Experimental Investigation of Segmental Post-tensioned Girders
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The structural behavior of precast concrete segmental bridges largely depends on the behavior of the joints between segments. In this research, series of static tests were carried out to investigate the behavior of full-scale post-tensioned segmental girders with different types of joint configuration; multi-key joint, single key, and plain key joint. The reference specimen was monolithically cast girder and the other specimens consisted of five segments for each one joined together with epoxy paste. The testing measurements included deflection, elongation of strands, cracking load, ultimate strength and strains at different locations and loading stages. The general theme abstracted from the results of cracking loads tests reflects an approximate similarity in the behavior of the four types of girder with slight differences. In the segmental girders with different types of joints, it was noticed that the cracks at the joints occurred in the concrete adjacent to the epoxy mortar which can be attributed to the high tensile strength of the used epoxy in comparison to concrete.
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Challenges in Mechanics of Time-Dependent Materials, Volume 2