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Fatigue Crack Growth Study and Remaining Life Assessment of High Strength and Ultra High Strength Concrete Beams

A. Ramachandra Murthy1, Nagesh R. Iyer1, B.K. Raghu Prasad2
CSIR-Structural Engineering Research Centre, Taramani, Chennai, India, 600113, [murthyarc,nriyer] @serc.res.in
Civil Engineering Dept., Indian Institute of Science, Bangalore, bkr@civil.iisc.ernet.in

Computer Modeling in Engineering & Sciences 2012, 89(6), 459-480. https://doi.org/10.3970/cmes.2012.089.459

Abstract

This paper presents the details of crack growth study and remaining life assessment of concrete specimens made up of high strength concrete (HSC, HSC1) and ultra high strength concrete (UHSC). Flexural fatigue tests have been conducted on HSC, HSC1 and UHSC beams under constant amplitude loading with a stress ratio of 0.2. It is observed from the studies that (i) the failure patterns of HSC1 and UHSC beams indicate their ductility as the member was intact till the crack propagated up to 90% of the beam depth and (ii) the remaining life decreases with increase of notch depth (iii) the failure of the specimen is influenced by the frequency of loading. A "Net K" model has been proposed by using non-linear fracture mechanics principles for crack growth analysis and remaining life prediction. SIF (K) has been computed by using the principle of superposition. SIF due to the cohesive forces applied on the effective crack face inside the process zone has been obtained through Green's function approach by applying bi-linear tension softening relationship to consider the cohesive the stresses acting ahead of the crack tip. Remaining life values have been have been predicted and compared with the corresponding experimental values and observed that they are in good agreement with each other.

Keywords

Ultra high strength concrete, characterization, fatigue loading, Tension softening, Stress intensity factor, crack growth, remaining life

Cite This Article

Murthy, A. R., Iyer, N. R., Prasad, B. R. (2012). Fatigue Crack Growth Study and Remaining Life Assessment of High Strength and Ultra High Strength Concrete Beams. CMES-Computer Modeling in Engineering & Sciences, 89(6), 459–480.



This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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