日照作用下箱梁桥上无缝线路纵向力

论述基于ANSYS的混凝土箱型梁桥日照温度场分析方法,应用实测数据对计算结果进行验证.采用带有组合截面信息的空间梁单元模拟箱型连续梁桥,计算其在日照作用下的温度效应,采用非线性弹簧模拟无缝线路（CWR）纵向阻力,以6×32 m箱型截面预应力混凝土连续梁桥为算例,分析日照作用下钢轨纵向力的分布规律,对相关参数的影响进行探讨.分析表明：日照作用下钢轨应力在正午时取得最大值,午夜时取得最小值,而按照现行规范中整体升温20 ℃计算的钢轨伸缩力是日照作用下钢轨应力的1.3倍,增加底座板厚度将有利于改善钢轨受力.在日照作用下,钢轨应力与大气透明度系数成正比,铺装层采用浅色涂层并保持光滑度将有利于减小钢轨应力.

Longitudinal force of CWR on box girder under solar radiation

The calculation method of solar radiation temperature field on concrete box girder based on the ANSYS was discussed, and the calculation results were verified with the measured data. In order to calculate the temperature effect under the solar radiation, the space beam element with section information was used to simulate the continuous box beam bridge, and the nonlinear spring was used to simulate the longitudinal resistance of continuously welded rail (CWR). Taking the 6×32 m box section and prestressed concrete continuous beam as a case, the distribution law of rail longitudinal force was analyzed under the solar radiation. The impact of relevant design parameters was considered. The analysis results show that the maximum value of rail stress is got at high noon under the solar radiation and the minimum value by midnight. In accordance with the existing norms, the rail expansion force at the time of the whole beam increasing-temperature 20 ℃ is 1.3 times as much as the rail force under the solar radiation. Increasing the slab thickness is conducive to the rail force. The rail stress is proportional to the atmospheric transparency coefficient under the solar radiation, and using light-colored coating and maintaining smoothness for the bridge deck will help to reduce the rail force.