Investigating the Mechanism of Shear Fatigue in Reinforced Concrete Beams subjected to Pulsating and Moving Loads using Digital Image Correlation

An experimental investigation on three shear-critical reinforced concrete beams was performed to investigate the mechanism of shear fatigue. The first beam was simply tested to failure under monotonic loading to determine the static capacity, whereas the other two were subjected to repetitive loadin...

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Bibliographic Details
Published in:MATEC web of conferences 2019, Vol.258, p.3015
Main Authors: Suryanto, Benny, Staniforth, George, Kim, Jaehwan, Gebreyouhannes, Esayas, Chijiwa, Nobuhiro, Fujiyama, Chikako, Woodward, Peter K.
Format: Article
Language:English
Subjects:
Crack propagation
Digital imaging
Digital mapping
Fatigue life
Fatigue tests
Flexing
Fracture mechanics
Load
Moving loads
Reinforced concrete
Repeated loading
Shear stress
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Summary:An experimental investigation on three shear-critical reinforced concrete beams was performed to investigate the mechanism of shear fatigue. The first beam was simply tested to failure under monotonic loading to determine the static capacity, whereas the other two were subjected to repetitive loading below its static capacity to failure. Of these two beams, one was subjected to a stationary pulsating load at midspan while the other was subjected to a step-wise moving load along the span. During each experiment, the crack pattern was monitored throughout using an automated crack mapping employing the digital image correlation technique. The results show that each beam exhibited a unique crack pattern which could be characterised as shear-flexure in nature. It is shown the nature of crack propagation under monotonic loading is dissimilar to that under repetitive loading, especially when the load is not stationary. Moving load is also shown to cause greater damage to the beam than the stationary pulsating load and result in a reduction in fatigue life by almost two orders of magnitude.
ISSN:2261-236X
2274-7214
2261-236X
DOI:10.1051/matecconf/201925803015