高寒地区预制混凝土箱涵水化热温度效应与开裂风险研究  

Study on hydration heat temperature effect and cracking risk of precast concrete box culvert in alpine region

作　　者：黎福禄 马志元 张永亮 钱松 刘江[2] LI Fulu;MA Zhiyuan;ZHANG Yongliang;QIAN Song;LIU Jiang(Qinghai Traffic Control Construction Engineering Group Co.,Ltd.,Xining 810002,Qinghai,China;School of Highway,Chang an University,Xi an 710064,Shaanxi,China;China United Northwest Institute for Engineering Design&Research Co.,Ltd.,Xi an 710076,Shaanxi,China)

机构地区：[1]青海省交控建设工程集团有限公司,青海西宁810002 [2]长安大学公路学院,陕西西安710064 [3]中联西北工程设计研究院有限公司,陕西西安710076

出　　处：《建筑科学与工程学报》2025年第2期153-164,共12页Journal of Architecture and Civil Engineering

基　　金：青海省重点研发与转化计划项目(2021-SF-166)。

摘　　要：为研究高寒地区大尺寸预制混凝土箱涵水化热温度场分布规律,降低箱涵预制期间早龄期开裂风险,对青海地区预制混凝土箱涵开展水化热温度有限元模拟计算,分析了混凝土箱涵水化热温度时程变化及温度分布特点。基于考虑混凝土龄期增长的温度应力计算方法,评估了水化放热期间的混凝土箱涵开裂风险。通过参数分析得到了不同因素对混凝土箱涵水化热温度作用的影响规律。结果表明:混凝土箱涵受水化作用影响的温度时程变化过程可以分为水化升温、水化降温及环境影响阶段;截面内水化热温度呈现出以形心为中点的放射状分布;混凝土箱涵顶面及底面应力水平较高,其中倒角顶面内侧位置应力最大,为1.71 MPa;混凝土箱涵倒角位置由于框架效应产生的次应力最显著,故开裂风险最高;材料属性、结构参数、环境作用对混凝土箱涵预制期间水化热温度作用均有显著的影响,其中材料属性的影响最为显著;通过降低水泥水化放热量,减少混凝土水泥掺量,减小箱涵尺寸,减小初始温度和降低顶面对流换热系数等参数可以有效降低混凝土箱涵早期开裂风险;可以通过调整材料属性、结构参数及环境作用来优化混凝土箱涵设计及施工方案,以降低早期开裂风险。In order to study the distribution law of hydration heat temperature field of large size precast concrete box culvert in alpine area,and reduce early age cracking risk during precast of box culvert,the finite element simulation calculation of hydration heat temperature of precast concrete box culvert in Qinghai area was carried out,and the time history change and temperature distribution characteristics of hydration heat temperature of concrete box culvert were analyzed.Based on the temperature stress calculation method considering the growth of concrete age,the cracking risk of concrete box culverts during the hydration heat release period was evaluated.The effects of different factors on the effect of hydration heat temperature on concrete box culverts were obtained by parametric analysis.The results show that the temperature time history change process of concrete box culverts affected by hydration can be divided into hydration heating stage,hydration cooling stage and environmental influence stage.The distribution of hydration heat temperature shows a radial distribution with the shape center as the midpoint.The stress levels on the top and bottom surfaces of concrete box culvert are relatively high,with the highest stress at the inner side of the chamfer top surface,which is 1.71 MPa.The chamfer position of the concrete box culvert has the highest cracking risk due to the significant secondary stress generated by the frame effect.The material properties,structural parameters,and environmental effects have a significant impact on the hydration heat temperature during precast of concrete box culverts,with the most significant effect of material properties.By reducing the cement hydration heat release,reducing the concrete cement mixture,reducing the size of box culvert,reducing the initial temperature,reducing the top surface flow heat transfer coefficient and other parameters can effectively reduce the risk of early cracking of concrete box girders.The design and construction plan of concrete box girder can b

关 键 词：水化热 混凝土箱涵 高寒地区 温度效应 开裂风险 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]