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在悬臂施工阶段,一般结构应力监控分析多考虑混凝土的收缩徐变效应,而不考虑温度效应,虽然不能避开温度的位移效应影响,但还是可以通过选择测量时间,减小温度的应力效应影响。然而,在施工现场对振弦式传感器的长期实测过程中,通过比较实测数据与理论数据反映出部分监控测点处实测微应变值经常发生显示读数不稳定、有跳变甚至长期变化无明显规律的情况。通过结合工程实例,依据MIDAS/Civil有限元程序模拟计算与结构状态现场实测对比结果,对应力监控数据采集过程中出现的实际问题进行定性地分析修正,为悬臂施工预应力混凝土桥梁结构应力监测控制过程提供参考。
In the cantilever construction stage, the general structural stress monitoring and analysis should consider the shrinkage and creep effect of concrete without regard to the temperature effect. Although it can not avoid the influence of the temperature displacement effect, it can still be affected by the selection of the measurement time and the decrease of the temperature stress effect . However, during the long-term actual measurement of the vibrating wire sensor at the construction site, it is noticed that the measured microstrain values at some monitoring points often show unstable readings and no obvious regularity of jumping or even long-term changes by comparing the measured data with the theoretical data Case. By combining engineering examples and field test results of simulation and calculation based on MIDAS / Civil finite element program, the actual problems in the course of stress monitoring data acquisition are qualitatively analyzed and corrected, which can be used for the stress monitoring and control of prestressed concrete bridge structures with cantilever construction Process for reference.