Continuous prestressed concrete girder bridges, volume 2 : analysis, testing, and recommendations.
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2016-12-01
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Abstract:The Texas Department of Transportation designs typical highway bridge structures as simple span systems using
standard precast, pretensioned girders. Spans are limited to about 150 ft due to weight and length restrictions on
transporting the precast girder units from the prestressing plant to the bridge site. Such bridge construction, while
economical from an initial cost point-of-view, may become somewhat limiting when longer spans are needed. This
project focused on developing additional economical design alternatives for longer span bridges with main spans
ranging from 150–300 ft, using continuous precast, prestressed concrete bridge structures with in-span splices.
Phase 1 of this study focused on evaluating the current state-of-the-art and practice relevant to continuous precast
concrete girder bridges and recommending suitable continuity connections for typical Texas bridge girders; the
findings are documented in the Volume 1 project report. This report summarizes Phase 2 of the research including
detailed design examples for shored and partially shored construction, results of a parametric design study, and
results of an experimental program that tested a full-scale girder containing three splice connections. The parametric
design study indicated that for bridges spanning from 150–300 ft, continuous precast, prestressed concrete girder
bridges with in-span splices can provide an economical alternative to steel girder bridges and segmental concrete
box girder construction. The tested splice connections performed well under service level loads. However, the lack
of continuity of the pretensioning through the splice connection region had a significant impact on the behavior at
higher loads approaching ultimate conditions. Improved connection behavior at ultimate conditions is expected
through enhanced connection details. Recommendations for design of continuous spliced precast girders, along
with several detailing suggestions are discussed in the report.
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