Abstract
Two of the main advantages of segmental construction are economics, as well as the rapid construction technique. One of the forms of segmental construction, for structural elements, is the segmental beams that built-in short sections, which referred to segments. This research aims to exhibit a new technique for the fabrication of short-span segmental beams from wedge-shaped concrete segments and carbon fiber reinforced polymers (CFRP) in laminate form. The experimental campaign included eight short-span segmental beams. In this study, two selected parameters were considered. These parameters are; the number of layers of CFRP laminates and the adhesive material that used to bond segments to each other, forming short-span segmental beams. The test results showed that for segmental beams reinforced by 2-layer of CFRP laminates, undergoes less deflection and sustained considerable ultimate loading value of 38.4%–104% than beams reinforced by 1-layer. Moreover, the test of segmental beams fabricated by adhering to the concrete segments with epoxy resin exhibited an increase in ultimate loading by 16%–65% than beams constructed using cementitious adhesive for bonding the wedge-shaped segments. Theoretically, segmental beams were analyzed by the American Concrete Institute (ACI) 440.2R-17 procedure with slight modifications. The analysis gave an overestimation of flexural strength for segmental beams when compared with experimental outcomes.
Highlights
Segmental beams are generally fabricated in two methods according to either the structural application or their purposes
The first method is by casting concrete in-situ in individual molds, and the second one is by using precast prestressed concrete segments
Large scale segmental beams used for the construction of bridges overall the world
Summary
Segmental beams are generally fabricated in two methods according to either the structural application or their purposes. The first method is by casting concrete in-situ in individual molds, and the second one is by using precast prestressed concrete segments. Segmental construction by precast units has numerous features. The quality of concrete is ensured as well as less working loads during construction phases in the site can be achieved, the speed of construction can be increased, and environmental effects can be alleviated [1]. Large scale segmental beams used for the construction of bridges overall the world. Segmental beams may be straight or curved aligned, and they are fast, flexible, high quality, and economical construction techniques. The type of interface joint between individual segments, quality of joints, and mechanical interlock between segments will affect the behavioral performance of segmental bridges [2,3]
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