Shear design of high strength concrete prestressed girders

Labib, Emad; Dhonde, Hemant B.; Hsu, Thomas T. C.; Mo, Y. L.

doi:10.1007/s11709-014-0087-7

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…In this paragraph, results of large beams tested in the lab are summarized and the failure mode is analyzed. (Labib et al, 2014) tested large prestressed bulb-T girders with a span length of 7.62 m = 25 ft, and observed shear-tension and flexure-shear cracking in the girders. In specimens with low amounts of transverse reinforcement, failure occurred right at formation of the shear crack.…”

Section: Literature Reviewmentioning

confidence: 99%

Shear Experiments of Prestressed Concrete Bridge Girders

Lantsoght,

Zarate,

Zhang

et al. 2021

ACI Structural Journal

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For the assessment of existing slab-between-girder bridges, the shear capacity and failure mode are under discussion. Previous research showed that the static and fatigue punching capacity of the slabs is sufficient as a result of compressive membrane action. The girders then become the critical elements. This research studies the shear capacity of prestressed concrete bridge girders. For this purpose, four (half) girders were taken from an existing bridge that was scheduled for demolition and replacement and tested to failure in the laboratory. Two loading positions were studied. The results show that there should be a distinction between the mode of inclined cracking and the actual failure mode. In addition, the results show that for prestressed concrete girders the influence of the shear span to depth ratio should be considered for shear span to depth ratios larger than 2.5. These insights can be used for the assessment of existing slab-between-girder bridges in the Netherlands.

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Section: Literature Reviewmentioning

confidence: 99%

Shear Experiments of Prestressed Concrete Bridge Girders

Lantsoght,

Zarate,

Zhang

et al. 2021

ACI Structural Journal

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“…Researchers have attempted to strengthen the shear capacity of concrete structures by improving concrete materials. For example, steel bre-reinforced concrete [6][7][8][9], ultra-high-performance concrete [10][11][12][13][14][15], polymer mortar [16,17], and other materials [18][19][20] have been used to improve the mechanical properties of concrete beams, thereby enhancing their shear capacity. Steel plates or ber reinforced polymer [12,[21][22][23][24][25][26] have been used to enhance the shear strength of beams.…”

Section: Introductionmentioning

confidence: 99%

Strengthening Shear Resistance of Beams without Web Reinforcements Using Vertical Prestressed Steel Bars

Liu¹,

Cui

Wang

et al. 2022

Advances in Materials Science and Engineering

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Ensuring the shear capacity of concrete structures is crucial. The vertical prestressed steel bar (VPSB) strengthening method is effective for improving the shear behaviour of concrete structures. Four concrete beams are investigated to reveal the effect of VPSBs on the shear capacity of concrete beams without web reinforcement. Test results indicate that the shear capacity of the test beam strengthened by VPSBs in the beam is significantly increased by more than 95%, and the failure mode of the test beam changes from diagonal tension failure to shear compression failure. Additionally, the results provide insights into the strengthening mechanism of VPSBs, i.e., the shear contribution of the VPSBs can be categorised into two stages. The vertical compressive stress provides shear contribution in the first stage and provides control in terms of crack development; meanwhile, in the second stage, the stirrup action by VPSBs contributes to shear.

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Effectiveness of external prestressing in enhancing the non-ductile hanger failure mechanism in reinforced concrete inverted T-beams

Atta,

Behiry,

Haraz

2024

Front. Struct. Civ. Eng.

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Recently, inverted T-beams have been used in reinforced concrete (RC) bridges to support transverse precast stringers. Inverted T-beams, contrary to practice with conventional beams, are loaded on the flanges upper surface. This loading configuration causes hanger failure due to the generation of vertical tensile stresses near the bottom of the web. The key purpose of this study is to investigate the efficiency of vertical external prestressing stainless-steel bars in mitigating non-ductile hanger failure in reinforced concrete inverted T-beams. An experimental study on six inverted-T beams, including two un-strengthened specimens, was carried out. The study showed that the value of the prestressing level had a considerable impact on the performance of hanger mechanism in relation to crack pattern, ultimate loads, cracking behavior, load–deflection, strains, and ductility. The experimental results indicated that the suggested method for strengthening inverted T-beams had efficacy in reducing the seriousness of the non-ductile hanger failure and resulted in a strength increase of up to 53% when compared to that of the un-strengthened specimen. Additionally, two analytical models for estimating the hanger capacity and the average crack width of the strengthened RC inverted T-beams were proposed. The models that were proposed exhibited a high degree of agreement with the experimental results.

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Shear design of high strength concrete prestressed girders

Cited by 5 publications

References 2 publications

Shear Experiments of Prestressed Concrete Bridge Girders

Shear Experiments of Prestressed Concrete Bridge Girders

Strengthening Shear Resistance of Beams without Web Reinforcements Using Vertical Prestressed Steel Bars

Effectiveness of external prestressing in enhancing the non-ductile hanger failure mechanism in reinforced concrete inverted T-beams

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