摘要
系统地介绍了沪通长江大桥28#主墩承台大体积混凝土浇筑过程中采取的温控措施,并对施工过程中的温度-应力进行了实时监测。利用混凝土水化热检测、现场资料收集得到各项计算参数,建立了有限元计算模型。通过对比分析现场实测与有限元计算结果,得到了混凝土承台整体温度变化规律,提出了通过减小芯-表温峰时间差的方法来减小混凝土芯-表温差的温控思路,并研究了承台内部温度梯度沿承台厚度方向、水平方向的时变规律,初步分析了承台内部钢筋应力沿水平方向的时变规律,最后对承台进出口水温差的变化规律进行了分析。研究证明了对承台大体积混凝土采取温控措施的必要性和有效性,可为类似大体积混凝土设计与施工提供有益参考。
It was systematically introduced the temperature control measures adopted in the mass concrete pouring of the pier # 28 of the Hutong Changjiang River Bridge and carried out real-time monitoring of the temperature-stress during the construction. Using the concrete hydration heat detection,the field data was collected to obtain the calculation parameters,and the finite element calculation model was built. By comparing the results of on-site measurement and finite element analysis,the temperature variation of concrete cap was obtained. The temperature control idea of reducing the temperature difference of concrete core by reducing the time difference of core surface temperature and peak temperature was put forward. The time-varying regularity of the temperature gradient along the thickness and the horizontal direction of the cap were studied. The time-varying regularity of stress along the horizontal direction of the cap was analyzed preliminarily. Finally,the changing rules of water temperature difference between import and export of cap were analyzed. The research proves that it is necessary and effective to take temperature control measures on the mass concrete in the platform so as to provide useful reference for the design and construction of similar mass concrete.
作者
杨彦鑫
周和祥
马建林
张凯
蔡文俊
YANG Yan-xin;ZHOU He-xiang;MA Jian-lin;ZHANG Kai;CAI Wen-jun(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《硅酸盐通报》
CAS
北大核心
2019年第5期1497-1502,1509,共7页
Bulletin of the Chinese Ceramic Society
基金
国家重点研发计划(2016YFC0802203-1)
关键词
大体积混凝土
承台
温控措施
温度
应力
mass concrete
cap
temperature control measure
temperature
stress
