摘要
为研究非对称单侧悬臂施工斜拉桥施工时的敏感参数,分别以成桥状态和最大悬臂状态相关力学指标为控制目标,采用不同的方法分析了主梁混凝土容重、混凝土弹性模量、斜拉索弹性模量、斜拉索初张力、主梁预应力荷载、施工临时荷载以及边跨填充铁块荷载等参数对各控制目标的影响程度.结果 显示:以成桥状态主梁线形、主梁顶底面应力以及成桥索力为控制目标,将各参数增加10%的幅值,得出主要的结构影响参数为斜拉索初拉力和主梁混凝土容重;以最大悬臂状态悬臂端竖向变形和主梁根部顶底面应力为控制目标,以参数敏感度为指标,分析得出此状态下主要的结构影响参数同样为斜拉索初拉力和主梁混凝土容重.以敏感度为指标可以量化判断参数敏感性,建议进行具体分析时可采用此类方法.
With the related mechanical index of finished bridge state and maximum cantilever status as the control targets,the author analyzed the girder concrete density,elastic modulus of concrete and the stay cables,initial tension of the cables,girder prestressed load,temporary construction load and counterweight iron load on side span on the influence degree of the control targets,with a view to study the sensitive parameters of cable-stayed bridge constructed by asymmetric single cantilever method.The results show that taking the girder alignment,the stress of the top and bottom surface of the girder and the cable force in finished bridge state as the control targets,increasing the amplitude of each parameter by 10%,it is concluded that the main structural influencing parameters are the initial tension of the cables and the girder concrete density.Taking the vertical deformation of the cantilever end and the stress on the top and bottom surface of the bottom of the main beam in the maximum cantilever state as the control targets,and with the parameter sensitivity as the index,the analysis shows that the main influence parameters in this state are the initial tension of the cables and the girder concrete density.The conclusions of the two analysis methods are basically the same.The sensitivity as the index can be used to quantify the sensitivity of the parameters,and this method is recommended for specific analysis.
作者
俞文龙
朱飞
张胜雷
Yu Wenlong;Zhu Fei;Zhang Shenglei(China Railway 17^th Bureau Group Co.Ltd.,Taiyuan Shanxi 030006,China;China Railway 17^th Bureau Group Shanghai Rail Transit Engineering Co.Ltd.,Shanghai 200135,China)
出处
《铁道建筑技术》
2019年第11期14-17,41,共5页
Railway Construction Technology
基金
中铁十七局集团科技研究开发计划项目(2019-20)
关键词
非对称斜拉桥
结构参数
敏感性分析
量化
asymmetrical cable-stayed bridge
structural parameter
sensitivity analysis
cjuantification
