摘要
频率法检测索力是桥梁健康检测的一种常用方法。考虑了短粗拉索的抗弯刚度,利用牛顿迭代法对边界条件为两端固定拉索的自由振动进行分析,建立由频率识别拉索索力的近似公式。并利用有限元法分析得到的拉索的自振频率,对近似公式和相关文献的解进行对比研究。结果表明,近似公式精度较高,对短粗索索力识别的相对误差在1%以内。
The vibration method is often used to determine cable force in bridge health monitoring.Firstly,the free vibration of clamped-clamped cable which considers flexural rigidity is analyzed by Newton iteration method in this paper.Then,the approximate formulas which are used to identify cable force by frequencies are constructed.Finally,by comparing with the proposed formulas and the theories of the related literatures with frequencies obtained by the finite element method,it is shown that the proposed formulas have a higher accuracy and the tension force is determined with a relative error of within 1%.
出处
《工业建筑》
CSCD
北大核心
2011年第S1期258-260,334,共4页
Industrial Construction
基金
北京市科学技术委员会项目资助(Z08050602940803)
关键词
频率法
抗弯刚度
索力
近似公式
有限元法
frequency method
flexural rigidity
cable force
approximate formulas
finite element method
