RESEARCH ON SENSING CHARACTERISTICS OF CFRP PLATES COUPLED WITH LARGE-RANGE FIBER GRATINGS
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摘要: 传统的加固维修方式很难以获知加固过程中桥梁全生命周期的监测情况以及加固效果,为此提出了一种在碳纤维(CFRP)板耦合大量程光纤光栅(FBG)传感器以制成自感知CFRP板的方法。为了验证耦合光纤光栅的CFRP板的应力、应变测量精度,基于国家标准静态性能指标相关计算准则,开展自感知CFRP板中光纤光栅传感性能指标的标定和张拉试验,并对传感特性理论及试验应变灵敏度的误差进行了分析。试验结果表明:自感知CFRP板中的光纤光栅具备良好的感知性能,其应变测量范围达到了1.2×10-2以上,试验应变灵敏度不小于1.18 pm/10-6,迟滞不大于1.52%,线性度不大于3.35%,重复性不大于2.29%,总精度不小于3.92%,可以达到实际工程需求。Abstract: Traditional reinforcement maintenance methods are difficult to obtain the full-life cycle monitoring status of the bridge during the reinforcement process as well as the reinforcement effect. Therefore, a method for coupling a CFRP board with a pre-compressed long-range fiber bragg grating (FBG) sensor to make a self-sensing CFRP board was proposed. In order to test the stress and strain measurement accuracy of the fiber grating self-sensing CFRP board, based on the relevant calculation principle of national standard static performance index, the calibration and tension test of light grating sensing performance index in self-sensing CFRP plate were carried out, and the error of sensing characteristic theory and test strain sensitivity were analyzed. The test results showed that the fiber grating in self-sensing CFRP had good sensing performance, its strain reached more than 1.2×10-2, the test strain sensitivity was not less than 1.18 pm/10-6, the hysteresis was not more than 1.52%, the linearity was not more than 3.35%, and the repeatability was not more than 2.29%. The total accuracy was not more than 3.92%, which could meet the actual engineering requirements.
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Key words:
- self-sensing cerp plate /
- FBG sensor /
- calibration test /
- sensing performance
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