摘要
由预制平行高强钢丝索股组成的主缆,不仅可以通过其自身弹性变形,而且可以通过其几何形状的改变来影响体系平衡,表现出大位移非线性力学特征。为了获得大跨度悬索桥成桥主缆的真实线形及其内力分布,基于有限单元法,从主缆的几何形状出发,推导了与主缆形状一致的位移场,然后通过对节点水平方向和竖直方向平衡方程解藕,推导出主缆线形与结构系统参数的关系,在此基础上,进一步推导了主缆内力与结构系统参数的关系。将计算理论编译成MATLAB程序,并应用于某大跨度悬索桥成桥主缆线形及其内力识别,主缆计算线形与实测结果吻合良好。采用本文方法计算的主缆内力分布与通用有限元相应的计算值比较相近,从而验证了本文方法能够较准确地识别出成桥主缆的线形及其内力分布,另外具有易编程实现的优点。
The flexible main cable is made of high strength steel wire prefabricated parallel cable shares. Its large displacement and nonlinear mechanical properties are shown by their own elastic deformation and its geometry changes affecting the system balance. To get the real main cable alignment and cable force distribution of long-span suspension bridge,based on the finite element method,the element stiffness matrix was deduced,whose displacement field was as same to the element alignment. In the proposed method,the horizontal and vertical direction equilibrium equations were uncoupled,and then the relationship between main cable alignment and the system parameters was obtained. The proposed method was compiled to MATLAB programs,and applied to one long-span suspension bridge. The calculated cable alignment by the proposed method and the measured value were in good agreement,and the cable force was close to the corresponding ANSYS value. So,the comparison results verify feasibility of the proposed method,which could provide useful method for long-term monitoring of long-span suspension bridges.
出处
《广东公路交通》
2015年第1期18-23,共6页
Guangdong Highway Communications
基金
国家自然科学基金资助项目(50978105)
广东省交通厅科技项目(2007-15)
关键词
悬索桥
主缆线形
内力分布
精确有限元
suspension bridge
main cable alignment
cable force distribution
exact finite element
