摘要
文中基于Euler-Bernoulli梁理论,考虑了环境温差和抗弯刚度的影响,建立了温差时吊杆自由振动方程,给出吊杆索力与横向振动频率、温差变化之间的理论关系式,并采用工程实例进行验证。通过建立有限元模型分析降温前后索力的变化,并与实测数据对比得到吊杆索力与温度变化的相关性。结果显示温差对长吊杆的影响相对大于短吊杆,升温时索力增大,降温时索力减小。温度变化影响不可忽略,可为系杆拱桥吊杆设计和施工提供参考,延长吊杆的使用寿命。
Considering the influence of environmental temperature difference and bending stiffness,the free vibration equation of suspender under temperature difference is established with Euler-Bernoulli beam theory.The theoretical relationship among suspender cable force,transverse vibration frequency,and temperature difference is given,which is verified by engineering examples.The change of cable force before and after cooling was analyzed by establishing a finite element model,and the correlation between cable force and temperature change was obtained by comparing with the measured data.The results show that the influence of temperature difference on long suspenders is relatively greater than that on short suspenders.The cable force increases when the temperature rises,and decreases when the temperature drops.The influence of temperature change cannot be ignored,which may provide the reference for the design and construction of tied arch bridge suspenders with extending the service life of suspenders.
作者
张枢文
ZHANG Shuwen(Shanghai Urban Operation(Group)Co.,Ltd.,Shanghai 200023,China)
出处
《低温建筑技术》
2022年第3期132-135,共4页
Low Temperature Architecture Technology
基金
上海市道路运输局“城市基础设施(越江大桥)全生命周期运营管理关键技术及应用研究”(JT2021-KY-013)。
关键词
吊杆
温差
索力
频率法
suspender
temperature variation
Internal force of cable
frequency method
