对悬索桥对称竖弯基频近似公式的修正

Modification of Primacy Frequencies Approximation Calculation of Suspension Bridge

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 ,并通过对 5座悬索桥算例的计算 ,把用本文导出的公式、计算出的结果和精确的有限元解相比较。

In this thesis, the infection of side cable and pylon stiffness to approximate symmetrically natural vertical frequencies of suspension bridges is compendious evaluated and reviewed by using the finite element approach through three suspenson bridge examples. Using energy principles, the symmetrically natural vertical frequency of single span suspension bridges taking into account the affection of side cable, tower-elasticity and factual vibration shape in mended. Five detailed single span numerical examples of suspension bridges, the accuracy of the analysis is examined by a comparative computed by means of between the formulas and the finite element approach. They can be used in process of project choosing and initial design.