Effect of tension lap splice on the behavior of high strength self-compacted concrete beams

El-Azab, Mahmoud A.; Mohamed, Hatem M.; Farahat, Ahmed

doi:10.1016/j.aej.2014.01.009

Cited by 14 publications

(11 citation statements)

References 2 publications

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“…However, the experiment did not measure the possibility of the slippage of the reinforcement in the spliced zone. What can simply be pointed out from the current experimental results is that there is a minimum splice length of tensile reinforcement to meet a comparable stiffness with the corresponding beam with non-spliced reinforcement [27].…”

Section: Stiffness Index (Si)mentioning

confidence: 72%

“…The findings are consistent with that found in the literature where beams with sufficient tensile splice length show a flexural failure mode. On the contrary, beams with short splice length demonstrate a splitting failure mode [27]. For the case of plain reinforcement, insufficent splice length more likely to cause a slippage (pull out) failure mode rather than splitting failure [24].…”

Section: Crack Patternmentioning

confidence: 99%

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Flexural performance of reinforced HS-HVFA-SCC beam with spliced plain bar

2022

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This research presents the use of flexural performance criteria for determining the required spliced length of tensile plain bar embedded in unconfined high strength-high volume fly ash-self compacting concrete (HS-HVFA-SCC) beam. Subsequently, the obtained splice length is compared with the splice length database of other concrete types. For the purpose of the investigation, five beams are designed with various spliced bars within the pure bending area. In addition, a beam with continuous bar is prepared as a reference beam. The beams are tested by a four-point loading scheme. The results show that splice lengths within a 342–570 mm (34.2db–57db) range provide sufficient development of strength in the reinforcements to sustain a higher flexural load than the reference beam. However, in term of stiffness and ductility, only beams with a splice length of at least 380 mm (38db) are superior compared to the reference beam. Based on the above consideration, the minimum splice length of tensile plain reinforcement for the investigated beams is 380 mm (38db). Comparison of the result with other concrete types suggests that the required splice length of tensile plain bar embedded in HS-HVFA-SCC follows the equations for estimating splice length of general concrete and self-compacting concrete (SCC) even though the equations are derived for deformed bars. This finding implies that an efficient splice length in HS-HVFA-SCC beam can be expected. Article Highlights HS-HVFA-SCC beam with a lap-spliced plain bar of 38db gives an equal flexural performance to the beam with continuous bar. The required splice length of plain bar in HS-HVFA-SCC beam is comparable to that of deformed bar in other concrete types. An expected efficiency of splice length can encourage the use of HS-HVFA-SCC for a variety of structural applications.

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Section: Stiffness Index (Si)mentioning

confidence: 72%

Section: Crack Patternmentioning

confidence: 99%

Flexural performance of reinforced HS-HVFA-SCC beam with spliced plain bar

2022

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“…The experimental results of the current research in addition to the results of previous work were used to validate the proposed model. Eighty-three beams splice specimens of Darwin et al, 14 70 beams splice specimens of Azizinamimi et al, 28 and three direct tension splices of the current research were used. Nineteen beams splice specimens were eliminated from verification because they failed away of splice due to other reasons.…”

Section: Validation Of the Proposed Modelmentioning

confidence: 99%

“…Not only the bond strength is affected by increasing the concrete cover and bar spacing, but also mode of failure can be altered. 4,5,14,15 Pullout failure is recorded for cases with large concrete cover and bar spacing; however, splitting tensile failure takes place for smaller concrete cover and bar spacing. In addition, pullout failures can take place with slightly observed splitting cracks in case of spliced bars with a proper confinement (ACI 408R-03).…”

Section: Introductionmentioning

confidence: 99%

Experimental and analytical study on tension lap splices in nonconventional concrete using different techniques

Fawzy

Khalil

Atta

et al. 2020

Structural Concrete

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An experimental and analytical study on 15 specimens of lap splices embedded in nonconventional concrete without confining reinforcement was performed under direct tension. The experimental program involved two groups of straight-ended and anchored-ended bars; three different techniques were employed with different splice lengths. For straight-ended bars, conventional lap splice was studied as a benchmark. The anchored-ended steel bars were hooks, hooks intersecting with cross bars, and plate-end bars. It was found that, the used techniques not only achieved higher tensile stress at failure, but also different modes of failure were observed. Besides, a splice length of five times bar diameter was found to be sufficient to achieve the nominal yield stress of the reinforcing steel bar in the case of anchored-ended bars. Finally, an analytical model was proposed in order to predict the ultimate tensile stress of the straight-ended spliced bars. The accuracy of the proposed model was verified against the test results of 137 existing specimens from previous research. The comparison showed good agreement between the results of the proposed model and the test results.

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“…El Azab vd. [9] ise yüksek dayanımlı kendiliğinden yerleşen beton kullanılan çekme bölgesinde bindirme ekine sahip kirişlerin davranışına donatı çapı, oranı, bindirme boyu uzunluğu ve betonun kiriş üzerindeki döküm konumunun etkisini incelemiştir.…”

unclassified

Kirişlerde Bindirme Boyu Değişiminin Davranış Üzerindeki Etkinliğinin Deneysel Olarak İncelenmesi

Yaman¹,

Bensaoud²,

Gündoğay³

et al. 2022

acperpro

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Mevcut betonarme binaların büyük çoğunluğu düşük beton dayanımı, enine ve boyuna donatı yetersizliği, yetersiz bindirme boyu gibi zayıflıklara sahiptir. Bu çalışmada, bindirme uygulanan betonarme kiriş elemandaki bindirme boyu değişiminin eleman davranışı üzerindeki etkinliği deneysel olarak incelenmiştir. Deneyler sırasında düşey yük ve kiriş orta seviyesindeki yerdeğiştirme değerleri ölçülmüş ve elde edilen sonuçlar grafiklerle sunulmuştur. Grafiklerden yararlanılarak kiriş elemanların yük taşıma kapasitesi, rijitliği, sünekliği ve enerji tüketme kapasitesi hesaplanmış ve kıyaslamalar yapılmıştır. Referans numune ile yeterli bindirme uzunluğu bulunan numunelerde sünek hasar gözlenirken, yetersiz bindirme uzunluğu bulunan numunede gevrek ani hasar oluşmuştur. Bindirme boyunun yetersiz olması durumunda numune eğilme kapasitesine bile ulaşamadan ani olarak güç tükenmesine ulaşmıştır. Dolayısıyla yük taşıma kapasitesinde %28, enerji tüketme kapasitesinde %96 ve sünekliğinde %84 azalma ortaya çıkmıştır. Bu durum betonarme yapı elemanlarında özellikle kaçınılması gereken gevrek hasara neden olmaktadır.

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Effect of tension lap splice on the behavior of high strength self-compacted concrete beams

Cited by 14 publications

References 2 publications

Flexural performance of reinforced HS-HVFA-SCC beam with spliced plain bar

Flexural performance of reinforced HS-HVFA-SCC beam with spliced plain bar

Experimental and analytical study on tension lap splices in nonconventional concrete using different techniques

Kirişlerde Bindirme Boyu Değişiminin Davranış Üzerindeki Etkinliğinin Deneysel Olarak İncelenmesi

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