Improving flexural performance of post-tensioned pre-cast pre-stressed RC segmental T-beams

Afefy, Hamdy M.; Abdelaziz, Mohamed; Kassem, Nesreen M.; Mahmoud, Mohamed H.

doi:10.1016/j.istruc.2020.01.027

Cited by 6 publications

(1 citation statement)

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“…Afefy et al [37] experimentally tested seven T-shaped beams, five of them were precast segmental and assembled by dry shear keyed joints that internally prestressed, in addition to two reference beams for comparison. The segmented beams were strengthened at the joint location on the compression side by pouring half the depth of the upper flange with a layer of HPC.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Precast Segmental Beams Made of High-strength Concrete and Ultra-high Performance Fiber Concrete Connected by Shear Keys Technique

2022

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The segments of the precast concrete beams can be assembled by joints have interlaced shear keys. This paper presents an experimental and numerical study of ten samples, six of them were tested under the influence of direct shear; these samples represent reinforced and non-reinforced shear keyed joints made of high-strength concrete (HSC) and ultra-high performance fiber concrete (UHPFC) under the influence of different levels of confining stress. In addition, four beams were tested under the influence of bending, two of them are unconnected control beams made of HSC and UHPFC, and the other two beams are precast segmented and were assembled using reinforced shear keyed joints of the same joints tested under direct shear. All the details of the shear keyed joints are fixed in all samples and they are dry non-epoxy joints, the external prestressing technique was used. Also, Abaqus program was used for numerical modeling of all samples that were tested in the experimental program using the 3D solid element model. The success of the modeling process was verified by comparing the experimental and numerical results as the results of the relationship between load and displacement and also the failure pattern. From the experimental and numerical study, it was found that by reinforcing the shear keys and/or by increasing the confining stress of the joints made of HSC and UHPFC, the shear capacity of the joints is increased. If the value of the used confining stress is constant at a value of 3 N/mm2 and by reinforcing the shear keys with reinforcement, the maximum load increases by 18% and 48%, respectively, than its non-reinforced counterparts joints. It was also found that by increasing the confining stress of the reinforced shear keyed joints from 3 N/mm2 to 6 N/mm2, the maximum load value is increased by 18% and 16%, for HSC and UHPFC shear keyed joints, respectively.

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Section: Introductionmentioning

confidence: 99%