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高层建筑横风向风振响应和等效静风荷载备受风工程和结构工程领域的关注。横风向风荷载产生机理复杂,一般认为主要来源于紊流、尾流及旋涡脱落和气动阻尼。横风向风振主要是旋涡脱落下的涡激振动,各国规范大都规定圆柱体横风向涡激振动是确定性振动,非圆截面要依据风洞试验确定。该文综合众多试验研究,提出了在准定常理论不适用情况下的随机振动分析方法,建立了超高层建筑的横风向等效静风荷载的计算模型。引入横风力谱,考虑气动阻尼,对某矩形截面建筑进行了等效静风荷载分析,并对相关参数进行了分析。分析结果表明,按随机振动理论建立计算模型是可行的,当计算横风向风振响应时,应适当考虑正气动阻尼的影响,使计算结果更具真实性。
The wind-induced response and the equivalent static wind load of high-rise buildings in the wind direction have received much attention in the field of wind engineering and structural engineering. Crosswind wind load complex mechanism is generally believed that the main source of turbulence, wake and vortex shedding and aerodynamic damping. Vibration is mainly vortex shedding vortex induced vibration vortex shedding, most of the normative provisions of the cylinder vortex-induced vibration of the cylinder is a deterministic vibration, non-circular cross-section to be based on wind tunnel test to determine. Based on a large number of experimental studies, this paper presents a stochastic vibration analysis method in the case that quasi-stationary theory is not applicable, and establishes a computational model of transverse wind equivalent static wind load of super high-rise buildings. The introduction of transverse wind spectrum, consider the aerodynamic damping, the equivalent static wind load analysis of a rectangular section of the building, and the relevant parameters were analyzed. The results show that it is feasible to set up the calculation model based on stochastic vibration theory. When calculating the wind-induced response of transverse wind direction, the influence of positive aerodynamic damping should be properly considered to make the calculation result more realistic.