空心混凝土基础固化期温度场测试与数值分析  

Analysis of Hollow Concrete Temperature in Curing Age with Test and Numerical Simulation

作　　者：卢玉林 陈晓冉[3] 王丽 LU Yu-lin;CHEN Xiao-ran;WANG Li(School of Civil Engineering, Institute of Disaster Prevention, Sanhe 065201, China;Key Laboratory of Building Collapse Mechanism and Disaster Prevention, China Earthquake Administration, Sanhe 065201, China;School of Geological Engineering, Institute of Disaster Prevention, Sanhe 065201, China)

机构地区：[1]防灾科技学院土木工程学院,三河065201 [2]中国地震局建筑物破坏机理与防御重点实验室,三河065201 [3]防灾科技学院地质工程学院,三河065201

出　　处：《科学技术与工程》2021年第34期14755-14761,共7页Science Technology and Engineering

基　　金：中国地震局建筑物破坏机理与防御重点实验室开放基金(FZ211104)。

摘　　要：为有效避免混凝土浇筑期出现温度裂缝,通过现场测试和数值模拟的方式分析了空心设备基础固化期的温度场分布特点,得到了不同位置的温度变化规律。数值和测试结果表明,两种方式得到的观测点最高温度具有良好的一致性,均在经验法估算的区间之内。不同观测点的温度变化规律并不一致,测点中部位置温度最高,底部温度次之,顶部温度最小。顶部温度变化剧烈与环境温度的变化表现出一致性,数值模拟中设置了大气温度变化的简谐曲线函数,结果与监测温度的总体变化规律较为相符。观测点中部-顶部和中部-底部温差都在25℃以内,混凝土外表面与大气的温差最大值为12℃,满足规范要求。现场测试结果表明,应设置监测大气和地基的温度观测点,并设置合理的边界条件以提高数值模拟的精度。In order to effectively avoid temperature cracks during pouring period,the temperature field characteristics of a hollow concrete foundation was researched by the numerical simulation and field test methods,and the laws of temperature changed in different positions with curing time were obtained.The results of numerical simulation and test show that the highest temperature of the monitoring points obtained by the two methods have a good consistency,both of which are within the range estimated by the empirical method.The temperature curves of monitoring points follow different laws,the temperature in the middle of concrete is the highest,and the top is lowest.The change of the top temperature is consistent with the air temperature,and this result compared relatively well with the numerical results,which set to the boundary condition with the simple harmonic curve function of air temperature.The temperature difference of inner-surface is less than 25℃,and the temperature difference between the surface of concrete and air is less than 12℃,these data are proved to be reasonable compared with the technical code.The results show that it should be set the temperature observation points to monitor the temperature of atmosphere and foundation,and set the reasonable boundary conditions to improve the accuracy of numerical simulation.

关 键 词：混凝土 固化期 温度场 现场测试 数值模拟 

分 类 号：TU755.7[建筑科学—建筑技术科学]