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

¹ Institute for Infrastructure and Environment, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
² School of Civil and Environmental Engineering, Addis Ababa University-Addis Ababa Institute of Technology, Addis Ababa, 1000, Ethiopia
³ Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan
⁴ Department of Civil and Environmental Engineering, Hosei University, Tokyo 162-0843, Japan
⁵ School of Civil Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom

^* Corresponding author: b.suryanto@hw.ac.uk

Abstract

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.