摘要
大体积混凝土养护时会释放大量水化热,由于混凝土体量大、散热性差,容易形成很大的里表温差,从而导致温度裂缝的产生。为了掌握大体积混凝土温度场分布规律,对北京市通州区运河东大街丰字沟景观桥承台进行了研究,利用Midas FEA有限元分析软件对承台浇筑后500 h内的温度场进行数值模拟,并着重分析了入模温度为10、15、20℃时温度场随时间变化曲线。结果表明:随着入模温度升高,混凝土核心温度、表面温度前期升温速率加快,温度峰值及里表最大温差增大,达到温度峰值的时间缩短。
The hydration heat of mass concrete release generous heat.Because of the heat and poor heat dissipation of mass concrete,it is easy to form a large temperature difference between the inner surface and the surface that would result in temperature cracks.In order to know the distribution law of temperature field of mass concrete,the bearing platform of Fengzigou landscape bridge in Yunhe East street,Tongzhou District,Beijing is studied.The temperature field within 500 hours after the pile cap is numerical simulated by finite element analysis software MIDAS FEA.when the molding temperature is 10℃,15℃and 20℃,the temperature field curve with time is analyzed emphatically.The results show that all of the temperature of the core,surface,the early heating rate of inner surface temperature difference and temper ature peak value increase with the increase of injection temperature.The time to reach peak temperature is shortened.
作者
陈斌
Chen Bin(Beijing 1st Municipal Engineering Construction Co.,Ltd.,Beijing 100083,China)
出处
《市政技术》
2020年第6期67-69,77,共4页
Journal of Municipal Technology
关键词
大体积混凝土
水化热
温度场
数值模拟
入模温度
mass concrete
hydration heat
temperature field
numerical simulation
molding temperature
