode, even under very small shear span-depth ratios (a/d ≈ 1.2). In most cases, failures of TPSBs were governed by either anchorage bond or flexure. When compared to the current building and bridge codes, the test results showed that both ACI 318 and AASHTO LRFD cannot predict the strength and the failure mode of TPSBs reasonably. As a result, a design equation is derived based on anchorage bond and flexural capacities.
Related References:
AASHTO, 2010, “LRFD Standard Specifications for Highway Bridges, Fifth Edition,” American Association of State Highway and Transportation Officials, Washington, DC, pp. 5-36 - 5-92.
ACI Committee 318, 2011, “Building Code Requirements for Structural Concrete (ACI 318-11) and Commentary,” American Concrete Institute, Farmington Hills, MI, 503 pp.
Barnes, R. W.; Grove, J. W.; and Burns, N. H., 2003, “Experimental Assessment of Factors Affecting Transfer Length,” ACI Structural Journal, V. 100, No. 6, Nov.-Dec., pp. 740-748.
Cousins, T. E.; Johnston, D. W.; and Zia, P., 1990, “Transfer and Development Length of Epoxy Coated and Uncoated Prestressing Strand,” PCI Journal, V. 35, No. 4, pp. 92-103. doi: 10.15554/pcij.07011990.92.103
Flexicore, 2014, http://www.flexicoreoftexas.com/products_prestressed.asp. (last accessed Jan. 20, 2016)
Hanson, N., and Kaar, P., 1959, “Flexural Bond Tests of Pretensioned Beams,” ACI Journal Proceedings, V. 55, No. 1, Jan., pp. 783-802.
Martí-Vargas, J. R.; Serna, P.; and Hale, W. M., 2013, “Strand Bond Performance in Prestressed Concrete Accounting for Bond Slip,” Engineering Structures, V. 51, pp. 236-244. doi: 10.1016/j.engstruct.2013.01.023
Martin, L. D., and Korkosz, W. J., 1995, “Strength of Prestressed Concrete Members at Sections Where Strands Are Not Fully Developed,” PCI Journal, V. 40, No. 5, pp. 58-66. doi: 10.15554/pcij.09011995.58.66
Mitchell, D.; Cook, W. D.; Khan, A.; and Tham, T., 1993, “Influence of High Strength Concrete on Transfer and Development Length of Pretensioning Strand,” PCI Journal, V. 38, No. 3, pp. 52-66. doi: 10.15554/pcij.05011993.52.66
Narer, J., 1997, “A New Generation of Precast Prestressed Concrete Slab Bridges for Maryland’s Rural Highways,” PCI Journal, V. 42, No. 3, pp. 16-20. doi: 10.15554/pcij.05011997.16.20
Olesniewicz, A., 1975, “Statistical Evaluation of Transmission Length of Strand,” Research and Design Centre for Industrial Building BISTYP, Warsaw, Poland.
Ratz, E.; Holmjanski, M.; and Kolner, V., 1958, “The Transmission of Prestress to Concrete by Bond,” Proceeding 3rd Congress of the Federation Internationale de la Precontrainte, pp. 624-640.
Tan, S., 2014, “Structural Behavior of Thin Prestressed Slab Beams in Bridges,” PhD dissertation, University of Houston, Houston, TX, 556 pp.
Tan, S.; Luu, C. H.; Mo, Y. L.; Hsu, T. T. C.; and Belarbi, A., 2014, “Shear Behavior of Thin Prestressed Slab Beams in Bridges,” Technical Report 0-6720-1, University of Houston, Houston, TX, 268 pp.
TxDOT, 2014, https://www.dot.state.tx.us. (last accessed Jan. 20, 2016)
Zia, P., and Mostafa, T., 1977, “Development Length of Prestressing Strands,” PCI Journal, V. 22, No. 5, pp. 54-65. doi: 10.15554/pcij.09011977.54.65