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为了定量地分析沥青混凝土路面内部动应变随荷载和环境作用的响应,研发了“工字梁”电阻式动态应变仪传感器。通过分析应变仪的工作原理,推导出线应变与轴向拉力的关系式,提出了动应变传感器标定方法。通过对预埋应变仪的梁试件进行三分点逐级加载试验,验证了动应变传感器协调变形特性。结果表明:应变仪圆柱体拉杆在轴向拉伸作用下,符合单轴应力状态下的胡克定律,轴向拉伸引起的变形与电压的变化成正比,应变仪传感器的标定系数为线应变变化量与输出电压变化值的比值;沥青混凝土中动应变传感器实测应变与理论计算应变基本相等,工字梁传感器与沥青混凝土具有同步协同变形的工作特性。
In order to quantitatively analyze the response of dynamic stress in asphalt concrete pavement to load and environment, a “I-beam” resistive dynamic strain gauge sensor was developed. By analyzing the working principle of strain gauge, the relationship between linear strain and axial tension is deduced, and the method of dynamic strain sensor calibration is put forward. Through the three-point step-by-step loading test of the embedded strain gauge beam specimen, the dynamic deformation sensor’s deformation characteristics were verified. The results show that the cylinder rod of the strain gauge under axial tensile action is in accordance with Hooke’s law under uniaxial stress. The deformation caused by axial tension is proportional to the change of voltage. The calibration coefficient of the strain gauge sensor is linear strain The ratio of change and output voltage change; the measured strain of asphalt concrete dynamic strain sensor is basically equal to the theoretical calculated strain, and the I-beam sensor and asphalt concrete have the working characteristics of simultaneous synergistic deformation.