摘要
以江苏省宜兴市范蠡大桥为例,采用空间有限元模型,研究了施工过程中大桥主梁纵向应力分布特性及剪力滞效应。研究结果显示:斜拉桥主梁纵向应力在横向分布很不均匀,与初等梁理论的计算结果有较大差异;在同一施工工况下,不同截面的纵向应力横向分布差异较大,钢锚箱附近的截面比远离钢锚箱的截面更不均匀;施工工况对截面剪力滞系数影响较大,顶板剪力滞系数在0.4～3.5之间变化,底板剪力滞系数则在0.4～1.9之间变化。
Taking the Fanli Bridge in Yixing, Jiangsu Province as an example, the spatial finite element model has been used to study the longitudinal stress distribution and shear lag effect of bridge main girder in the process of construction. The results show that the longitudinal stress of main girder of cable-stayed bridge is unevenly distributed, which is very different from the calculation results of the elementary beam theory. The longitudinal stress of different sections varies greatly under the same construction condition, and the cross-section near steel anchor box is more uneven than that of far away from steel anchor box. The construction condition has a great influence on the shear lag coefficient of the section, and the shear lag coefficient of roof slab is changed between the range of 0.4 and 3.5, and the shear lag coefficient of bottom plate changes between the range of 0.4 and 1.9.
作者
张斌
ZHANG Bin(Shanghai Urban Construction Municipal Engineering （Group） Co., Ltd., Shanghai 200065, Chin)
出处
《建筑施工》
2018年第5期760-762,共3页
Building Construction
关键词
斜拉桥
钢箱梁
剪力滞系数
施工工况
应力分布
cable-stayed bridge
steel box girder
shear lag coefficient
construction condition
stress distribution
