摘要
分析了边缆和桥塔刚度对悬索桥对称振动基频的影响 ,然后基于能量原理 ,在分别考虑了边缆和桥塔刚度的影响以及悬索桥自由振动实际振型的情况下 ,用Rayleigh Ritz法对悬索桥一阶竖向挠曲自由振动频率近似计算公式作了进一步的改进 ,用以对五座悬索桥算例的计算 ,计算结果和精确的有限元解非常接近 。
A simplified formula of symmetric?vertical natural frequency for suspension bridges is derived in the paper.The pylon stiffness is not to be considered.The results of formula are small than that of the finite element method.We consider the effects of the side?cable and pylon stiffness and real vibration modes.A modification on simplified formula is proposed in the paper.It is based on the Rayleigh?Ritz method.Five suspension bridges are selected as numerical examples.The results of modification are much agreed with that of the finite element method.The requirements of the schematic design and preliminary design are satisfied.
出处
《土木工程学报》
EI
CSCD
北大核心
2002年第1期44-49,共6页
China Civil Engineering Journal
关键词
悬索桥
自由振动
基频
近似计算
Suspension bridge, free vibration, natural freguency, approximation calcutation
