风敏感性高耸钢结构电视塔的风致效应研究
Study on Wind-Induced Effect of Wind Sensitive High-Rise Steel Structure TV Tower

高耸的钢结构电视塔，具有结构高度较高、结构刚度相对较小的特点，对于风荷载高度敏感。本文对钢结构电视塔采用缩尺比例的刚性模型，进行刚体模型群体建筑测压风洞试验，测定360度风向角下的电视塔模型表面的风压值，从而可以正确地计算出电视塔实物表面的平均风压值、脉动风压值、风荷载体型系数，确定最不利风向角以及沿电视塔高度变化的风振系数。根据试验进行结构风振响应分析，将刚体模型测压风洞试验获得的各测点脉动压力时程作用于结构动力分析有限元模型上对结构进行频域分析，确定其重要部位的风振位移和加速度响应以及各层的等效风荷载，为设计提供必要的和可靠的依据。
The high-rise steel structure TV tower has the characteristics of high structural height and relatively small structural stiffness and is highly sensitive to wind load. In this paper, the steel structure TV tower adopts the rigid model with reduced scale, carries out the pressure measurement wind tunnel test of rigid model group buildings, and measures the wind pressure value on the surface of the TV tower Model under 360？ wind angle, so that the average wind pressure value, fluctuating wind pressure value and wind load shape coefficient on the physical surface of the TV tower can be calculated correctly to determine the most unfavorable wind direction angle and the wind vibration coefficient varying along with the height of the TV tower. The wind-induced vibration response of the structure is analyzed according to the test. The fluctuating pressure-time history of each measuring point obtained from the wind tunnel test of the rigid body model is applied to the finite element model of structural dynamic analysis. The frequency-domain analysis of the structure is carried out to determine the wind-induced vibration displacement and acceleration response of its important parts and the equivalent wind load of each floor, so as to provide a necessary and reliable basis for the design.