Experimental Investigation of High-Cycle Compressive Fatigue Performance of C80 High-Strength Concrete
Laiyuan Qin, Jia Fu, Mingyi Zhang, Ruiquan Zhou, Weifeng Tao, Zhiqiang Wan, Pengfei Wang
TL;DR
This study examines how high-strength concrete behaves under repeated compressive loads, important for structures like wind turbine towers.
Contribution
The paper introduces a new model for predicting fatigue life and stiffness degradation in C80 concrete under high-cycle loading.
Findings
Fatigue strain in C80 concrete evolves through three stages, with the second stage accounting for over 90% of fatigue life.
The final strain in the second stage closely matches static compression tests and improves fatigue life prediction.
A stiffness degradation model is developed to better simulate the behavior of C80 concrete under fatigue loads.
Abstract
With the height of wind turbine towers increasing, the high-cycle fatigue performance of high-strength concrete has become important for structural design. This study systematically investigates the fatigue life, strain evolution, and stiffness degradation of C80 concrete under constant-amplitude cyclic compressive loading for a maximum stress level ranging from 0.70 to 0.90 and a minimum stress level of 0.10. Based on experimental data, S–N curves are obtained, and a prediction model of fatigue life and stiffness degradation is developed. The results reveal that fatigue strain evolves through three stages and that the second stage accounts for more than 90% of the overall fatigue life, exhibiting linear growth over time. The final strain in the second stage is very close to that in static compression tests, indicating the uniqueness of fatigue strain. In addition, the final strain in…
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Taxonomy
TopicsFatigue and fracture mechanics · Mechanical Behavior of Composites · Structural Behavior of Reinforced Concrete