大体积混凝土低桩承台温度场分布及温度效应研究  

Research on temperature field distribution and temperature effects of mass concrete low-pile pier cap

作　　者：詹新彬 白晨阳 张羽[1] 郭育霞[2] 刘俊 ZHAN Xinbin;BAI Chenyang;ZHANG Yu;GUO Yuxia;LIU Jun(Beijing Urban Construction Group Co.,Ltd.,Beijing 100088,China;College of Mining Technology,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]北京城建集团有限责任公司,北京100088 [2]太原理工大学矿业工程学院,山西太原030024

出　　处：《混凝土》2024年第10期171-177,共7页Concrete

基　　金：国家自然科学基金面上项目(51974192)。

摘　　要：为研究大体积混凝土低桩承台早龄期温度场分布规律以及热效应引起的应变演化规律,以太原武宿机场T3航站楼工程中某一低桩承台为研究对象,对承台内部不同位置进行了时长为300 h的温度和应变跟踪监测试验,并采用Midas/FEA进行建模计算,对比分析了观测点温度和应变随时间变化的趋势。结果表明:在浇筑后约51 h内,承台内部处于温升阶段,峰值温度出现在承台中心区域,达54.4℃,此时承台内部最大温差为20.3℃,承台内部压应变急剧增加;51 h后,进入降温阶段,承台内部温度场趋于稳定,承台内部应变场以压应变为主,表面应变逐渐由压变拉,且受外围地基作用沿水平方向自中心至角点区域逐渐减小,最大温度应变为107.5με。现场监测试验数据与有限元计算结果吻合度较高,二者结合可以为大体积混凝土施工提供质量监控保证。To study the distribution law of temperature field in the early age of mass concrete low-piled pier caps and the evolution law of strain caused by thermal effects,it takes a low-piled pier cap in the construction of T3 terminal at Taiyuan Wusu Airport as the research object.A 300 hours temperature and strain tracking monitoring experiment was conducted at different locations inside the pier cap,and Midas/FEA was used for modeling calculations to compare and analyze the trends of temperature and strain at observation points over time.The results show that within approximately 51 hours after pouring,the interior of the pier cap enters the temperature rising stage,with the peak temperature appearing in the central region of the pier cap,reaching 54.4℃.At this time,the maximum temperature difference inside the pier cap is 20.3℃,and the compressive strain inside the pier cap increases rapidly.After 51 hours,it enters the cooling stage,the temperature field inside the pier cap tends to stabilize,the compressive strain dominates the internal strain field,and the surface strain gradually changes from compression to tension.Under the influence of the surrounding foundation,the strain decreases gradually along the horizontal direction from the center to the corner region,with the maximum temperature strain being 107.5με.Lastly,the on-site monitoring experimental data align well with the results from finite element calculations,and their combination can provide quality control assurance for mass concrete construction.

关 键 词：大体积混凝土 水化热 温度场 应变监测 仿真分析 

分 类 号：TU528.01[建筑科学—建筑技术科学]