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为了确定混凝土箱梁内部最不利正、负温度梯度分布形式,对处于成桥阶段的某大跨径混凝土连续箱梁桥进行了为期13个月的持续温度观测。在现场采集温度数据的基础上,采用概率统计分析后运用广义极值分布的方法计算沿箱梁高度方向和沿腹板宽度方向最不利正温度梯度及顶板、腹板和底板厚度方向最不利负温度梯度,并建立结构整体模型和温度控制截面模型进行不同温度梯度形式下温度效应研究。结果表明:计算得出的实测最不利温度梯度与规范规定的温度梯度不同,为观测桥梁所在地区分析混凝土箱梁温度效应影响提供指导。
In order to determine the distribution pattern of the most unfavorable positive and negative temperature gradient inside the concrete box girder, a continuous 13-month temperature observation was carried out on a long-span concrete continuous box girder bridge in the bridging stage. Based on the collected temperature data in the field, the most unfavorable positive temperature gradient along the height direction of the box girder and the most unfavorable positive temperature gradient along the width direction of the web and the most unfavorable negative direction of the thickness of the roof, web and floor are calculated using the method of generalized extreme value distribution after probability and statistics analysis Temperature gradient, and the overall structure of the model and the temperature control section model to establish different temperature gradient form of temperature effects. The results show that the calculated most unfavorable temperature gradient is different from the temperature gradient specified in the code, providing guidance for the analysis of the effect of temperature on concrete box girder in the area where the bridge is located.