摘要
为了确保大沙沟特大桥的大体积混凝土承台冬季施工达到施工要求,采用有限元程序Midas/Civil按照一次浇筑施工、冷却管布置、水流情况及各种不同边界情况进行水化热温度场和温度应力数值分析,并对影响水化热的内外部因素进行了优化分析。采用优化后的数据,承台的实测数据与理论值吻合较好,承台混凝土水化热产生的温度梯度和应力都较小,最大温差在规范要求范围之内,保证了承台的施工质量。
To ensure the mass concrete cap of the Dashagou Large Bridge construction live up to the requirement, the finite element analysis program Midas/civil is applied to establish a three-dimensional solid finite element model of the mass concrete cap. According to a casting construction, cooling tube layout, flow condition and different boundary condition, the temperature field and stress of hydration heat is numerically analyzed, and the influence factors is optimally analyzed. The meas- ured results are in line with the analysis restdts. The temperature gradient and stress of the mass concrete is minor, the maxi- mum temperature difference is within the scope of the standard, but the influence factors must be considered in the construction and monitoring process. The analysis results can be referred to construction of the same type pile caps in the winter.
出处
《铁道建筑技术》
2013年第1期17-20,共4页
Railway Construction Technology
关键词
桥梁工程
大体积混凝土
承台
水化热
温度控制
温度应力
bridge engineering
mass concrete
pier cap
hydration heat
temperature control
temperature stress
