复杂环境下大直径钢管混凝土构件水化热温度场  

Hydration heat temperature field of large-diameter concrete filled steel tubular member under complex environment

作　　者：周倩 冯鹏程[1] 周建庭[3] 敬世红 郑国徽 章文峰 ZHOU Qian;FENG Pengcheng;ZHOU Jianting;JING Shihong;ZHENG Guohui;ZHANG Wenfeng(China Communications Second Highway Survey,Design and Research Institute Co.,Ltd,Wuhan 430056,China;Chongqing Jianzhu College,Chongqing 400072,China;State Key Laboratory ofMountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Expressway Group Co.,Ltd,Chongqing 401121,China;Chongqing Yuxiang Double Line Expressway Co.,Ltd.,Chongqing 400023,China)

机构地区：[1]中交第二公路勘察设计研究院有限公司,湖北武汉430056 [2]重庆建筑工程职业学院,重庆400072 [3]重庆交通大学省部共建山区桥梁及隧道工程国家重点实验室,重庆400074 [4]重庆高速公路集团有限公司,重庆401121 [5]重庆渝湘复线高速公路有限公司,重庆400023

出　　处：《混凝土》2023年第3期148-153,157,共7页Concrete

基　　金：重庆市自然科学基金面上项目“高寒区钢管混凝土拱桥温度场及温度效应研究”(CSTB2022NSCQ-MSX0661);重庆市交通行业科学技术项目“峡谷大跨径上承式双联钢管混凝土拱桥设计施工关键技术研究”(KJXM2021-0966)。

摘　　要：为揭示高原地区大跨钢管混凝土拱桥水化热温度场分布特征和演化机理,应用ANSYS瞬态热分析法开展强辐射-大温差-水化热联合作用下大直径钢管混凝土构件温度场研究。研究表明:中心混凝土温度先增加后降低至某一温度稳定,靠外侧混凝土温度呈振幅变化的正弦规律时变,越靠近交界面,振幅越大。向阳侧最高温度高于背阳侧最高温度约20℃。正下午时段,从向阳侧至中心,温度沿径向先减小后升高,转折点距交界面D/8,中心至背阳侧,温度逐渐降低。夜间混凝土温度沿各径向对称分布,距交界面D/4至中心段温度较大且接近。各径向向阳侧和背阳侧最大温度梯度呈正弦曲线日变化。沿径向距交界面D/8至中心段日温差接近,约为向阳侧交界面混凝土日温差的1/8。水化热温度场试验证明有限元法结果满足工程精度要求,研究成果可为此类拱桥建设和完善现行规范提供依据。To reveal the distribution characteristics and evolution mechanism of hydration heat temperature field of long-span concrete-filled steel tubular arch bridges in plateau,the temperature field of large diameter concrete-filled steel tubular member under strong radiation,large temperature difference and hydration heat was studied with ANSYS transient thermal analysis method-Results showed the temperature of central concrete first increased and then decreased to a stable temperature,the temperature of outer concrete changed in a sinusoidal curve with variable amplitude,and the closer to the interface,the greater the ampEtude was.The maximum temperature on the sunny side was about 20℃ higher than that on the back sunny side.The temperature decreased first from the sunny side to its D/8 then increased to the center and gradually decreased from the center to the back side in the aftemootiThe temperature was distributed symmetrically along each radial direction,and was larger and approximate from D/4 of interface to center.The maximum temperature gradients on the sunny side and back side along each radial direction changed in a sinusoidal curve.The diurnal temperature difference from P/8 of interface to center was approximate and was 7/8 times smaller than that in the sunny side.The results of finite element method is verified by experiment study,which can provide basis for construction of such arch bridge and for perfecting the current standard.

关 键 词：钢管混凝土 水化热温度场 温度梯度 日温差 瞬态热分析 

分 类 号：TU528.7[建筑科学—建筑技术科学]