应用拉索频率方程修正数值解的索力识别方法

发布时间：2018-02-04 20:57

本文关键词： 拉索索力频率方程数值法　出处：《振动.测试与诊断》2014年02期 　论文类型：期刊论文

【摘要】：精确测量拉索索力是进行斜拉桥健康监测和工作状态评估的关键。在不考虑垂度、刚度、边界条件等因素的影响的条件下应用振动频率显式公式法识别实际工程中的拉索索力,会造成相当程度的误差。首先,通过对考虑上述条件时的隐式拉索频率方程零根的数值求解,给出了索力和频率的间接计算方法;其次,通过数值仿真,研究了该方法对索振动频率和索力识别误差的规律;最后,在此基础上建立了进一步的经验误差修正公式。实例研究表明,与其他显式公式方法相比,基于频率方程数值解的方法显著提高了识别精度,在此基础上进行的经验误差修正,可进一步大幅提高索力索频的识别精度;与有限元模型修正法相比,建议的方法计算耗时更小。
[Abstract]:Accurate measurement of cable force is the key to health monitoring and working condition evaluation of cable-stayed bridges. Under the influence of boundary conditions and other factors, using the explicit formula method of vibration frequency to identify the cable force in practical engineering will cause considerable errors. The indirect calculation method of cable force and frequency is given by solving the zero root of the implicit cable frequency equation considering the above conditions. Secondly, through numerical simulation, the law of the error of cable vibration frequency and cable force identification is studied. Finally, a further empirical error correction formula is established. The results show that the method based on the numerical solution of the frequency equation improves the recognition accuracy significantly compared with other explicit formula methods. The empirical error correction based on this method can further improve the recognition accuracy of cable cable frequency. Compared with the finite element model modification method, the proposed method takes less time to calculate.
【作者单位】：同济大学桥梁工程系;河南省交通规划勘察设计院有限责任公司;
【基金】：国家自然科学基金资助项目(50978196) 国家重点实验室自主资助项目(SLDRCE09-D-01) “十二五”国家科技支撑计划课题资助项目(2012BAJ11B01) 中央高校基本科研业务费专项资金和国家气象局气象行业科研专项经费资助项目(201306102)
【分类号】：U448.27;U446
【正文快照】： 引言拉索索力对斜拉桥整体结构的受力和变形都有较大的影响,是进行此类桥梁健康监测和工作状态评估的重要依据,需要对其进行精确测量。基于环境振动的频率公式法是目前斜拉桥上常用的索力测量方法[1-2]。当考虑拉索的垂度、抗弯刚度、边界条件等实际因素时,索力索频之间的显

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