脉动风 谐波叠加 高层结构和高耸结构的顺风向的脉动效应

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脉动风 谐波叠加 高层结构和高耸结构的顺风向的脉动效应

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In recent years, there has been growing interest in the study of wind effects on high-rise structures, particularly with regard to the phenomenon known as "flutter". Flutter is a type of vibration caused by the interaction of wind with a structure's natural frequency. This interaction often leads to the development of chaotic, high-amplitude oscillations, which can cause significant damage to the structure if left unchecked.

One important aspect of flutter is the effect of wind turbulence on the structure. Turbulence can be caused by a variety of factors, including nearby buildings, terrain features, and atmospheric conditions. When wind flows over a structure, it can create a complex pattern of vortices and eddies, which can cause fluctuations in the wind pressure and velocity. These fluctuations can combine with the structure's natural frequency to produce a phenomenon known as "vortex-induced vibration", or VIV.

Another important consideration in the study of wind effects on structures is the role of harmonics. Harmonics are essentially multiple frequencies that combine to produce a more complex waveform. In the case of wind-induced vibrations, harmonics can arise when the wind speed and direction align with the natural frequency of the structure. When this happens, the resulting vibration can be much more severe than what would be expected from the wind alone, and can lead to catastrophic failure if not properly accounted for.

Overall, the study of wind effects on high-rise structures is an important area of research that has significant implications for the safety and stability of our built environment. By understanding the complex interplay between wind, structures, and natural frequencies, we can develop more effective design standards and construction practices that can ensure the longevity and resilience of our buildings and infrastructure.