y - JOUR A2 -姚池李，欢欢李，李少军，胡刚，国飞PY - 2021 DA - 2021/06/30 TI - FEA of日温变化对小湾拱坝下游表面的影响SP - 6300387 VL - 2021 AB -为明确小湾水电站拱坝运行期开裂原因，采用ANSYS与COCE-3D有限元程序相结合的方法。首先，分析了单元类型和网格尺寸对温度场模拟结果的影响。随后，选取了小湾拱坝切割的三个典型坝段，建立了相应的有限元模型;深入分析了实测气温对拱坝温度场和温度应力的影响。结果表明:当网格尺寸过大时，大体积混凝土的温度梯度变小，而温度梯度的影响深度增大;因此，宜采用较小尺寸的网格来研究测量的日空气温度对大体积混凝土表面温度分布的影响。拱坝下游区域温度受气温影响显著;温度场和温度应力随气温的变化规律基本一致，对低温比较敏感。 When the temperature sharply decreased, the temperature stress in the downstream zone is mainly in tensile stress state. The calculated results are basically consistent with the measured results, and the temperature stress induced by the day-night temperature difference is the important reason for the horizontal cracks on the downstream surface. The submodel analysis method is an important alternative approach to study the changing laws of temperature field of arch dam. The research results not only provide an evidence for temperature control and crack prevention of Xiaowan arch dam but also provide a reference for temperature field simulation of similar projects. SN - 1687-8086 UR - https://doi.org/10.1155/2021/6300387 DO - 10.1155/2021/6300387 JF - Advances in Civil Engineering PB - Hindawi KW - ER -