Structural Engineering and Mechanics

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Modulus degradation of concrete exposed to compressive fatigue loading: Insights from lab testing

  • Song, Zhengyang (Department of Civil Engineering, School of Civil & Resource Engineering, University of Science & Technology Beijing) ;
  • Konietzky, Heinz (Geotechnical Institute, TU Bergakademie Freiberg) ;
  • Cai, Xin (School of Resources and Safety Engineering, Central South University)
  • Received : 2020.11.08
  • Accepted : 2021.02.25
  • Published : 2021.05.10
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Abstract

This article analyzed the modulus degradation of concrete subjected to multi-level compressive cyclic loading. The evolution of secant elastic modulus is investigated based on measurements from top loading platen and LVDT in the middle part of concrete. The difference value of the two secant elastic moduli is reduced when close to failure and could be used as a fatigue failure precursor. The fatigue hardening is observed for concrete during cyclic loading. When the maximum stress is smaller the fatigue hardening is more obvious. The slight increase of maximum stress will lead to the "periodic hardening". The tangent elastic modulus shows a specific "bowknot" shape during cyclic loading, which can characterize the hysteresis of stress-strain and is influenced by the cyclic loading stresses. The deterioration of secant elastic modulus acts a similar role with respect to the P-wave speed during cyclic loading, can both characterize the degradation of the concrete properties.

Keywords

Acknowledgement

The authors would like to express the sincere gratitude to the help during the laboratory testing from Mr. Munzberger, Mr. Weichmann and Ms. Tauch in the rock mechanics laboratory of geotechnical institute of TU Bergakademie Freiberg, Germany. This article is funded by the Fundamental Research Funds for the Central Universities and Funds from State Key Laboratory of Coal Resources in Western China (SKLCRKF20-07).

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