Influence of Wind Speed ​​on Wind Vibration Fatigue Life of Structures
The wind speed has a certain distribution in space and changes with time. The general specification often only gives the basic wind speed or wind pressure. To analyze wind-induced vibration and fatigue life of a structure, this is obviously not enough, and the influence of combined wind speed and direction at the structural position needs to be considered. The most direct way to obtain the wind speed and direction joint distribution function at the structural location is to install the wind anemometer at the structural location and measure the meteorological data at the structural location for a long period of time. This method requires long-term preparatory work, in practice, This method is difficult to apply; another commonly used method is to obtain a joint distribution of wind speed and direction based on the meteorological data of weather stations near the structure, so as to perform structural wind-induced vibration fatigue life analysis. The wind speed mentioned in the article can be monitored by related instruments such as wind anemometer. In meteorological testing, we often need to determine parameters such as wind direction, wind speed, temperature, humidity, and carbon dioxide content to understand the environment. The wind speed in this paper is also part of meteorological testing. The wind direction wind speed monitor is used to determine Wind speed instrument. In addition, rainfall monitoring also has specific instruments such as self-reporting gauges. Rainfall monitoring is an adjunct to soil moisture determination because the direct source of soil moisture is rainfall.
In a specific example, we first perform statistical analysis on the meteorological data of two meteorological stations near the building structure, and obtain a joint distribution function of two different wind speeds and directions at the position of the building structure. Then I analyze the different wind speed and direction joint distribution function pairs. The main failure modes of wind-induced vibration in structural systems and the influence of wind-induced fatigue failure probabilities of structural systems are shown. The results show that the number of major failure modes identified by the combined wind-wind-wind-distribution function of the Nanhai Meteorological Station through wind-induced vibration fatigue is less than that of Guangzhou Weather Station. The number of major failure modes is identified by the wind speed and direction joint distribution function; the same failure components are identified by the two distribution functions in the first to third stages of the structural failure history; the antenna obtained from the combined wind speed and direction of the Guangzhou weather station The failure probability of the structural system's wind-induced vibration fatigue life is about 3.8%, and the result obtained from the wind speed and direction joint distribution function of the South China Sea weather station is about 3.0%. This shows that different wind speed and wind direction joint distribution function has a greater influence on the fatigue failure probability of structural systems in wind-induced vibration, and it also shows that the wind field parameters should be obtained as accurately as possible when analyzing wind-induced fatigue life of important structures.
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