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Structural Engineering and Mechanics Volume 89, Number 6, March25 2024 , pages 617-626 DOI: https://doi.org/10.12989/sem.2024.89.6.617 |
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Influence of loading rate on flexural performance and acoustic emission characteristics of Ultra High Performance Concrete |
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Prabhat Ranjan Prem, Vignesh Kumar Ramamurthy, Vaibhav Vinod Ingle, Darssni Ravichandran and Greeshma Giridhar
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| Abstract | ||
| The study investigated the behavior of plain and fibered Ultra-High Performance Concrete (UHPC) beams under varying loading conditions using integrated analysis of the flexure and acoustic emission tests. The loading rate of testing is -0.25 -2 mm/min. It is observed that on increasing loading rate, flexural strength increases, and toughness decreases. The acoustic emission testing revealed that higher loading rates accelerate crack propagation. Fiber effect and matrix cracking are identified as significant contributors to the release of acoustic emission energy, with fiber rupture/failure and matrix cracking showing rate-dependent behavior. Crack classification analysis indicated that the rise angle (RA) value decreased under quasistatic loading. The average frequency (AF) value increased with the loading rate, but this trend reversed under rate-dependent conditions. K-means analysis identified distinct clusters of crack types with unique frequency and duration characteristics at different loading rates. Furthermore, the historic index and signal strength decreased with increasing loading rate after peak capacity, while the severity index increased in the post-peak zone, indicating more severe damage. The sudden rise in the historic index and cumulative signal strength indicates the possibility of several occurrences, such as the emergence of a significant crack, shifts in cracking modes, abrupt failure, or notable fiber debonding/pull-out. Moreover, there is a distinct rise in the number of AE knees corresponding to the increase in loading rate. The crack mapping from acoustic emission testing aligned with observed failure patterns, validating its use in structural health monitoring. | ||
| Key Words | ||
| acoustic emission; flexure; loading rate; Ultra High-Performance Concrete | ||
| Address | ||
| Prabhat Ranjan Prem, Vignesh Kumar Ramamurthy, Vaibhav Vinod Ingle, Darssni Ravichandran and Greeshma Giridhar: CSIR-Structural Engineering Research Centre, Chennai 600 113, India | ||