摘要
基于滑移理论推导出三维节段斜拉索气动升力的计算公式;考虑水线运动、气流变化和拉索振动之间的相互影响,将三维水膜运动方程与单自由度振动理论相结合建立双向耦合的三维风雨激振数学模型,研究三维刚性节段斜拉索表面水膜形态变化规律、拉索升力及其振动规律。结果表明:应用三维滑移理论模型数值模拟得到的拉索表面上下水线的位置、形态、厚度及环向振荡范围均与实验结果相近;上水线的环向周期性运动导致拉索升力周期性变化,二者步调一致且频率相同,均接近拉索自振频率,引发拉索大幅度自激振动。
Here,the calculation formula for aerodynamic lift force of 3-D segmental stayed cable was derived based on the slip theory.Considering mutual interactions among waterline motion,airflow variation and cable vibration,combining the 3-D water film motion equation and the single-DOF vibration theory,the 3-D mathematic model for bi-directional coupling between waterline motion and cable’s rain-wind induced vibration was established to study morphological change law of water film on surface of a 3-D cable segment,and variation laws of cable lift force and vibration.The results showed that position,morphology,thickness and circumferential oscillatory range of upper and lower waterlines obtained with the 3-D model’s numerical simulation and the slip theory are all close to test results;circumferential periodic motion of upper waterline causes periodic variation of cable lift force with the same pace and the same frequency,this frequency is close to cable’s natural frequency to cause cable’s large amplitude self-excited vibration.
作者
王剑
毕继红
逯鹏
关健
乔浩玥
周燕
郭红梅
WANG Jian;BI Jihong;LU Peng;GUAN Jian;QIAO Haoyue;ZHOU Yan;GUO Hongmei(Key Laboratory of Soft Soil Characteristic and Engineering Environment of Tianjin,Tianjin Chengjian University,Tianjin 300384,China;School of Civil Engineering,Tianjin University,Tianjin 300072,China;Central Research Institute of Building and Construction Co.,Ltd.,MCC,Beijing 100008,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2020年第3期8-15,23,共9页
Journal of Vibration and Shock
基金
国家重点研发计划(2016YFC0701204)
国家自然科学基金(51408399)
天津市自然科学基金(18JCYBJC90800)
天津市应用基础与前沿技术研究计划(15JCYBJC48800
17JCYBJC22300
18JCQNJC08300)
道路结构与材料交通行业重点实验室基金项目(310821171114)
天津市企业博士后创新项目择优资助计划(2015-003)
天津城建大学科技成果转化奖励资助项目(KJZH-CA3-1744,KJZH-CB8-1724)
关键词
风雨激振
斜拉索
滑移理论
三维数值模拟
水线
rain-wind induced vibration
stayed cable
slip theory
3-D numerical simulation
waterline
