| 摘要(英) |
The main purpose of this study is to investigate the fatigue behavior of SD420W deformed reinforcement and SD690 thread deformed reinforcement, and to verify the fatigue cumulative damage theorem, by means of the fatigue test testing on the reinforced concrete beams.
The test is based on the repeated load test method, under the action of different stress differences (fr), corresponding fatigue life, and the measurement at the beam midpoint deflection and concrete strain. The testing will be performed to the normal strength and high strength reinforced concrete beams to mainly explore the fatigue behavior of SD420W and SD690 steel bars.
The fatigue cumulative damage test is also carried out through the S-N curve to plan several stress difference amplitudes (fr). It was then given few limited cycle numbers(Ni) to evaluate the fatigue damage value(D), being defined as the ratio of the cycle(Ni) to the corresponding(Nfi). According to Miner’s linear cumulative damage theory when the fatigue cumulative damage value D=1, the tested beam will be destroyed. By such a experimental study, a proper fatigue cumulative damage theorem can be verified.
According to the previous high-strength reinforced concrete beam fatigue test 〔13、14〕 and the results obtained from this research, the S-N curves of SD420W deformed reinforcement and SD690 thread deformed reinforcement are similar to the empirical formula proposed by Helgason. The fatigue fractural area is also measured to SD420W deformed steel bar and the SD690 thread deformed steel bar after fatigue fracture occurred, the fatigue crack area of the two types of bars is about 80% for SD420W bars, and about 6% for SD690 bars. The fracture surface of the SD690 bar is very flat in comparison with the SD420W bar.
The result of the fatigue cumulative damage test showed the fatigue cumulative damage values did not match the Miner rule, which is linearly cumulated damage value to the theoretical D=1. However, the fatigue cumulative damage values obtained according to the Minin′s rule modified by Hashin were pleasantly consistent with the experimental results.
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| 參考文獻 |
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