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为了明确大跨连续刚构桥上梁体及轨道温度分布及其对桥上无缝线路力学行为的影响,以1座铁路常用双线特大连续刚构桥为例,针对箱梁及轨道结构的温度分布开展测试研究,分析结果表明:根据实测数据,钢轨温度最高值要高于气温,轨温最低值相对气温也较低。当气温较低时,最低轨温与最低气温虽不完全一致,但两者相差很小,最高轨温与最高气温亦是如此,但当气温较高时,最高轨温要明显高于最高气温;桥梁纵向温度分布差别不大,温差主要表现在竖向和横向上,箱梁温度沿梁高方向自上而下逐渐升高,沿箱梁横向上同样存在差别,但相差均较小;梁体垂向温度梯度对钢轨纵向受力影响较小,但其对线路高低不平顺会有一定影响,且主要是在长波范围内,当温度梯度较大时会出现长波不平顺超限。
In order to clarify the temperature distribution of beam body and track on a long-span continuous rigid frame bridge and its effect on the mechanical behavior of the continuous track on a bridge, a two-track super large continuous rigid frame bridge commonly used in a railway is taken as an example. The results show that: according to the measured data, the highest temperature of the rail is higher than the temperature, and the lowest temperature of the rail is relatively low. When the temperature is low, the minimum temperature and the minimum temperature are not exactly the same, but the difference between the two is very small, as is the maximum temperature and the maximum temperature. However, when the temperature is higher, the maximum temperature is obviously higher than the maximum temperature ; The longitudinal distribution of the bridge temperature is not very different, the temperature difference mainly in the vertical and horizontal, the box girder temperature along the beam height direction from top to bottom gradually increased along the box girder transverse same difference, but the difference is small; beam Body vertical temperature gradient has little effect on rail longitudinal stress, but it will have an impact on the line height irregularity, and mainly in the long-wave range, when the temperature gradient is large, there will be long-wave irregularity overrun.