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How to consider the high-rise wind-shock coefficient as a pure-cut 33-story house, the basic wind pressure value is 0.88, C-type environment.
In the trial calculation process, it is found that if the influence of wind-induced vibration coefficient is considered, the Y-direction wind-load displacement cannot be exceeded, and the maximum displacement angle is 1/729. When not considered, the displacement angle is 1/1024.
7.4.1 in the load specification: When the basic period of the structure is greater than 0.25, the wind vibration coefficient should be considered.
For this type of structure, the wind vibration coefficient must be considered. Calculate the structural bearing capacity according to the 100-year wind pressure recurrence value, and calculate the horizontal displacement of the structure according to the 50-year wind pressure recurrence value. The pure shear structure has the interlayer displacement when the harmful displacement value is less than 50% of the interlayer displacement value. The angular limit can be relaxed to 1/800.
What is the physical meaning of the wind vibration coefficient?
One is the average wind pressure plus the equivalent wind pressure caused by the pulsating wind to cause structural wind vibration; the other is the average wind pressure multiplied by the wind vibration coefficient. In the calculation of wind-induced vibration of the structure, it is often the first mode that plays a major role. Therefore, China is the same as most countries, and the latter expression is adopted, that is, the wind-induced vibration coefficient is adopted.
Wind vibration coefficient and gust coefficient
The wind load on the structure can be divided into two components: average wind and pulsating wind. Correspondingly, the effect of the wind on the structure also has a static average wind action and a dynamic pulsating wind effect. The effect of the average wind can be calculated by the static method, while the pulsating wind is a random load, which causes the vibration of the structure. The vibration is generally analyzed by random vibration theory.
The wind vibration coefficient refers to the ratio of the total response of the structure to the structural response caused by the average wind pressure.
The gust factor is a factor that takes into account the fact that the instantaneous wind is larger than the average wind, and is generally the ratio between the gust wind speed and the average wind speed at a time interval of 10 minutes.
Wind-induced vibration coefficients are generally considered in structures with large wind loads. The specific values ​​can only be referred to related similar projects in the past. For roof structures (such as large-span grandstands), they should not be considered as "enclosure structures" and only gust factors should be considered.
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