摘要
Abstract
In order to study the temperature and stress distribution law of mass concrete of bridge pier after pouring,and verify the influence of cold water pipe layout on the structure hydration heat control,a three-dimensional finite element model of bridge pier was established by ABAQUS finite element software,and the change law of internal temperature and stress of the structure was analyzed.The temperature field and stress field with or without cold water pipe were compared.The results show that during the construction process,the central temperature of the mass concrete of the bridge pier presents a trend of first rising and then decreasing,and the highest temperature reaches61.5℃,com-pared with the initial temperature,the maximum temperature rise is 43.8℃,which meets the requirements of relevant specifications.At the same time,the tensile force on the outer surface of the structure caused by the temperature difference between inside and outside reaches 5.12 MPa,which is 1.2 times more than the standard limit,and there is a large risk of cracking.By setting the cold water pipe,the maximum temperature of the structure is reduced by 5.9℃,which is 9.8%.The maximum tensile stress decreased to 3.31 MPa,a reduction of 35.4%.Therefore,the installation of cold water pipes can effectively control the temperature and stress of the mass concrete of bridge piers,thereby reducing the risk of cracking.关键词
大体积混凝土/温度场/应力场/数值模拟Key words
Mass concrete/Temperature field/Stress field/Numerical simulation分类
交通工程
