桥墩承台大体积混凝土温度场监测与有限元分析  

Temperature Field Monitoring and Finite Element Analysis of Mass Concrete for Bridge Bearing

作　　者：曹青 CAO Qing(China Railway Construction Group Co.Ltd.,Beijing 100040,China;Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]中铁建设集团有限公司,北京100040 [2]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124

出　　处：《铁道建筑》2024年第9期86-91,共6页Railway Engineering

基　　金：中国铁建股份有限公司科技研发计划项目(2020-B01)。

摘　　要：为控制大体积混凝土浇筑后里表温差过大及温度裂缝的不利影响,通过对无冷却水管试验墩和有冷却水管承台的大体积混凝土温度场进行监测,研究在有无冷却水管降温措施下大体积混凝土内部温度场的分布及变化规律,并建立有限元模型分析有限元模拟结果与实测数据之间的差异。结果表明:大体积混凝土浇筑后,混凝土升温速率大于降温速率;布设冷却水管降温措施可以明显降低大体积混凝土中心温度;升降温阶段,混凝土内部和表面温度升降温速率基本相同,且从内到外温度变化呈递减趋势,但无线性关系;有限元模拟结果与实测数据吻合较好。To control the adverse effects of excessive temperature difference between the inner and outer surfaces and temperature cracks after pouring mass concrete,the temperature field of mass concrete without cooling water pipe test piers and with cooling water pipe abutments was monitored.The distribution and variation law of the internal temperature field of mass concrete with and without cooling water pipe cooling measures were studied,and a finite element model was established to analyze the difference between the finite element simulation results and the measured data.The results show that after pouring mass concrete,the heating rate of the concrete is greater than the cooling rate.The installation of cooling water pipes and cooling measures can significantly reduce the center temperature of mass concrete.During the temperature rise and fall stages,the rates of temperature rise and fall inside and on the surface of the concrete are basically the same,and the temperature changes from inside to outside show a decreasing trend,but there is no linear relationship.The finite element simulation results are in good agreement with the measured data.

关 键 词：大体积混凝土 桥墩承台 现场监测 水化热分析 温度场 降温措施 

分 类 号：U443.25[建筑科学—桥梁与隧道工程]