Abstract
Precast segmental construction is widely used in the bridge structures erected by the balanced-cantilever method. The joints are obviously of the utmost importance in connecting the precast segments of bridge girders. In addition to the girders, the joints between segments should be capable of transferring compression, shear, and torsion forces. The basic requirements for match-cast joints are summarized. The joints between segments in many precast concrete bridges constructed by balanced cantilever method were inspected during construction and in service. The results of field survey that are presented in this paper included 5 major bridges. The spans are all precast box girders of constant or varying cross-section. Studies were conducted to determine the geometry and mechanical properties of grouted and match-cast joints. Classification of joint defects is presented. Statistics are given on the defects observed in some boxgirder segmental joints. Photographs of typical joint problems are included.
Highlights
Segmental post-tensioned concrete box girder bridges, both cast-in-place and precast, were introduced in bridge construction during the post World War II reconstruction period
The precast segmental construction is widely used in the bridge structures erected by balanced-cantilever method
The joints between segments in many precast concrete bridges constructed by balanced cantilever method were inspected during construction and in service
Summary
Segmental post-tensioned concrete box girder bridges, both cast-in-place and precast, were introduced in bridge construction during the post World War II reconstruction period. The development of precast segmental construction is generally attributed to France and former USSR. Several precast bridges and overpasses of this type were built successfully in Lithuania. The frame and continuous beam bridges, made of precast segments, were erected by the balanced cantilever method of construction using internal post-tensioning and mainly epoxy-jointing techniques. The segmental construction was proposed on the basis of the following advantages: speed and ease of erection when compared to cast-in-place concrete; elimination of the falsework over waterways or when traffic must be maintained under the bridge during construction; better control of concrete strength, shrinkage and creep because segments are normally cured to full strength in the factory-controlled conditions. One of the main factors encouraging the design of precast segmental bridges in Lithuania was the shortage and high relative cost of the structural steel
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