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在实测混凝土总应变中消除自由温度应变时,温度取值对最终应力计算成果影响很大。分别采用应变计温度、无应力计温度、应变计组平均温度计算实测应力,结合中误差和极限误差理论,推导了三种温度取值方法的计算精度。研究结果表明,温度误差使应力应变计算精度至少降低了一倍;考虑温度误差影响下,采用应变计温度和应变计组平均温度计算精度相当,采用无应力计温度计算精度最低。结合某混凝土拱坝实测应力计算实例,得出了应变计组和无应力计所处位置混凝土温度差异是造成实测应力精度降低的重要原因,并建议根据温度测值实际情况,使用应变计自身温度或应变计组平均温度计算实测应力。
In the measurement of total concrete strain to eliminate free-temperature strain, the temperature value of the final stress calculation results. The calculation precision of the three kinds of temperature methods is deduced by using the strain gauge temperature, stress free gauge temperature and strain gauge group average temperature respectively to calculate the measured stress, combining the theory of medium error and limit error. The results show that temperature error can reduce the calculation precision of stress and strain at least. Considering the effect of temperature error, the calculation accuracy of average temperature with strain gauge temperature and strain gauge is equivalent, and the accuracy of temperature calculation with stress-less meter is the lowest. According to the calculation example of the measured stress of a concrete arch dam, it is concluded that the temperature difference of the concrete between the strain gauge group and the stress-free meter is the important reason for decreasing the measured stress precision. It is suggested that the temperature of the strain gauge should be adjusted according to the actual temperature Or strain gauge group average temperature calculation of measured stress.