振动频率法测具有橡胶阻尼器的斜拉索索力的修正方法

李永鑫1, 李林安1, 张凤鑫2, 王雨权3, 林鸿洸3, 周俊龙4

振动与冲击 ›› 2024, Vol. 43 ›› Issue (16) : 18-25.

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (16) : 18-25.
论文

振动频率法测具有橡胶阻尼器的斜拉索索力的修正方法

  • 李永鑫1,李林安1,张凤鑫2,王雨权3,林鸿洸3,周俊龙4
作者信息 +

A correction method for measuring cable tension in stay cables with rubber dampers using a vibration frequency method

  • LI Yongxin1,LI Lin’an1,ZHANG Fengxin2,WANG Yuquan3,LIN Hongguang3,ZHOU Junlong4
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文章历史 +

摘要

振动频率法是用于测试斜拉桥拉索索力的常用方法,斜拉桥为减弱振动引起的拉索疲劳损伤,通常在斜拉索两端安装阻尼器,这会改变索的结构和振动频率,从而导致在用振动频率法测试拉索索力值时会产生较大误差,难以满足桥梁施工和维护对精确度的要求,因此减小索力测量的误差对实际工程具有重要意义。本文将橡胶阻尼器简化为弹性支撑,基于变截面拉压杆模型推导了弹性支撑的等效刚度系数;基于具有两个弹性支撑的拉索横向自由振动微分方程,结合边界条件求解索力,给出了考虑橡胶阻尼器影响的振动频率测索力的修正方法;结合虚拟算例对本研究结果的精确度进行分析,并在工程中应用。

Abstract

The vibration frequency method is a common approach used to test the tension in inclined cable stays of cable-stayed bridges. To mitigate the fatigue damage caused by cable vibration, rubber dampers are often installed at both ends of the inclined cables. However, the presence of these dampers alters the structural characteristics and vibration frequencies of the cables. As a result, significant errors can occur when measuring cable tension using the vibration frequency method, making it challenging to meet the accuracy requirements for bridge construction and maintenance. Therefore, reducing measurement errors in cable tension is of vital importance for practical engineering applications. This study simplifies rubber dampers as elastic supports and derives the equivalent stiffness coefficients for these elastic supports based on a variable cross-section beam model. Based on the differential equation for the transverse free vibration of a rope with two elastic supports and incorporating boundary conditions, the solution for the tension force is obtained. A modified method for measuring the tension force while considering the influence of rubber dampers on vibration frequency is provided. The accuracy of the research results is analyzed through virtual simulations and applied in engineering practice.

关键词

振动频率法 / 修正模型 / 橡胶阻尼器 / 索力测试

Key words

Vibration Frequency Method / Correction Model / Rubber Dampers / Cable Tension Testing

引用本文

导出引用
李永鑫1, 李林安1, 张凤鑫2, 王雨权3, 林鸿洸3, 周俊龙4. 振动频率法测具有橡胶阻尼器的斜拉索索力的修正方法[J]. 振动与冲击, 2024, 43(16): 18-25
LI Yongxin1, LI Lin’an1, ZHANG Fengxin2, WANG Yuquan3, LIN Hongguang3, ZHOU Junlong4. A correction method for measuring cable tension in stay cables with rubber dampers using a vibration frequency method[J]. Journal of Vibration and Shock, 2024, 43(16): 18-25

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