| 混凝土工字梁三点弯曲荷载超声测试 |
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| 引用本文： | 郭增伟,田川,计亲,郑罡.混凝土工字梁三点弯曲荷载超声测试[J].重庆大学学报(自然科学版),2019,42(11):88-97. |
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| 作者姓名： | 郭增伟 田川 计亲 郑罡 |
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| 作者单位： | 重庆交通大学 省部共建山区桥梁与隧道工程国家重点实验室 ,重庆,400074;重庆交通大学 省部共建山区桥梁与隧道工程国家重点实验室 ,重庆,400074;重庆交通大学 省部共建山区桥梁与隧道工程国家重点实验室 ,重庆,400074;重庆交通大学 省部共建山区桥梁与隧道工程国家重点实验室 ,重庆,400074 |
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| 基金项目： | 国家自然科学基金资助项目（51878106，51478072）。 |
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| 摘 要： | 制定并实施了钢筋混凝土工字梁三点弯曲荷载超声测试方案,采集了21个荷载等级下超声波波形,利用泰勒展开式,去除了高阶信号的影响,提取波形幅值变化多阶含量,建立了幅值一阶变化系数与应力变化近似线性曲线。研究表明:钢筋混凝土工字梁超声波幅值一阶变化系数与应力变化拟合曲线拟合优度高于0.99。
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| 关 键 词： | 超声波 应力测试 泰勒展开 混凝土 |
| 收稿时间： | 2018/7/15 0:00:00 |
Three-point bending load ultrasonic test of concrete I-beam |
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| GUO Zengwei,TIAN Chuan,JI Qin and ZHENG Gang.Three-point bending load ultrasonic test of concrete I-beam[J].Journal of Chongqing University(Natural Science Edition),2019,42(11):88-97. |
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| Authors: | GUO Zengwei TIAN Chuan JI Qin and ZHENG Gang |
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| Institution: | State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, P. R. China,State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, P. R. China,State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, P. R. China and State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, P. R. China |
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| Abstract: | An ultrasonic waves test scheme for three-point bending load of reinforced concrete I-beam was developed and implemented. Ultrasonic waves data were collected under 21 load levels, Taylor expansion was applied to eliminate the influence of high order signal and extract the multiorder content of amplitude change of wave, and an approximate linear curve between amplitude first-order change coefficient and stress change was established. The research shows that under the condition of three-point bending stress, the first-order change coefficient of the wave amplitude of reinforced concrete I-beam can be fitted linearly with its stress change, and the goodness of fit is higher than 0.99. |
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| Keywords: | ultrasonic stress test Taylor expansion concrete |
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