摘要
平南三桥为主拱拱肋采用钢管混凝土结构的中承式拱桥,主跨575 m为目前世界第一拱。以该特大拱桥为案例,研究钢管混凝土拱肋的日照温度效应,依据温度实测数据,通过数值模拟计算,对拱肋截面的温度场及温度应力进行分析,探讨温度场变化对拱桥结构受力特征的影响规律。结果表明:晴朗天气时拱肋更容易出现最不利温度场分布;基于拱肋截面实测日照温度数据,采用ANSYS有限元方法进行钢管混凝土拱肋温度效应分析是可行的;在当日最不利日照温差工况下,钢管混凝土拱肋截面整体呈受压趋势,最大压应力值9.73 MPa,拱肋的日照温度效应不容忽视。研究结论可为同类型拱肋结构施工及设计提供参考。
The main arch rib of the Pingnan third bridge is a half through arch bridge of concrete filled steel tube structure,with a main span of 575 m,which is the first arch bridge in the world.In this paper,taking Pingnan third bridge as a study object,the sunshine temperature effect of the concrete-filled steel tube arch rib was studied.The temperature field and related stress of the arch rib section was analyzed by numerical simulation based on the measured temperature data.The influence law of temperature field on mechanical characteristics of arch bridge structure was discussed.The results show that:in sunny weather,the arch rib is more likely to appear the most disadvantageous temperature field distribution;based on the real side sunshine temperature data of arch rib section,it is feasible to use ANSYS finite element method to analyze the temperature effect of concrete-filled steel tubular arch rib;under the most disadvantageous sunshine temperature difference condition on that day,the whole section of concrete-filled steel tubular arch rib presents a compression trend,the maximum compressive stress value is 9.73 MPa,and the sunshine temperature effect of arch rib should not be ignored.The research results can provide reference for the construction and design of the same type of arch rib structure.
作者
于孟生
邓年春
王龙林
郝天之
张祖军
YU Mengsheng;DENG Nianchun;WANG Longlin;HAO Tianzhi;ZHANG Zujun(College of Civil Engineering and Architecture,Guangxi University,Nanning,Guangxi,530004,China;Guangxi Transportation Science and Technology Group Co.,Ltd.,Nanning,Guangxi,530007,China;Guangxi BeiTou Transportation Maintenance Technology Group Co.,Ltd.,Nanning,Guangxi,530007,China;School of Civil Engineering,Changsha University of Science&Technology,Changsha,Hunan,410114,China)
出处
《公路工程》
2021年第3期99-104,共6页
Highway Engineering
基金
南宁市创新创业领军人才“邕江计划”创新项目(2018-01-04)
国家重点基础研究发展计划(973计划)项目(2015CB057705)。
关键词
特大拱桥
钢管混凝土拱肋
日照温度
温度场
温度应力
extra large arch bridge
concrete-filled steel tubes arch rib
sunshine temperature
temperature field
temperature stress
