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Absorption of energy in fatigue loading of plain concrete

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Abstract

Existing partial damage hypothesis gives unsatisfactory results in estimating the fatigue of plain concrete. Volumetric, ultrasonic, and acoustic emission measurements have not been able to fully interpret the deterioration of concrete. Another parameter in this respect might be the absorbed energy by the loaded concrete. In this investigation a measuring system for registration of the absorbed energy is presented. The results achieved are affected by difficulties at the development of the measuring system. However, it seems as if the absorbed energy at failure of concrete was the same for static load and for fatigue load with different intensities.

Résumé

Les hypothèses de dommages partiels dont on dispose ne donnent pas de résultats satisfaisants pour estimer la fatigue du béton non armé. Les mesures volumétriques ultrasoniques et d'émission acoustique ne suffisent pas pour interpréter complètement la détérioration du béton. Un autre paramètre pourrait être ici l'énergie absorbée par le béton sous charge. Dans cette étude, on présente un système de mesure pour enregistrer l'énergie absorbée. Les résultats obtenus sont affectés par les différences de mise au point du système de mesure. Il semble cependant que l'énergie absorbée à la rupture du béton est la même sous charge statique et en fatigue avec des intensités différences.

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Abbreviations

W :

load

W :

energy (kN. m)

N :

number of loading cycles

N c :

calculated number of loading cycles at fatigue failure

N m :

measured number of loading cycles at fatigue failure

R :

σ minccc maxccc

f cc′:

compressive concrete strength of Swedish standard cubes

f ccc :

compressive concrete static strength of cylinder specimen

l :

strain measuring base

σ:

stress

σ mmaxccc :

upper limit of pulsating compressive stress

σ minccc :

lower limit of pulsating compressive stress

ε:

strain

ε// :

strain in direction of the load

ε :

strain transverse to the load

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Tepfers, R., Hedberg, B. & Szczekocki, G. Absorption of energy in fatigue loading of plain concrete. Mat. Constr. 17, 59–64 (1984). https://doi.org/10.1007/BF02474058

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