United States Department of Transportation
i
End region detailing of pretensioned concrete bridge girders.
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2013-03-01
[PDF-2.65 MB]
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-Design;NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;
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Abstract:End region detailing has significant effect on the serviceability, behavior, and capacity of pretensioned concrete girders.
In this project, experimental and analytical research programs were conducted to evaluate and quantify the effects of
different end region detailing schemes. Two end region design models were developed using results from the experimental
and analytical programs. The first model can be used to design confinement reinforcement to prevent lateral-splitting failure
at ultimate strength. The second model focuses on serviceability criteria and can be used to calculate bottom flange stresses
due to prestressing and thereby assess the likelihood of bottom flange cracking in the end region.
The experimental program was conducted using (14) Florida I-Beam (FIB) specimens. Cracking and strain data were
collected during prestress transfer and during the months following transfer. These data were used to evaluate serviceability
criteria. Following serviceability evaluations, specimens were load tested to determine capacity and behavior due to applied
loads. Specimens were loaded in three-point bending at a shear-span-to-depth (a/d) ratio of approximately 2.0. Variables
considered in the experimental work included confinement reinforcement, steel bearing plates, horizontal reinforcement,
vertical reinforcement, strand quantity, strand shielding, and strand layout.
The analytical program was conducted using finite element analysis (FEA). FEA models were validated using data from
the experimental program. Variables considered in the analytical program included bearing pad geometry, bearing pad
stiffness, steel bearing plates, transfer length, and prestress release sequence.
A test program was also conducted to evaluate the shear strength of 1950s era pretension girders used in the Florida
highway system. These girders are of interest because they have thin 4 in. webs and very little specified shear
reinforcement. Six test girders were removed from an existing bridge and were tested to failure in the laboratory. Results
from the testing will be useful in determining the shear strength of similar pretensioned girders.
Recommendations are provided with regard to detailing of confinement reinforcement, embedded bearing plates, strand
shielding, and crack control. Recommendations are also given regarding evaluation of early pretensioned girders.
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Alternate URL:http://ntl.bts.gov/lib/47000/47400/47429/FDOT-BDK75-977-05-rpt-A.pdf ; http://ntl.bts.gov/lib/47000/47400/47430/FDOT-BDK75-977-05-rpt-B.pdf ; http://ntl.bts.gov/lib/47000/47400/47431/FDOT-BDK75-977-05-rpt-C.pdf ; http://ntl.bts.gov/lib/47000/47400/47432/FDOT-BDK75-977-05-rpt-D.pdf ; http://ntl.bts.gov/lib/47000/47400/47433/FDOT-BDK75-977-05-rpt-E.pdf ; http://ntl.bts.gov/lib/47000/47400/47434/FDOT-BDK75-977-05-rpt-F.pdf ; http://ntl.bts.gov/lib/47000/47400/47435/FDOT-BDK75-977-05-rpt-G.pdf ; http://ntl.bts.gov/lib/47000/47400/47436/FDOT-BDK75-977-05-rpt-H.pdf ;
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