摘要
依托某在建连续刚构桥监控项目,采用有限元软件模拟实际施工过程,分析了连续刚构桥悬臂施工过程中停工阶段截面挠度实测值和理论值差异;并对不同停工位置,不同停工时间分各种情况展开研究;对影响停工阶段截面发生挠度值大小和方向的主要原因进行了总结。结果表明,不同停工位置、不同停工时间产生截面挠度均有较大差异;应力环境变化对停工阶段徐变效应产生截面挠度影响比重较大。实际施工过程中应依据停工时间、环境要素、工程特点结合仿真模型预估结构悬置期间可能挠度值,做好主动调整。
Relying on a monitoring project of continuous rigid bridge under construction,the finite element software is used to simulate the actual construction process to analyze the difference between the measured value and theoretical value of section deflection during stoppage period of cantilever construction.A variety of situations are carried out to study the influences of different cantilever lengths and different duration of downtime.The main reasons influencing the magnitude and direction of the deflection during downtime are analyzed.The results of the study indicate that：deflection is quite different with the variation of cantilever lengths and duration of downtime;the change of stress environment has a great influence on the deflection of the creep effect during downtime.At the construction site,contractor should estimate the possible deflection during the downtime and take the initiative to adjust based on duration of downtime,environmental factors,engineering characteristics,combining with the simulation.
出处
《公路》
北大核心
2018年第3期101-107,共7页
Highway
关键词
桥梁工程
连续刚构桥
悬臂浇筑
有限元
收缩徐变
研究
bridge engineering
continuous rigid frame bridge
cantilever casting
finite element
shrinkage and creep
study
