振动频率法测试具有橡胶阻尼器的斜拉索索力的修正方法  

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

作　　者：李永鑫 李林安[1] 张凤鑫 王雨权 林鸿洸 周俊龙 LI Yongxin;LI Lin’an;ZHANG Fengxin;WANG Yuquan;LIN Hongguang;ZHOU Junlong(School of Mechanical Engineering,Tianjin University,Tianjin 300354,China;Architectural Design&Planning Research Institute Corporation,Tianjin University,Tianjin 300073,China;China Railway Design Corporation,Tianjin 300308,China;China Construction Sixth Engineering Corporation,Tianjin 300012,China)

机构地区：[1]天津大学机械工程学院,天津300354 [2]天津大学建筑设计规划研究总院有限公司,天津300073 [3]中国铁路设计集团有限公司,天津300308 [4]中国建筑第六工程局有限公司,天津300012

出　　处：《振动与冲击》2024年第16期18-25,共8页Journal of Vibration and Shock

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。该研究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;结合虚拟算例对该研究结果的精确度进行分析,并在工程中应用。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 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3