Title:
Development of a New Short-Span Bridge System — A Comprehensive Approach
Author(s):
Tevfik Terzioglu, Dongqi Jiang, Mary Beth D. Hueste, and John B. Mander
Publication:
Symposium Paper
Volume:
340
Issue:
Appears on pages(s):
137-158
Keywords:
precast prestressed concrete, bridge girders, spread slab beams, live load distribution factors
DOI:
10.14359/51725810
Date:
4/1/2020
Abstract:
A new bridge system was recently developed for short span bridges in low clearance areas. This system uses the same concept as spread box beam bridges in which standard TxDOT precast prestressed slab beams are spaced apart. The deck is composed of stay-in-place precast concrete panels spanning between beams with a cast-in-place reinforced concrete deck. This paper presents a comprehensive approach for the investigation and development of this alternative spread slab beam bridge system including design, construction, field testing, modeling, and derivation of live load distribution factors (LLDFs). A parametric design study was conducted to evaluate the potential bridge spans when considering the four standard TxDOT slab beam types, a range of beam spacings, and potential bridge widths. One of the challenging geometries with widely spaced slab beams was constructed at full-scale to assess constructability and in-service behavior. The full-scale test bridge and a recently constructed on-system bridge with more closely spaced slab beams were tested under static and dynamic truck loads to obtain important insight into their structural performance and live load distribution behavior, while also providing data to guide analytical and computational modeling studies. Finite element models were developed to investigate an array of possible bridge geometries and determine the effect of key parameters on the load sharing behavior. Based on the research findings, it was concluded that spread slab beam bridges with a topped panelized deck provide a viable construction method for short-span bridges. For both tested bridges, the desired performance was achieved for in-service loading. Experimental and computational LLDFs were evaluated, and LLDF equations for spread box beams were reviewed for applicability to spread slab beam bridges. The AASHTO LRFD spread box beam LLDFs range from being unconservative to very conservative. Unique moment and shear LLDFs were developed for use in design of spread slab beam bridges.
Related References:
AASHTO (2012). "AASHTO LRFD Bridge Design Specifications, 6th Edition." American Association of State Highway and Transportation Officials, Washington, DC.
Computers and Structures, I. 2015. CSiBridge, Integrated 3-D Bridge Analysis, Design and RatingComputers and Structures, Inc., Berkeley, California, USA.
Dassault Systemes, S. A. 2013. Abaqus, version 6. Abaqus, Inc, Providence, RI, USA.
Hueste, M. D., Mander, J. B., Terzioglu, T., Jiang, D., and Petersen-Gauthier, J. (2015). "Spread Prestressed Concrete Slab Beam Bridges." Research Report No. FHWA/TX-15/0 6722-1, Texas A&M Transportation Institute and Texas Department of Transportation.
Jiang, D. (2015). "Experiments, Analysis and Design Models for Slab on Prestressed Concrete Girder Bridge Structures." PhD, Texas A&M University, College Station, TX.
Jiang, D., Terzioglu, T., Hueste, M. B. D., Mander, J. B., and Fry, G. T. (2016). "Experimental Study of an In-service Spread Slab Beam Bridge." Engineering Structures, 127, 525-535.
Naaman, A. E. (2004). Prestressed Concrete Analysis and Design : Fundamentals, Techno Press, Ann Arbor, MI. PCI (2010). "PCI Design Handbook." Precast/Prestressed Concrete Institute (PCI), Chicago, IL.
Terzioglu, T. (2015). "Behavior and Design of Spread Prestressed Concrete Slab Beam Bridges." PhD Dissertation, Texas A&M University, College Station, TX.
Terzioglu, T., Jiang, D., Hueste, M. B. D., and Mander, J. B. (2016a). "Design and Constructability of Spread Slab- Beam Bridges." Journal of Bridge Engineering, 04016089.
Terzioglu, T., Jiang, D., Hueste, M. B. D., Mander, J. B., and Fry, G. T. (2016b). "Experimental Investigation of a Full-Scale Spread Slab Beam Bridge." Journal of Bridge Engineering, 04016082.
Terzioglu, T., Hueste, M. B. D., and Mander, J. B. (2017). "Live Load Distribution Factors for Spread Slab Beam Bridges." Journal of Bridge Engineering, 22(10).
TxDOT (2013). "TxDOT Bridge Design Manual - LRFD." Texas Department of Transportation, http://onlinemanuals.txdot.gov/txdotmanuals/lrf/lrf.pdf.
Zokaie, T., Imbsen, R. A., and Osterkamp, T. A. (1991). "Distribution of Wheel Loads on Highway Bridges." NCHRP Project Report 12-2612-26, Transportation Research Board, Washington, DC.
Zokaie, T. (2000). "AASHTO-LRFD Live Load Distribution Specifications." ASCE Journal of Bridge Engineering, 5(2), 131-138.