摘要
以金塘大桥为研究对象,基于弹簧悬挂系统,采用Starccm+软件为研究工具,利用微分方程的数值解法和动网格技术,研究不同风攻角下桥梁的颤振临界风速、涡振扭转和竖弯振幅。结果显示:风攻角为3°时颤振临界风速区间为81~83m/s,风攻角为0°时颤振临界风速区间为87~89m/s,风攻角为-3°时颤振临界风速区间为95~98m/s,而规范公式计算的弯扭耦合颤振临界风速为90.44m/s,均大于检验风速76.3m/s;金塘公铁两用大桥的竖向弯曲振动和扭转振动涡振的共振振幅分别为102mm和0.25386°,均小于规范的容许值201.3mm和0.2898°;主梁颤振及涡激振动性能满足要求。研究结果表明金塘公铁两用大桥设计抗风稳定性满足规范要求,研究方法对大跨度桥梁的抗风设计具有参考价值和实际意义。
Taking Jintang bridge as the research object,the critical wind speed of flutter and vorticity torsion and vertical deflection amplitude were studied under different wind attack angles by using the Starccm+ software,numerical simulation and dynamic grid technique,based on the spring suspension system.The results show that the rang of the critical wind speed of flutter is from 81 m/s to 83 m/s when the wind attack angle is 3°.The rang of the critical wind speed of flutter is from 87 m/s to 89 m/s when the wind attack angle is 0°.And the rang of the critical wind speed of flutter is from 95 m/s to 98 m/s when the wind attack angle is negative 3°.The critical wind speed of flutter calculated by the formula in the design specification is 90.44 m/s.They are all greater than the test wind speed which is 76.3 m/s.The resonance amplitude of vorticity torsion and vertical deflection are 102 mm and 0.253 86°,respectively.They are less than the allowable value of the design specification 201.3 mm and 0.289 8°.The flutter and vortex-induced vibration performance of the main beam meet the requirements.The research results indicate that the designed wind-resistant stability of Jintang bridge meets the code requirements.The research methods and results have a reference value and practical significance for the wind-resistant design of long-span bridges.
作者
郗艳红
柳润东
陈明杲
刘斌
毛军
XI Yanhong;LIU Rundong;CHEN Minggao;LIU Bin;MAO Jun(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)
出处
《中国科技论文》
CAS
北大核心
2019年第6期630-636,共7页
China Sciencepaper
基金
国家重点研发计划专项(2016YFC0802206)
国家自然科学基金资助项目(51578061)
高等学校博士学科点专项科研基金资助项目(20130009120024)
中央高校基本科研业务费专项资金资助项目(2019JBM087)
关键词
桥梁
颤振
临界速度
涡振
动网格
bridge
flutter
critical speed
vortex-induced vibration
dynamic mesh
