空间索形悬索桥吊装施工过程分析方法

以主缆与吊索的下料长度、索夹安装位置为联系,构建吊索下端力矩阵,并建立各个施工阶段临时体系相互独立的平衡方程.分别采用考虑重力的多段二力杆、分段三维悬链线来分析空间索的双向垂度特征,并提出了2种主梁吊装过程的解析解.利用数值迭代法,实现不依赖于前行施工阶段,独立求解任一工况的物理状态.算例分析表明,该方法对施工状态的实时变动能迅速作出响应,适合施工过程的实时监控与技术决策分析.

Analysis Method for Hoisting Construction Process of Suspension Bridge With Spatial Cables

Based on the fabrication length of main cable and hangers and the installation location of cable clamps, the lower end force matrix of hanger was established, and independent equilibrium equations of temporary system were established for each construction stage. Multi segment two force bars considering gravity and multi stage spatial catenary were respectively employed to simulate bidirectional sag characteristics of spatial cables, and two analytical methods were proposed for construction processes during hoisting girder. The proposed methods can separately solve the physical effect of any construction stages, without depending on the effect of any previous stages. The example shows that the proposed methods can rapidly respond to the real time changes of construction state, and are very suitable for the real time monitoring of construction process and technical decision analysis.