Strengthening of substandard lap splices using hollow steel section (HSS) collars

Ejaz, Ali; Ruangrassamee, Anat; Kruavit, Pochara; Udomworarat, Pison; Wijeyewickrema, Anil

doi:10.1016/j.istruc.2022.10.030

Cited by 11 publications

(4 citation statements)

References 47 publications

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“…This is because the length of embedment plays an important role in determining the bond strength and essentially it is inversely proportional to the bond strength between steel bar and concrete, as given in Eq. 1 [15,16].…”

Section: Resultsmentioning

confidence: 99%

Bond Strength of Steel Bars in Sustainable Concrete Made with Recycled Aggregates

Saingam,

Min,

Ejaz

et al. 2023

KEM

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Lately, considerable efforts have been directed towards investigating the practicality of using coarse recycled concrete aggregate as a potential substitute for natural coarse aggregate (NCA) in concrete construction. Research has shown that both the proportion of replacement and the properties of recycled aggregates play a significant role in affecting the tensile strength, compressive strength, and bonding characteristics of concrete. In certain cases, recycled aggregate concrete exhibits lesser mechanical properties when compared to concrete made with normal aggregates. The current study investigated the performance of Sika AnchorFix-1 to enhance the bond strength between steel bars and recycled aggregate concrete. The findings suggest that Sika AnchorFix-1 successfully prevented the concrete rupture in the case of concrete with recycled concrete aggregates, whereas concrete rupture could not be prevented in the case of concrete with recycled brick aggregates. Hence, a lower bond strength was obtained for specimens with recycled bricks aggregates than specimens with recycled concrete aggregates.

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Section: Resultsmentioning

confidence: 99%

Bond Strength of Steel Bars in Sustainable Concrete Made with Recycled Aggregates

Saingam,

Min,

Ejaz

et al. 2023

KEM

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“…Even with the ever-increasing development of sustainable materials [3][4][5][6] and use of alternative reinforcement [7], corrosion remains a worldwide issue causing millions of dollars in losses annually [8] and is a major contributor to the degradation of reinforced concrete structures. Furthermore, failures in reinforced structures can also be attributed to defects that are not related to engineering [9,10]. Deterioration due to the aging of reinforced concrete members necessitate the repair of concrete structures [11].…”

Section: Introductionmentioning

confidence: 99%

Behavior and Performance of Reinforced Concrete Columns Subjected to Accelerated Corrosion

Hameed

Afzal

Javed

et al. 2023

Metals

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Steel reinforcement corrosion in concrete structures such as bridges, industrial plants, marine structures, and coastal buildings is a growing concern due to its impact on cost, safety, and serviceability. Corrosion leads to spalling, cracking, and reduced reinforcement diameter, which can compromise structural integrity. This study examines the behavior of concrete columns with corroded reinforcement in two phases. In the first phase, 72 columns of 150 × 150 mm cross-sectional dimensions and 300 mm length were cast and subjected to an accelerated corrosion technique. The study examined variables such as concrete cover, concrete strength, and corrosion exposure. The second phase involved studying the axial behavior of corroded columns concerning the effect of column length. Column specimens of 150 × 150 mm cross-sectional dimensions and lengths of 500 mm, 700 mm, and 900 mm were cast, corroded, and tested under axial compressive load. The study revealed that a 30 mm concrete cover offers 10% more protection against corrosion than a 20 mm cover. Continuous exposure to a corrosive environment reduces the load-carrying capacity by 50%, while columns with 28 MPa concrete strength can carry 4% more load. Longer columns are more susceptible to corrosion, leading to a significant reduction in load-carrying capacity and concrete cover damage. Therefore, maintaining adequate concrete cover, strength, and regular inspections are essential to address steel reinforcement corrosion and preserve structural integrity.

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“…This was evident in the Hyogoken-Nanbu Earthquake of 1995, where concrete structures, especially reinforced concrete piers and rigid frames in elevated highways, suffered considerable damage. Upgrading these structures is essential to improve their resilience against future natural disasters [1,2].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Analytical Studies on Low-Cost Glass-Fiber-Reinforced-Polymer-Composite-Strengthened Reinforced Concrete Beams: A Comparison with Carbon/Sisal Fiber-Reinforced Polymers

Rodsin,

Ejaz,

Hussain

et al. 2023

Polymers

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This study presents an experimental framework with seventeen beams to investigate the impact of loading type, configuration, and through-bolt anchorage on LC-GFRP (Low-Cost Glass-Fiber-Reinforced Polymer) confinement performance. Beams underwent three-point and four-point bending, with LC-GFRP applied in various ways, including U-shaped, side-bonded, and fully wrapped, with and without anchors. The performance of LC-GFRP was compared to CFRP (Carbon-Fiber-Reinforced Polymer) and sisal wraps. LC-GFRP in side-bonded and U-shaped configurations without anchors under three-point bending showed no shear failure, while those under four-point bending without anchors experienced shear failure. With anchors, U-shaped configurations successfully prevented shear failure. The side-bonded, U-shaped, and U-shaped configurations along the full span with anchors demonstrated peak capacity enhancements of 72.11%, 43.66%, and 68.39% higher improvements than the corresponding configurations without anchors, respectively. Wrapping all sides of the beam with LC-GFRP or CFRP prevented shear failure without additional anchors, with complete wrapping being the most efficient method. When anchors were used, significant capacity enhancements were observed. Existing shear strength prediction models were evaluated, highlighting the need for more tailored expressions for LC-GFRP confinement, especially for non-U-shaped configurations.

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Strengthening of substandard lap splices using hollow steel section (HSS) collars

Cited by 11 publications

References 47 publications

Bond Strength of Steel Bars in Sustainable Concrete Made with Recycled Aggregates

Bond Strength of Steel Bars in Sustainable Concrete Made with Recycled Aggregates

Behavior and Performance of Reinforced Concrete Columns Subjected to Accelerated Corrosion

Experimental and Analytical Studies on Low-Cost Glass-Fiber-Reinforced-Polymer-Composite-Strengthened Reinforced Concrete Beams: A Comparison with Carbon/Sisal Fiber-Reinforced Polymers

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