以湖南省张花高速公路酉水大桥(80+ 145 +80)m大跨度悬臂浇筑预应力混凝土连续箱梁桥为工程背景,介绍斜交高墩日照温度效应的影响因素及有限元分析方法.运用ANSYS有限元分析软件,建立酉水大桥斜交高墩热效应分析模型,以现场实验数据为依据,分析桥墩在日照温度场作用下结构的温度场、温度应力分布特征；在得出桥墩温度应力分析方法的基础上,对桥墩施加结构荷载及边界条件,计算桥墩综合因素作用下的受力特征,并研究温度效应对桥墩受力的影响程度.最后计算温度效应对桥墩支座反力的影响,给出因支座反力变化对上部结构产生的扭矩.%On the background of Youshui Bridge,the influencing factors of high skew pier sunlight temperature effect and finite element analysis method were introduced in a (80 + 145 + 80)m casting prestressed concrete box girder continuous bridge of high skew pier large span cantilever of Zhanghua highway in Hunan province,where the thermal effect analysis model was built by use of the finite element analysis software ANSYS.Based on the spot test data,the structure temperature field and temperature stress distribution characteristic of the bridge pier under the action of sunshine were analyzed.After exerting structure load and boundary conditions,structural mechanic characteristics of the pier under integrated factors were also investigated based on the analysis method of temperature effect,and temperature influence degree on the stress of bridge pier was discussed.At last,the influence of support reaction under temperature effect was explored,and the torque of bridge upper structure was provided after the support reaction was changed.
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