The wind field environment in mountainous zones is complex. If the wind field characteristics are regarded as stationary and Gaussian, the inaccurate response results of the structure will be obtained. In this paper, a fatigue evaluation method of steel truss suspension bridge members under non-stationary and non-Gaussian buffeting is proposed. This approach can solve the fatigue evaluation problem of steel truss suspension bridge members under mountain wind. Firstly, the normal wind speed (stationary and Gaussian) is obtained by the harmonic wave synthesis method. The wind speed considering non-stationary characteristics is obtained by adopting time-varying power spectrum. Secondly, through non-linear translation, the wind speed considering non-stationary characteristics is transformed into wind speed considering both non-Gaussian and non-stationary characteristics. Finally, combined with the Palmgren–Miner rule, the effects of three different buffeting responses on fatigue damage of suspension bridge members are studied. They are traditional buffeting response, buffeting response considering non-stationary characteristics and buffeting response considering both non-stationary and non-Gaussian characteristics. The results indicate that the fatigue damage of the main cable of the suspension bridge is the biggest at the mid-span. Under the same wind speed, considering two characteristics, the component fatigue damage will further increase.

山区风场环境复杂。如果将风场特性视为平稳且高斯分布，则会得到不准确的结构响应结果。提出了一种非平稳非高斯抖振下钢桁架悬索桥构件的疲劳评估方法。该方法可以解决山风作用下钢桁架悬索桥构件的疲劳评估问题。首先，通过谐波合成方法获得法向风速（静止风速和高斯风速）。采用时变功率谱得到考虑非平稳特性的风速。其次，通过非线性平移，将考虑非平稳特性的风速转化为同时考虑非高斯和非平稳特性的风速。最后，结合Palmgren-Miner法则，研究了三种不同抖振响应对悬索桥构件疲劳损伤的影响。它们是传统的抖振响应、考虑非平稳特性的抖振响应和同时考虑非平稳和非高斯特性的抖振响应。结果表明，悬索桥主缆疲劳损伤在跨中处最大。相同风速下，考虑两个特性，构件疲劳损伤会进一步增加。