摘要
为提高钢管混凝土桥梁应对温度响应的能力,梳理了钢管混凝土桥梁在水化热和环境因素影响下面临的关键温度问题,总结了钢管混凝土桥梁施工和运营阶段温度作用与效应、界面热脱黏以及温度效应计算方法等的研究进展,探讨了未来的研究方向。研究结果表明:施工阶段,空钢管拼装受日照温度场影响显著,需对拼装线形进行精准调控,管内混凝土水化热导致大管径(大于1.2 m)截面的温升和里表温差均超过30℃,开裂风险较高,钢管混凝土拱的合龙温度取值存在争议,需结合累积内力反算;在运营阶段,气温变化和太阳辐射分别引起均匀温度和截面非线性温度梯度(温差大于10℃)作用,温度效应对钢管混凝土桥梁的应力、内力、变形和稳定性均有较显著的影响,并通过加速混凝土徐变改变结构的长期响应;钢管与核心混凝土间温差易诱发钢-混界面拉应力超限和热脱黏,脱黏高度为0.03~0.72 mm,通过红外热成像和分布式光纤等热感知技术可有效检测界面脱黏。现有规范对温度作用模式和线膨胀系数等的界定尚存不足,热弹性力学分析和能量法等解析法以及精细化热-力耦合模拟为温度效应计算提供支撑,未来需进一步研发低水化热和辐射吸收率材料,推广界面连接件应用,开展长期热损伤演化评估以及优化超大跨钢管混凝土桥梁温度控制策略,并完善相关设计规范。研究结果为钢管混凝土桥梁的高品质建造与长寿命运维提供理论参考。
Key temperature issues faced by concrete-filled steel tube(CFST)bridges under the influence of hydration heat and environmental factors were compiled to enhance their capacity in addressing temperature response.Research advances in temperature actions and effects during construction and operation,interfacial thermal debonding,and computational methods for temperature effects were reviewed,and future research directions were discussed.Research findings indicate that the assembly of empty steel tubes is significantly influenced by the solar temperature field during the construction stage,and thus assembly demands precise alignment control.The hydration heat of concrete in the tubes results in that the temperature rise at large-diameter(>1.2 m)sections and the core-surface temperature differences are over 30℃,raising concrete cracking risks.There is controversy regarding the selection of the closure temperature for CFST arches.It requires back-calculation with cumulative internal force.In operation,air temperature variations induce uniform temperature changes,while solar radiation creates nonlinear temperature gradients(temperature difference>10℃)at sections.Temperature effects significantly impact stress,internal force,deformation,and stability and alter the long-term response of the structure by accelerating concrete creep.The temperature difference between the steel tube and core concrete can easily induce excessive tensile stress at the steel-concrete interface and thermal debonding,with the debonding height ranging from approximately 0.03 to 0.72 mm.Interface debonding can be effectively detected via infrared thermography,distributed fiber optic sensing,and other temperature sensing technologies.Current codes lack precise definitions for temperature action patterns and linear expansion coefficients.Analytical methods(such as thermoelastic analysis and energy method)and refined thermo-mechanical coupling simulation provides support for calculations of temperature effects.Future priorities include developing materials with low hydration heat and radiation absorptivity,promoting the application of interface connectors,implementing long-term thermal damage evolution and assessment,optimizing temperature control strategies for super-long-span CFST bridges,and refining relevant design codes.The research results offer a theoretical reference for the high-quality construction and long-life operation and maintenance of CFST bridges.
作者
刘永健
闫新凯
刘江
陈宝春
姜磊
吕毅
LIU Yong-jian;YAN Xin-kai;LIU Jiang;CHEN Bao-chun;JIANG Lei;LYU Yi(School of Highway,Chang'an University,Xi'an 710064,Shaanxi,China;School of Civil Engineering,Chongqing University,Chongqing 400044,China;School of Civil and Transportation Engineering,Ningbo University of Technology,Ningbo 315211,Zhejiang,China;School of Civil Engineering,Fujian University of Technology,Fuzhou 350108,Fujian,China)
出处
《交通运输工程学报》
北大核心
2025年第5期159-179,共21页
Journal of Traffic and Transportation Engineering
基金
国家自然科学基金项目(51978061,52108111)
青海省科技厅重点研发与转化计划(2024-GX-117)。
关键词
桥梁工程
钢管混凝土桥梁
综述
温度效应
水化热
温度梯度
热脱黏
bridge engineering
concrete-filled steel tube bridges
review
temperature effect
hydration heat
temperature gradient
thermal debonding
