非平稳台风-桥分析系统

 从风场模拟、验证和荷载处理3个方面考虑台风非平稳特性，构建了台风-桥分析系统。构建了台风风场模拟验证系统方法，基于非平稳风速模拟方法建立台风风场模拟方法，并引入非均匀调制进化谱对模拟风场进行验证；基于良态风荷载处理方法，建立了台风荷载处理方法，并采用APDL语言进行ANSYS二次开发，建立台风-桥时域分析系统；采用建立的分析系统对台风作用下某斜拉桥桥梁响应进行分析。结果表明，模拟功率谱和验证进化谱吻合良好，提出的台风风场模拟和验证系统方法合理有效；模拟台风风速与台风作用下的桥梁响应时程曲线均与时变平均风速变化趋势相同，且波动幅度随时变平均风速的减小而减小；基于平稳特性经典风谱直接对台风风场进行模拟不合适。

An analytical system for nonstationary typhoon-bridge

The non-stationary characteristics of typhoon are considered in three aspects as wind field simulation, validation and load treatment, and a typhoon-bridge analysis system is established. Firstly, the simulation and validation method for typhoon field is proposed, in which the simulation is based on the non-stationary wind speed simulation method and the validation is fulfilled by introducing the nonuniform modulation evolution spectrum. Secondly, the typhoon load treatment method is established by means of the treatment method for normal wind. APDL language is used to develop the ANSYS into a time domain wind-vehicle analysis system. Finally, the response of a cable-stayed bridge is analyzed by the developed analysis system. The results show that the simulated power spectrum agrees well with the validated evolution spectrum, and that the simulation and validation method is rational and effective. It is also shown that the time history curves of bridge response under typhoon and the simulated typhoon wind speed have the same trend as the time-varying mean wind speed, and the fluctuation amplitude decreases with the decrease of the mean wind speed. The classical wind spectrum based on stationary characteristics is not suitable for typhoon simulation.