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通过对一座钢管混凝土桁拱肋截面布置温度测点并在现场布置小型气象站,进行了拱肋截面温度场的测试及气象资料的采集,对各弦管的温度分布进行了分析,并应用有限元法分析了各弦管的平均温度以及由此引起的温度应力。结果表明:桁拱各弦管的温度分布中,在与太阳升落方向平行的系列上,上、下弦管温度分布相近;在与太阳升落方向垂直的系列上,左、右弦管的温度分布接近;桁拱各弦管的温度分布及平均温度与单圆管接近,实际分析中可按单圆管来考虑;桁拱各弦管之间的平均温度相差较小,由其引起的温度应力也较小,弦管与腹管的温差对弦管和腹管的应力影响均较小,实际计算中可不考虑。
The temperature field of the arch rib section and the collection of meteorological data were obtained by arranging the temperature measuring points on the cross-section of a steel-pipe concrete truss arch rib and arranging the small-scale weather station in the field. The temperature distribution of the chord-tube was analyzed and the application was limited The element method analyzes the average temperature of each chord and the resulting temperature stress. The results show that the temperature distributions of the pipe strings of the truss arch are similar to that of the upper and lower chordal tubes in the series parallel to the rising and falling of the sun. In the series perpendicular to the rising and falling of the sun, the temperature of the left and right chords The temperature distribution and the average temperature of each chord tube of the truss arch are close to those of the single tube. In the actual analysis, the temperature can be considered as a single tube. The difference between the average temperatures of each chord of the truss arch is small, and the temperature The stress is also small, the temperature difference between the chord and the abdomen tube has less effect on the stress of the chord tube and the abdomen tube, and can not be considered in the actual calculation.