Anchorage Strength of Closely-Spaced Hooked Bars

Ajaam, Ali Hussein; Yasso, Samir; Darwin, David; O’Reilly, Matthew; Sperry, Jayne

doi:10.14359/51702065

Cited by 8 publications

(7 citation statements)

References 4 publications

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“…A database collected in the specialized literature about pullout tests on specimens of beam-column connection elements in reinforced concrete is confronted with values of resistant capacity estimated by mathematical models provided for in the ACI 318 (2019) and NBR 6118 (2014) standards, to assess their accuracies and identify factors that have the greatest influence on resistance capacity. Other studies with a similar scope were carried out by Ajaam, A. et al (2017), Ajaam, A. et al (2018), Lima, N.W.B. (2019), Marques, J.L.G.…”

Section: Introductionmentioning

confidence: 71%

Anchorage Strength of Beam-Pillar Connections in Reinforced Concrete With Bars and Type L Connectors

Lacerda¹,

Araujo²,

Ferro³

et al. 2022

JER

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The conventional technique of anchoring in reinforced concrete beamcolumn connections by simple adhesion with straight steel bars can result in extensive anchorage length, according to the amplitude of the requests, harming the economy and aesthetics of the architectural project by forcing the enlargement of the column. Known solutions for transferring stresses between steel and concrete include anchoring combined adhesion with mechanical devices: pins, hooks or bends. The design of the connections of structural elements is done by applying mathematical models proposed by the technical standards, whose different calculation methodologies can result in discrepancies in the predictive analysis of the anchorage resistance with potential impacts on the costs and safety of the building. This work investigates the factors that influence the resistant capacity of beam-column connections molded with right-angle bending bars, confronting the accuracy of the ACI 318 (2019) and NBR 6118 (2014) standards for estimating the resistance of the set to the stresses. After analyzing the test data collected in the specialized literature and comparing their results with the values estimated analytically by the calculation models of the aforementioned standards, it was concluded that both codes meet the safety requirements, with the NBR being more conservative. The anchorage length proved to be the main factor influencing the anchorage efficiency, together with coverage and the compressive strength of the concrete.

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Section: Introductionmentioning

confidence: 71%

Anchorage Strength of Beam-Pillar Connections in Reinforced Concrete With Bars and Type L Connectors

Lacerda¹,

Araujo²,

Ferro³

et al. 2022

JER

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“…A statistical comparison was made between the proposed procedure, AASHTO LRFD, 11 ACI 318–19, 12 and MC2010 13 . Three data sets were considered: i) the ACI 408 Tension Lap Splice Database 29 ; ii) the standard hook database compiled by Ajaam et al, 31 and iii) headed bars tested by Ghimire et al 8 Partial material safety factors were taken as 1.0 in all calculations where they appeared (i.e., for MC2010 13 ). Reinforcement grade factors were based on the estimated/measured reinforcement stress, rather than the yield stress.…”

Section: Resultsmentioning

confidence: 99%

“…The standard hooked bar database compiled by Ajaam et al 31 was used to validate the proposed procedure for the development of standard hooks in tension. Table 3 summarizes the analyzed data.…”

Section: Resultsmentioning

confidence: 99%

“…Ajaam et al 31 concluded that the development length of closely spaced and staggered hooks, as well as those with low levels of confinement reinforcement, were at risk of being underpredicted by ACI 318–14 35 (note that this is the expression the current AASHTO LRFD 11 equation is based on). As a result of their observations, the confinement reinforcement factor ( λ rc or Ψ r ) is more unforgiving in ACI 318–19 12 than in the AASHTO LRFD 11 .…”

Section: Resultsmentioning

confidence: 99%

Section: Standard Hooks In Tensionmentioning

confidence: 99%

See 2 more Smart Citations

Unified approach for reinforcement development length using the partly cracked elastic stage for bond strength

Zaborac

Bayrak

2022

Structural Concrete

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Current structural design codes in the United States treat the development of straight bars/lap splices, standard hooks, and deformed headed bars with separate equations. The fib Model Code 2010, on the other hand, uses a more unified approach. Recent changes to the standard hook and headed bar equations in the ACI 318-19 Building Code Requirements for Structural Concrete have sparked conversation about the discrepancies between ACI 318-19 and the AASHTO LRFD Bridge Design Specifications within the bridge design community. The objective of this research was to develop and validate a unified approach for the design/evaluation of reinforcement anchorage. A procedure based on the partly cracked elastic stage of bond was proposed. The proposed procedure was validated with 1006 tests from the literature.

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Effect of alkali silica reaction on the performance of hooked bars

Mirzagulpour,

Yousefpour,

Mozafari

2024

Construction and Building Materials

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Anchorage Strength of Closely-Spaced Hooked Bars

Abstract: The effect of close spacing on the anchorage strength of standard hooks is investigated. Sixty-seven simulated beam-column joint specimens were tested, each containing three, four, or six No. 5, 8, or 11 (No. 16, 25, or 36)

Cited by 8 publications

References 4 publications

Anchorage Strength of Beam-Pillar Connections in Reinforced Concrete With Bars and Type L Connectors

Anchorage Strength of Beam-Pillar Connections in Reinforced Concrete With Bars and Type L Connectors

Unified approach for reinforcement development length using the partly cracked elastic stage for bond strength

Effect of alkali silica reaction on the performance of hooked bars

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