摘要
通过Midas有限元分析软件模拟冬季低负温条件下大体积混凝土内部温度场,分析了入模温度和表面保温措施对混凝土温度场的影响,最后通过现场试验验证了模拟结果的准确性。研究结果表明:(1)随着入模温度的提高,混凝土内部温度随之提高,表面温度无明显增长,里表温差逐渐增大。(2)施加保温措施后,表面温度随保温措施的增加而大幅升高,里表温差降低明显。(3)通过模拟施加3、5 cm厚度保温措施后,保温层厚度为5 cm时能够保证里表温差在20～25℃之间;Midas模拟结果与现场实测结果接近度较高。
With the help of Midas finite element analysis software,based on simulating the condition of minus degree centigrade in winter,this paper has analyzed the influence of pouring temperature and heat-preservation measures on surface on heat-hydration performance.Moreover,we will examine the validity through on-the-spot investigation.The outcomes of the research are as follow:(1)With the increase of pouring temperature,the temperature inside concrete increases as well.However,temperature on the concrete surface dose not increase and the temperature gap between inside and outside aggravate gradually.(2)With heat-preservation measures,the surface temperature decreased rapidly,the temperature gap between inside and outside of concrete was narrowed down evidently.(3)We reinforced three centimeters and five centimeters when we applied the heat-preservation measures in experiments,and concluded that the temperature gap maintains around20to25Celsius degree in the condition of5centimeters heat-preservation measures.What′s more,the outcomes given by Midas simulating condition are quite similar to the results of on-the-spot examinations.
作者
王振宇
王起才
代金鹏
谢智刚
白杰
郑梁
WANG Zhenyu;WANG Qicai;DAI Jinpeng;XIE Zhigang;BAI Jie;ZHENG Liang(Lanzhou Jiaotong University,Lanzhou 730070,China;Bridge Engineering National Local Joint Engineering Laboratory of Disaster Prevention and Control Technology,Lanzhou 730070,China;Key Laboratory of Road and Bridge and Underground Engineering of Gansu Province,Lanzhou 730070,China;China Railway Construction the 20th Group Municipal Engineering Co.,Ltd.,Lanzhou 730070,China)
出处
《混凝土》
CAS
北大核心
2018年第11期140-144,共5页
Concrete
基金
国家自然基金(51768033)
长江学者和创新团队发展计划滚动支持(IRT_15R29)
中国交建2016年创新平台建设应用基础研究项目(2016-ZJKJ-PTJS04)
兰州交通大学青年科学基金(2017015)
兰州交通大学优秀科研团队资助项目(201606)
甘肃省高校协同创新科技团队支持计划资助项目(2017C-08)
关键词
水化热
放热系数
数值模拟
里表温差
heat of hydration
heat transfer coefficient
the gap between inside and outside
