Behavior of Repairing Composite I-Section Beams with Opening under Ultimate Torque

Amli, Ali Sabah Ahmed Al; Al‐Ansari, Nadhir; Abtan, Yaarub G.

doi:10.4236/eng.2018.104014

Cited by 5 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, it is necessary to compare the presentation of various Fiber-Reinforced Polymer rods in order to develop further design principles and suggestions. In order to improve the behavior of flawed flat slabs, this study compares investigational studies using carbon fiber reinforced polymer, aramid fiber reinforced polymer, standard steel bolts, and sisal [12]. To determine the best shear reinforcement type and configuration to use near columns in flat slabs, several configurations of the aforementioned shear reinforcements are also evaluated [13].…”

Section: Benefits Of Fiber Reinforced Polymermentioning

confidence: 99%

Increasing the Punching Shear Capacity of Flat Plate Reinforced Concrete Utilizing CFRP Warp and Bar

Abed,

Beddu,

Itam

et al. 2024

MMEP

View full text Add to dashboard Cite

This research investigates the use of carbon fiber reinforced polymer (CFRP) sheet and bar in concrete to increase punching shear capacity. The study focuses on the use of 1000×1000×100 mm 3 reinforced flat plates and their flexure in both directions. The flat plates are subjected to a single-point load and a column stub. CFRP has a high modulus of elasticity and low coefficient of thermal expansion. Fifteen reinforced concrete flat plates were investigated, with three without FRP as control flat plates and twelve divided into two groups. The results showed that using CFRP composites to reinforce slabs at columns postponed the first slab flexural fractures, resulting in an increase in slab 2's ultimate punching shear capacity of 127.4 kN to 141.2 kN and a rise in sustained deflection from 33 mm to 46 mm. Strengthening slabs with CFRP delays the onset of concrete cracking and increases the initial slab stiffness by about 20% compared to an non-reinforced slab. Ultimate punching shear capacity improved using CFRP, making it on par with the slab without apertures. This research highlights the importance of using CFRP in concrete manufacturing systems to prevent failures and ensure long-term stability.

show abstract

Section: Benefits Of Fiber Reinforced Polymermentioning

confidence: 99%

Increasing the Punching Shear Capacity of Flat Plate Reinforced Concrete Utilizing CFRP Warp and Bar

Abed,

Beddu,

Itam

et al. 2024

MMEP

View full text Add to dashboard Cite

show abstract

“…Also, they noticed increased stiffness and cracking torsional moments in the tested beams. Al Amli et al [15] studied the behavior of composite concrete beams cracked by pure torsional loading and then repaired by external strengthening with CFRP. Four composite I-beams were cast with CFRP laminates.…”

Section: Introductionmentioning

confidence: 99%

Torsional Behavior of CFRP Strengthening of SCC Box Beams with Web Openings under Repeated Loading

Mahdi,

Abbas

2023

Civ Eng J

View full text Add to dashboard Cite

Monotonic and repeated torsional loading frequently occur in many concrete structures. The loading and unloading action of repeated torsion places structures under greater damage and risk of failure than other types of loading. Therefore, keeping old infrastructure maintained, repaired, and upgraded has become an important priority and requirement. In this research, experimental work was done on pre-cracked self-compacted reinforced concrete box beams repaired (strengthened) with CFRP sheets to investigate the effect of web openings and CFRP sheets on the torsional behavior of tested specimens. Two groups of sixteen half-scale CFRP-strengthened RC box beams with different numbers of circular openings in the web, with a diameter of about 30% of the hollow box depth, were investigated. The first group (I), tested under monotonic torsional loading, comprised four unstrengthened RC beams and another four beams strengthened with CFRP strips, whereas the second group (II) consisted of the same details as the first one tested under repeated loading. The range of the repeated loading was about 30% and 60% of the ultimate load of the monotonic tests. The effect of opening and repairing (strengthening) with CFRP on the ultimate and cracking Torques, Torque-Twist Angle, steel strains, and modes of failure were displayed and discussed. Cracking and ultimate torques and the angle of twist of the tested beams were significantly reduced due to openings in the web, accompanied by increased values for the steel strains due to the presence of openings. However, the results showed that using CFRP strengthening techniques increased torsional strength, angle of twist, and decreased steel strain for all the tested beam specimens. Results revealed that repeated loading causes inelastic deformations in proportion to the number of loading cycles, more than static load deformations. Doi: 10.28991/CEJ-2023-09-12-06 Full Text: PDF

show abstract

“…The cracking torque, ultimate torque, mode of failures, and angle of twist of the beams are discussed through this study. Many researches were studied the behavior of beams with many sections, materials, reinforcement and repairing with the Torque effect [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Behavior of Reinforced Concrete Beams with effect of Stiffened Plates

Amli

Shakir

Abdulredha³

et al. 2019

Civ Eng J

Self Cite

View full text Add to dashboard Cite

This study presents experimental work including an investigation conducted on five simply supported reinforced concrete beams under pure torsion. First beam without strengthening as a control beam. The other four beams were strengthened externally by bolted thin steel plates. For this test the load was applied gradually. The torque was increased gradually up to failure of the beam. The variables were the thickness and height of the steel plate that was externally connected to both sides of the rectangular reinforced concrete beam. The test results for the beams discussed are based on torque-twist behavior. The experimental results show that the attachment of thin steel plates by mechanical means to beams provides a considerable improvement in the torsional behavior of the reinforced concrete beams. Comparable to the reference beam, the maximum increase in the cracking and the ultimate torque of the composite beam was recorded for the reinforced concrete beam that strengthen by steel plate of (150) mm height, (2mm) thickness and (50mm) spacing between shear connectors (B1). The results revealed that the cracking torque, ultimate torque, global stiffness of beam and beam ductility for all composite beams increase with the increase of the plate's thickness, plate's height.

show abstract

Behavior of Repairing Composite I-Section Beams with Opening under Ultimate Torque

Cited by 5 publications

References 7 publications

Increasing the Punching Shear Capacity of Flat Plate Reinforced Concrete Utilizing CFRP Warp and Bar

Increasing the Punching Shear Capacity of Flat Plate Reinforced Concrete Utilizing CFRP Warp and Bar

Torsional Behavior of CFRP Strengthening of SCC Box Beams with Web Openings under Repeated Loading

Behavior of Reinforced Concrete Beams with effect of Stiffened Plates

Contact Info

Product

Resources

About