Behavior of Strengthened Post-tensioned Reinforced Concrete Box Girders
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Volume Title: ICASGE2023
DOI: ICASGE-RCS
Authors
Civil Engineering Department, Faculty of Engineering, Menoufia University
Abstract
Reinforced Concrete Box Girders (RCBGs) are important elements in concrete bridge structures, which resist loads acting on the carriage road. A box girders bridge is a kind of bridge in which the main beams comprise girders in the shape of a hollow box. Box girder bridges, especially post-tensioned, are one of the new developments in bridge engineering in the last recent years. The main objective of this research is to study the behavior of post -tensioned box girder strengthened with different composite materials on flexural behavior. The current work presents experimental work to construct and test five full scale box girders with dimensions of 350x 350x2500 mm. The girders were tested under flexure using two points loading up to failure. Two girders were tested as control girders. One of the control girders was tested without post -tensioned wires and the other was tested using 2 post-tensioned wires with a diameter of 12.7 mm and both of them without using any strengthening materials. The remaining three girders were strengthened with welded wire meshes, GeoGrid meshes and GFRP sheets. The structural behavior of tested specimens in terms of load-deflection curves, ultimate loads, cracking behavior and energy absorption were presented and discussed. The main conclusion was that the post -tensioned box girder strengthened by three layers of GFRP achieves the highest structural performance compared with the other strengthened post-tensioned box girders.
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