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Studies on fracture behaviour of lightly reinforced concrete beams using digital image correlation
, H. E. Nagesh
Published in Structural Engineering Research Centre
2017
Volume: 44
   
Issue: 4
Pages: 275 - 286
Abstract
Lightly reinforced concrete (RC) beams are fracture sensitive, which can be analysed with accuracy using fracture mechanics principles. This paper describes fracture behaviour of lightly reinforced concrete beams using digital image correlation (DIC) and also discusses short comings related to prediction of minimum tension reinforcement, as per IS 456-2000, in beams made of high strength concrete. The images acquired using two dimensional (2D)-DIC technique are correlated with undeformed image for capturing full field displacements, horizontal strain, crack width and crack length. The crack mouth opening displacement (CMOD) and mid-span deflection recorded using DIC have been compared with those measured from linear variable differential transducer (LVDT), are found to be in good agreement. Overall, DIC technique has been observed to be effective for predicting the fracture parameters of lightly RC beams. An experimental study has been carried out to understand the influence of beam size and compressive strength of concrete on behaviour of lightly RC beams. It has been found that tensile cracking stress in concrete decreases with increase in beam depth. The minimum tension reinforcement as per IS 456-2000 cannot ensure stable behaviour and hence unsafe for high strength concrete beams. Thus, the provision for minimum reinforcement needs modification incorporating compressive strength of concrete and beam size.
About the journal
JournalJournal of Structural Engineering (India)
PublisherStructural Engineering Research Centre
ISSN09700137
Open AccessNo
Concepts (19)
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    Compressive strength
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    Concrete beams and girders
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    Cracks
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    Fracture
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    FRACTURE MECHANICS
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    HIGH PERFORMANCE CONCRETE
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    Image analysis
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    Reinforced concrete
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    Strain measurement
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    Tensile strength
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    COMPRESSIVE STRENGTH OF CONCRETE
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    Crack mouth opening displacement
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    D. DIGITAL IMAGE CORRELATION (DIC)
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    DIGITAL IMAGE CORRELATIONS
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    LIGHTLY REINFORCED
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    LIGHTLY REINFORCED CONCRETE BEAMS
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    LINEAR VARIABLE DIFFERENTIAL TRANSDUCERS
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    Size effects
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    Concretes