论文部分内容阅读
基于刚性模型表面压力测量风洞试验,对一外附网架且外形复杂的高层建筑立面上典型测点的最不利风压系数进行研究,分析外附网架和复杂周边环境的影响。试验结果表明,高层建筑立面上的最不利正风压系数在风向近似正对测点时发生,最不利负风压系数通常在来流风向与测点所在面大致平行时发生;外附网架使得建筑绕流的分离点向下游方向移动,这种效应在大曲率曲面或是边缘有尖角的面上作用很微弱,而在小曲率曲面上的作用则很显著;复杂周边环境对目标建筑的遮挡效应十分明显,目标建筑在受干扰时的气动力谱中,分布在高频区段的能量高于未受干扰的情况,这可能导致结构风振响应的共振分量增大。
Based on the wind tunnel test of the rigid model surface pressure measurement, the most unfavorable wind pressure coefficient of a typical measuring point on a tall building with a grid attached and with a complicated appearance is studied, and the influence of the attached grid and the complicated surrounding environment is analyzed. The test results show that the most unfavorable positive wind pressure coefficient on the facade of high-rise buildings occurs when the wind direction is approximately opposite to the measuring point, and the most negative negative wind pressure coefficient usually occurs when the direction of the incoming flow and the measuring point lie approximately parallel. The frame moves the separation point around the building to the downstream direction. This effect is very weak on the surface with large curvature or the surface with sharp corners, while the effect on the small curvature surface is very significant. Obstruction effect of buildings is very obvious. In the aerodynamic spectrum of the target building when disturbed, the energy distributed in the high-frequency section is higher than undisturbed, which may lead to the increase of the resonance component of wind-induced vibration response.