论文部分内容阅读
基于传统的统一描述方法,提出了一种改进的主梁气动力时域列式方法。该法通过校准方式引入修正系数以考虑主梁气动导数对自激效应的影响,通过引入气动导纳函数修正紊流风谱以考虑气动力沿主梁截面尺度的不完全相关性,从而在一定程度上突破了准定常假定的限制,克服了直接采用准定常假定而不加以修正所带来的问题。相对于列式复杂的主梁气动力非统一描述方法,该法仍保留了列式简单直观、物理意义明确的优点。采用所提出的方法对一独特的三塔大跨度斜拉桥进行了抖振响应分析,计算结果与风洞试验结果较为吻合,验证了该文方法的正确性和实用性。
Based on the traditional uniform description method, an improved main beam aerodynamic time-domain method is proposed. In this method, the correction coefficient is introduced through calibration to consider the influence of the main beam aerodynamic derivatives on the self-excitation effect. The aerodynamic admittance function is introduced to modify the turbulence wind spectrum to consider the incomplete correlation of the aerodynamic forces along the cross-section of the main beam, Broke through the quasi-fixed limits and overcame the problems posed by the direct adoption of quasi-constant assumptions without amendment. Compared with the non-uniform aerodynamic description of in-line complicated girders, this method retains the advantages of simple and intuitive formulas and clear physical meaning. The proposed method is used to analyze the chattering response of a unique three-tower long-span cable-stayed bridge. The calculated results are in good agreement with the wind tunnel test results, which proves the correctness and practicability of the proposed method.