摘要
Abstract
To reduce the risk of harmful cracks in large-volume concrete due to the temperature difference between the inside and outside,taking the large-volume concrete foundation of a large bridge pier as the engineering background,the finite element software ABAQUS was used to establish a three-dimensional simulation model of the temperature field and stress field of hydration heat,systematically simulating the entire process of concrete heating,peak and cooling.Reveal the spatiotemporal distribution laws of the temperature field and stress field within the foundation.The results show that the maximum temperature rise of the concrete can reach 65.0℃,and the maximum tensile stress is 2.8 MPa.It is concluded that the center area of the foundation is a high-risk area for cracks.Based on the simulation results,a comprehensive crack control scheme including raw material selection and intelligent water cooling is proposed.Practical experience has shown that this scheme effectively keeps the temperature difference between the inside and outside of the concrete within 25℃,reduces the maximum tensile stress to below 1.5 MPa,and successfully suppresses the occurrence of harmful cracks,providing a theoretical basis and practical reference for crack control in similar large-volume concrete projects.关键词
大体积混凝土/水化热/温度场/应力场/有限元仿真/裂缝控制Key words
Mass concrete/Heat of hydration/Temperature field/Stress field/Finite element simulation/Crack control分类
交通工程
