Abstract
MTS-810 material testing machine and acoustic emission signal analyzer were adopted to explore the mechanical behavior of concrete beams broken by the static load and the nonlinear cumulative damage law of concrete beams broken by fatigue bending from single-stage loading. Then, by introducing the Ramesh Talreja’s Damage Criterion, the damage rule of single-stage loading was extended to the damage accumulation rule under multi-stage loading, and the results were verified by the results of two-stage and three-stage fatigue loading tests. Two main conclusions are achieved: first, affected by four-point bending load, the fatigue life of the concrete specimen is in line with the law of the two-parameter Weibull distribution, namely the higher the stress level is, the shorter the fatigue life is. Second, an obvious nonlinear relationship was discovered in the damage of concrete. The model deduced in this paper and the Palmgren-Miner linear damage accumulation model were adopted to compare the test results of flexural fatigue under single, two and three stage loads. The calculation results of this model were more reliable.
Highlights
The airport pavement is subjected to multi-level cyclic loads because the load characteristic of the new aircraft on the pavement are different in each stage of take-off and landing
The existing beam flexural fatigue equations often assume that the applied load is a constant amplitude repeated load, which often ignores the multi levels of time history
As the 400 mm × 100 mm × 100 mm non-standard concrete beam is adopted, it needs to be converted through the dimension coefficient (0.85), and the result data are listed in the Table 6
Summary
The airport pavement is subjected to multi-level cyclic loads because the load characteristic of the new aircraft on the pavement are different in each stage of take-off and landing. A new fatigue damage model for pavement concrete beams and a large number of experiments [5], Miner proposed the linear cumulative damage theory. Based on the cubic polynomial cumulative damage model, proposed by B.H.Oh, the nonlinear cumulative damage characteristics of concrete bearing bending action are further verified by theoretical and experimental calculation [9,10,11]. As for the damage accumulation method, the existing test rules and theoretical results are mainly based on the uniaxial tensile test and compression test of concrete, while the damage accumulation rule for the bending fatigue test of concrete beams still needs to be explored. Based on the understanding of the influencing factors of fatigue performance, the paper conducted an experimental research and analysis on the fatigue damage of concrete beams bearing bending, which would contribute to the theoretical and experimental references for the further studies
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