摘要
以国内首座斜独塔单索面钢-砼组合斜拉桥(60+65+220)m为工程背景,根据现场实测温度变化,建立精确的有限元模型,分五个温度荷载工况,每个工况以砼温度升高3℃,钢箱梁温度升高5℃变化并以单元温度荷载形式加载到有限元模型,经过精确的理论计算,比较分析了各个工况下钢-砼组合桥的23对索力和变形,研究结果表明:随着全桥温度的升高,23对拉索索力均发生不同程度的变化,拉索M15处变化最大,可达原有索力的7.74%,钢箱梁M10处变形更是高达74.76 mm,在现场实测索力和钢箱梁铺装时应避免在温度变化较大的时间进行,以提高实测索力的精确度和钢箱梁铺装的耐久性.
Taking the first cable-stayed bridge in China as example,finite element model was set up in line with temperature change at the scene. Force and deformation of 23 pairs of bridge cable were compared in 5 respective situations,in each situation increment of 3℃ in concrete temperature and 5℃ in steel box girder were loaded into the model. Experimental results show that with the bridge temperature rising,cable force of 23 pairs changes at different degree,M15 cable force is the maximum having 7.74% increment,deformation of steel box girder is up to 74.76 mm. Therefore the cable force measurement and steel box girder pavement should be carried out when there are no temperature fluctuation.
出处
《兰州工业学院学报》
2016年第6期18-21,共4页
Journal of Lanzhou Institute of Technology
基金
国家自然科学基金项目(51368032)
关键词
斜拉桥
温度
索力
变形
cable-stayed bridge
temperature
cable force
deformation
作者简介
罗艺（1989-），男，甘肃兰州人，硕士生．
