摘要
为防止长宽比大于2的斜拉桥主塔承台混凝土结构产生的温度裂缝缩短桥梁使用寿命,对配合比进行了合理设计,并沿顺桥向、横桥向各布置了2层冷却水管.利用有限元仿真软件MIDAS FEA对承台的应力场和温度场的变化进行了数值分析;结果表明:承台混凝土内部最高温度呈先快速上升后缓慢下降的趋势,当浇筑温度为27℃时,最高温度61.3℃,出现在混凝土浇筑后的44 h;初期受昼夜温差影响,混凝土表面温度有小幅波动,随后表面温度变化与混凝土最高温度变化趋势基本一致;混凝土最大内表温差19.3℃出现在74 h,处于混凝土降温初期,此时混凝土表面温度降温速度快于混凝土内部.
In order to prevent the service life shortening of the bridge caused by temperature cracks in concrete structure of main tower cap of cable-stayed bridge with aspect ratio greater than 2,the mix ratio was reasonably designed,and two cooling pipes were arranged along the bridge direction and along the transverse bridge direction.The finite element simulation software MIDAS FEA was used to analyze the stress field and temperature field of the cap.The results showed that:(1)The maximum internal temperature of the cap concrete rose rapidly and then decreased slowly.When the pouring temperature was 27℃,the highest temperature was 61.3℃,which occurred 44 h after concrete pouring.(2)The temperature of the concrete surface fluctuated slightly due to the temperature difference between day and night,and then the trend of surface temperature change was basically the same as that of the maximum temperature change of the concrete.(3)The maximum internal temperature difference of the concrete occurred at 19.3℃at 74 h,which was at the initial stage of the concrete cooling.At this time,the concrete surface temperature was cooled faster than that of the interior concrete.
作者
赵家康
张玥
张振国
ZHAO Jiakang;ZHANG Yue;ZHANG Zhenguo(Civil Engineering School,Inner Mongolia University of Science and Technology,Baotou 014010,China;China Second Metallurgy Group Co.,Ltd.,Baotou 014010,China)
出处
《内蒙古科技大学学报》
CAS
2019年第4期389-393,403,共6页
Journal of Inner Mongolia University of Science and Technology
关键词
大体积混凝土
有限元模拟
温度应力
监测
mass concrete
finite element simulation
thermal stress
monitoring
作者简介
赵家康(1994-),男,河南新密人,内蒙古科技大学硕士研究生,研究方向为桥梁工程;通讯作者:张玥(1968-),男,内蒙古乌兰察布人,内蒙古科技大学副教授,硕士,研究方向为道路与铁道工程,桥梁与隧道工程.
