大跨度悬索桥钢箱梁吊装精细化分析  

Refined Analysis of Hoisting and Installation of Steel Box Girder of Long Span Suspension Bridge

作　　者：钟继卫[1] 

机构地区：[1]中铁大桥局集团桥科院有限公司,湖北武汉430034

出　　处：《桥梁建设》2010年第6期9-12,共4页Bridge Construction

摘　　要：钢箱梁吊装是悬索桥施工的一个重要工序,吊装过程中结构的内力和变形变化显著,为保证施工过程安全,以武汉阳逻长江大桥为例,建立考虑索鞍接触、双吊索、梁段连接等实际构造特性的精细化有限元模型,分析钢箱梁吊装过程中结构的变形及钢箱梁吊装过程中主索鞍的顶推工艺。分析可知:钢箱梁底板开口距在吊装前期较大,后期逐渐减小;吊装过程中,钢箱梁线形从明显的凹曲线,逐渐转变为凸曲线并最终达到设计线形;吊装过程中跨缆吊机需设置最小预偏量;同一吊点内、外侧吊索存在的拉力差随着吊装进行不断减小。The hoisting and installation of steel box girder is an important procedure in the construction of suspension bridge and in the hoisting and installation, the structural internal force and structural deformation of the bridge often experience significant changes. To ensure the safety of the construction, by way of example of Wuhan Yangluo Changjiang River Bridge, the author herewith establishes a refined finite element model that takes into account of the practical structural formation characteristics, such as the cable and saddle contact, double suspenders and girder block connection and analyzes the structural deformation and the tower saddle pushing procedures in the hoisting and installation of the steel box girder. It is known from the analysis that the opening gap spacing at the bottom plates of the girder blocks is large at the early stage of the hoisting and installation and gradually becomes small at the late stage. In the hoisting and installation, the geometric alignment of the girder gradually changes from the obvious concave curve to the convex curve and will finally come up to the designed alignment. For the cable-supported crane, the minimum offsetting amount is required to be preset and at the same hoisting point, the tensioning force differences between the inner side and outer side suspenders should be incessantly reduced with the proceeding of the hoisting and installation.

关 键 词：悬索桥 武汉阳逻长江大桥 钢箱梁 吊装 线形 有限元法 分析 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]