考虑中间支撑的拉索等效索长计算方法  

Equivalent cable length calculation method considering influence of intermediate supports

作　　者：唐盛华[1] 方志[1] 

机构地区：[1]湖南大学土木工程学院,长沙410082

出　　处：《振动与冲击》2013年第7期82-87,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51078134)

摘　　要：针对减振器和阻尼器等中间支撑影响拉索振动频率,降低频率法计算索力精度问题,寻求考虑中间支撑影响的索力计算方法。基于拉索振动微分方程和能量原理,构造拉索等效索长计算公式。该方法可应用于各种基于固结边界的索力实用公式。与有限元方法分析结果比较表明,该方法计算精度良好、适用范围较广;计算简单,便于实际工程应用。The cable tension test with the frequency method is widely used in construction control, assessment and long-term monitoring of cable-supported structures. Due to existence of intermediate supports, such as, absorbers and dampers, the calculation precision of cable tension is reduced. In order to acquire a cable tension calculation method considering influence of intermediate supports, an equivalent cable length calculation method based on vibration differential equation of a cable and energy principle was proposed here. This method could be applied in many formulas for calculatating cable tension under a fixed-fixed boundary condition. The results from case studies demonstrated that the method can simulate the tension condition of cables with intermediate supports precisely; meanwhile, compared with the finite element method, the method of equivalent cable length calculation is not complex, it can be easily used in practical engineering.

关 键 词：频率法 索力测试 等效索长 减振器 阻尼器 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]