Behavior Of Structural Macrosynthetic Fiber-Reinforced Precast, Prestressed Hollow-Core Slabs at Different Flexure-to-Shear Ratios

Kankeri, Pradeep; Pachalla, Sameer Kumar Sarma; Thammishetti, Nikesh; Prakash, Shamsher

doi:10.15554/pcij64.3-01

Cited by 5 publications

(3 citation statements)

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“…This end zones configuration cannot represent the real scheme of HCS supports in which widths of 100-150 mm are usual. [192] The results demonstrated the efficiency of macrosynthetic fibres in increasing both shear and flexural strength in all the studied a/d. As expected, and based on Kani's valley [148], at small a/d ratios, shear was predominant in the MOF of slabs.…”

Section: Shear In Frc Hcsmentioning

confidence: 71%

“…The applicability of polypropylene fibres as shear reinforced in HCS has not been explored in-depth, and limited information is available in the literature. Kankeri et al [192] studied in 2019 the structural effect of macrosynthetic fibres on HCS at three different a/d (2.5, 3.75, 7.50). Two slabs were tested for each a/d, one containing fibres at a 0.33% volume fraction (3 kg/m 3 ), and the second w/o any type of transverse reinforcement; i.e.…”

Section: Shear In Frc Hcsmentioning

confidence: 99%

“…Nevertheless, the number of cracks (flexural and shear) increased, and they were better distributed along the PFRC slabs. [192] Two key aspects in web-shear failure (see Figure 2-43a) in critical shear zones (ends of slabs) are the support width and cantilever span after the adopted support. As a wider support width and greater cantilever length allow the transmission length of strands to the concrete section to increase which can, in turn, increase shear strength, in real construction applications slabs are usually placed over the support's widths of 100-150 mm, which makes web-shear failure more critical.…”

Section: Shear In Frc Hcsmentioning

confidence: 99%

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Effectiveness of polypropylene fibres as shear reinforcement in structural elements

Navas¹,

Roberto²

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Several efforts have been made in experimental and theoretical research about shear to understand all the variables that influence the phenomenon. Nowadays, however, due to its complexity, the shear performance of structural concrete elements, especially those without any traditional transversal reinforcement, continue with no clear explanation of the problem. Uncertainty about the problem grows when new variables like fibres are incorporated into the shear study.Research works have demonstrated the effectiveness of steel fibre in improving the mechanical properties of concrete elements. Experimental results reveal that steel fibres have proven effective in improving shear resistance, and they confer some concrete elements more ductility. In adequate amounts, steel fibres can completely or partially substitute traditional shear reinforcements. This is why international codes have included some requirements to take into account the action of fibres on the shear response of concrete elements. However, most recommendations and requirements for steel fibre-reinforced concrete (SFRC) were originally created.New fibres with different materials properties and shapes, such as macrosynthetic fibres, are now available on the market. These fibres, some of which are made of polypropylene, are an alternative in the construction industry given their properties and final cost. Initially, polypropylene fibres were used to control shrinkage cracking. Nevertheless, in the last decade the chemical industry has created larger fibres with better surface shapes, which allows polypropylene fibres to meet the requirements of international codes so they can be used in structural elements.Per avaluar l'efectivitat de les fibres de polipropilè en el tallant, es realitzaran tres campanyes experimentals. Cada campanya representa un nivell d'estudi diferent. El primer és a nivell material on s'avalua el comportament a tallant a través d'espècimens tipus Push-off. El segon nivell, correspon a l'estudi del tallant en elements a escala real. Per això es fabriquen i assagen bigues esveltes crítiques a tallant. L'últim nivell correspon a una aplicació real de fibres de polipropilè actuant com a reforç a tallant. En aquesta campanya, es fabriquen i assagen plaques alveolars de gran cantell amb seccions i condicions de suports reals.

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Section: Shear In Frc Hcsmentioning

confidence: 71%

Section: Shear In Frc Hcsmentioning

confidence: 99%

Section: Shear In Frc Hcsmentioning

confidence: 99%

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