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以经实桥实测温度场验证的有限元方法,对一座钢管混凝土桁拱的计算合龙温度、有效温度取值进行了分析。分析表明,大气平均温度对钢管混凝土桁拱的计算合龙温度的影响最大,该拱肋的计算合龙温度大致为混凝土浇注后28 d内平均气温加3～5℃,冬季合龙取小值,夏季合龙取大值;日照作用对最低有效温度的影响不大,而对最高有效温度的影响很大,最高有效温度接近当地全年最高温度,最低有效温度接近当地最低日平均温度,弦管管径、钢管表面的辐射吸收率的影响都较为明显,而拱平面方位的变化和风速的影响不大。通过大量的参数分析,给出了福建省钢管混凝土桁拱的计算合龙温度和最高、最低有效温度的取值建议。
Based on the finite element method verified by the measured temperature field in the real bridge, the calculation of the closing temperature and the effective temperature of a CFST truss arch were analyzed. The analysis shows that the influence of atmospheric mean temperature on the calculation of the temperature of concrete filled steel tubular truss arch has the greatest effect. The calculated temperature of the arch rib is about 3-5 ℃ after 28 days of concrete pouring, The maximum effective temperature is close to the local maximum temperature, the minimum effective temperature is close to the local minimum daily average temperature, the pipe diameter, The influence of radiation absorption rate on the surface of steel pipe is obvious, while the change of azimuth of arch plane and wind speed have little effect. Through a large number of parameter analysis, the calculation suggestion of calculating the closing temperature and the maximum and minimum effective temperature of CFST truss arch in Fujian Province is given.