基于统计分析的混凝土箱梁温差标准值研究

为了确定混凝土箱梁内部最不利正温差和反温差的大小,对处于施工阶段的某混凝土连续箱梁桥进行了为期1年的温度效应观测.在实际温度观测数据的基础上,采用统计分析中假设检验和参教分析的方法对混凝土箱梁温差标准值进行了分析,进而计算出混凝土箱梁正温差和反温差相应的标准值.结果表明,混凝土箱梁正温差和反温差服从不同的Weibull概率分布;混凝土箱梁正温差标准值为24.8℃,反温差标准值为-10.9℃.

Study of Characteristic Value of Thermal Difference of Concrete Box Girder Based on Statistical Analysis

In order to determine the most unfavorable positive and negative values of temperature difference in concrete box girder, a one-year observation on temperature effect of a PC continuous box girder bridge during construction was conducted.Based on the measurement data, the hypothesis testing and parameter analysis were used in the statistical analysis of characteristic values of daily temperature difference in the concrete box girder, and the characteristic values of positive and negative temperature difference for the analyzed concrete box girder were then calculated.The result indicates that (1) the daily positive and negative temperature differences of the concrete box girder follow different Weibull distributions; (2) the characteristic values of positive and negative temperature difference are 24.8 ℃ and - 10.9℃respectively.