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本文讨论了混凝土箱梁的不稳定温度场差分数值分析,提出了参数处理方法,完成了实际边界条件转换。导出了二维温度荷载下的温度应力计算公式。按本文计算方法编制了电算程序,电算结果包括温度场、温度应力和温度位移。计算结果与实测数据符合较好,证明了本文的计算方法合理、可信。本文明确了箱梁日照最不利温度荷载的发生时刻与相应最大温度应力的数值以及高应力区发生部位。提出了减小箱梁温度应力危害的几点建议。
In this paper, the differential numerical analysis of the unstable temperature field of concrete box girder is discussed. The parameter processing method is put forward and the actual boundary condition transformation is completed. The temperature stress calculation formula under two-dimensional temperature load is deduced. According to the calculation method of this article, a computer program is compiled. The calculation results include temperature field, temperature stress and temperature displacement. The calculated results are in good agreement with the measured data, which proves that the calculation method in this paper is reasonable and credible. In this paper, the value of the moment of the most unfavorable temperature load and the corresponding maximum temperature stress of the sunshine of box girder and the site of occurrence of the high stress zone are defined. Some suggestions to reduce the temperature stress of box girder are put forward.