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阐述了钢筋混凝土支撑温度内应力作用机理,以一处于压弯荷载作用下的钢筋混凝土支撑为试验对象,利用自动化监测技术采集其在加载过程中的轴力和温度变化数据。基于试验数据,简单验证了弯曲荷载的作用效应,考察了不同截面位置对温度内应力的影响,初步确定了温度内应力的修正方法。结果表明:实测值与理论值吻合得较好,说明试验方法的可靠性与试验数据的准确性;温差大的截面位置会产生较大的温度内应力,截面上部温度内应力最大、下部次之、中部最小;采用线性方法对支撑轴力进行修正能取得一定的效果。
The mechanism of temperature internal stress of reinforced concrete support was expounded. A reinforced concrete support under bending load was used as test object, and the data of axial force and temperature during loading process were collected by automatic monitoring technology. Based on the experimental data, the effect of bending load is simply verified. The influence of different cross-section locations on the temperature internal stress is investigated, and the correction method of temperature internal stress is preliminarily determined. The results show that the measured value is in good agreement with the theoretical value, which shows the reliability of the test method and the accuracy of the test data. The large cross-sectional temperature will produce large temperature stress, the maximum internal stress of the cross-section temperature, , The middle of the smallest; using linear methods to support axial force correction can achieve some results.