钢管混凝土拱肋水化热温度场足尺节段试验研究  

Full-scale Model Experimental Study on Hydration Heat Temperature Field of Long-span CFST Arch Rib Segment

作　　者：周倩 周建庭[2] 任伟[2] 杨俊 辛景舟[2] 王俊新 ZHOU Qian;ZHOU Jianting;REN Wei;YANG Jun;XIN Jingzhou;Wang Junxin(Chongqing Jianzhu College,Chongqing 400072,Chongqing 400074,China;State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆建筑工程职业学院,重庆400072 [2]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

出　　处：《应用基础与工程科学学报》2024年第2期546-567,共22页Journal of Basic Science and Engineering

基　　金：重庆市自然科学基金面上项目(CSTB2022NSCQ-MSX0661);重庆市建设科技计划项目(城科字2023第1-10号);重庆市教育委员会科学技术研究项目(KJQN202304301);重庆市交通行业科学技术项目(KJXM2021-0966)。

摘　　要：为揭示山区大跨钢管混凝土拱桥水化热温度场分布特征及演变机理,依托雅鲁藏布江特大桥,开展了强辐射-大温差联合作用下大跨钢管混凝土拱桥节段水化热温度场足尺试验研究和瞬态热分析研究,提出了水化热温度场计算方法,建立了温度与太阳辐射、风速、环境温度的直接理论关系.结果表明:径向温度场夜间呈影响深度D/4的对称三折线分布,正下午时段呈非对称三折线分布,在距向阳侧交界面D/8~D3/8位置突变;周向温度场呈半波比值接近5∶1的正弦曲线分布;向阳侧温度梯度方向不断变化,最大正温差接近30℃,最大负温差接近40℃,涂抹低辐射吸收率材料可有效减小温度梯度.提出的温度场计算方法在适用性上不受气候环境限制,公式计算结果与试验结果及有限元结果吻合良好,表明这种方法可以应用于工程分析.To reveal the distribution characteristics and evolution mechanism of hydration heat temperature field of long-span concrete filled steel tubular(CFST)arch bridge in mountainous area,the full-scale model experiment and transient thermal analysis on hydration heat temperature field of long-span CFST arch rib segment with strong radiation and temperature difference were conducted based on the Yarlung Zangbo River Bridge.The calculation method of hydration heat temperature field was proposed,and the direct theoretical relationship between temperature and solar radiation,wind speed and ambient temperature was established.The results show that:The radial temperature field distributes as a symmetric tri-linear model with an influence depth of D/4 at night,and in the afternoon distributes as an asymmetric tri-linear model with a sudden change at D/8~D3/8 from the sunny side interface.The circumferential temperature field distributes sinusoidally with a half wave ratio of about 5:1.The temperature gradient direction on the sunny side changes continuously with a maximum positive temperature difference of 30℃ and a maximum negative temperature difference of 40℃.Coating low radiation absorptivity materials can effectively reduce the temperature gradient.The temperature field calculation method proposed is not limited by climate environment,and the agreement of the final computation results with the experimental data and finite element data indicates indicates the engineering applicability of this method.

关 键 词：钢管混凝土拱桥 水化热 温度场 足尺节段试验 演化规律 分布模型 温度场计算方法 

分 类 号：U448.222[建筑科学—桥梁与隧道工程]