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方形断面是土木工程领域高层、高耸结构最常用的断面形状之一,横风向涡激共振是影响该类结构安全的重要因素。通过刚性节段模型测压试验,研究了方形断面结构气动力特性、旋涡脱落频率随风向角的变化规律,得到了该类结构发生涡激共振时的风速。研究结果表明:风向角影响其旋涡脱落频率,从而影响其涡激共振发生风速。当风向与方形断面迎风向夹角为74°左右时,方形断面发生横风向涡激共振的临界风速最低。
The square cross section is one of the most commonly used sectional shapes of high-rise and high-rise structures in the field of civil engineering. The cross-wind vortex-induced vibration is an important factor affecting the safety of such structures. The aerodynamic characteristics of the square cross-section structure and the change law of the vortex shedding frequency with the wind direction angle were studied by the rigid segment model pressure measurement test. The wind speed of the structure with vortex-induced resonance was obtained. The results show that the wind direction angle affects the frequency of vortex shedding, which affects the wind speed of vortex induced vibration. When the angle between the wind direction and the square cross-section windward is about 74 °, the critical wind speed of cross-wind vortex-induced vibration of the square section is the lowest.