摘要
为方便计算自锚式悬索桥的竖向自振频率,以双塔自锚式悬索桥为研究对象,在考虑主塔刚度的影响下,应用Rayleigh法,推导了一阶对称和反对称竖弯振动频率公式,提出了主塔刚度影响系数的表达式,并对公式的可行性和适用范围进行了算例验证和讨论.研究结果表明:主塔刚度对双塔自锚式悬索桥的一阶正对称竖弯频率影响较大,对该频率进行计算时,应计入主塔刚度的影响;主塔对竖弯基频的影响程度可通过主塔刚度影响系数计算得到;由该法得到的竖弯基频计算值与有限元值误差能满足概念设计阶段的要求;该公式可用于双塔自锚式悬索桥竖弯基频的计算.
To calculate the vertical frequency of self-anchored suspension bridge conveniently,the selfanchored suspension bridge with double-tower was taken as research object. Frequency formulas for first symmetric and asymmetric vertical vibration modes were induced by Rayleigh method,and the influence coefficient for tower stiffness was proposed. The presented theoretical formulas were validated by engineering project,and the application condition was discussed. The results indicate that tower stiffness has great influence on first symmetric vertical frequency, which should be correctly considered in frequency calculation. The error between values calculated by the proposed formula and the finite element method can meet the requirement of conceptual design. The proposed formulas can be applied into the self-anchored suspension bridge with double-tower.
出处
《江苏大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第3期355-360,共6页
Journal of Jiangsu University：Natural Science Edition
基金
国家自然科学基金资助项目(50908017)
中央高校基本科研业务费专项资金资助项目(201493212002)
云南省交通厅科技计划项目(2013(A)02)
关键词
双塔自锚式悬索桥
桥梁工程
竖弯频率
Rayleigh法
主塔刚度
self-anchored suspension bridge with double- tower
bridge engineering
vertical frequency
Rayleigh method
tower stiffness
