摘要
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 surface pressure measurement wind tunnel test of rigid model,the most unfavorable pressure coefficient of the typical measurement point of the high-rise building facade with complex shape and attached grids was studied,and the effects of attached grids and complex surroundings were analyzed. The test results show that the most unfavorable positive wind pressure coefficient in high-rise building facade exists when the wind direction approximate faces the measured point,and the most unfavorable negative pressure coefficient usually occurs when the wind direction is parallel to the plane of measuring point. Attached grids make the separation point of round flow of the building move towards the downstream direction,whose effect is very weak in the large curvature surface or in the surface with sharp corners while the effect is very significant in the small curvature surface. Shielding effect of complex surroundings on the target architecture is very obvious. In the aerodynamic spectrum of target interfered architecture,energy distributed in high frequency section is higher than that of the undisturbed architecture,which may cause the resonance component of the wind vibration response of the structure to increase.
出处
《建筑结构》
CSCD
北大核心
2015年第2期75-79,共5页
Building Structure
基金
国家自然科学基金项目(50878159
90715040)
上海市浦江人才计划项目(08PJ1409500)
土木工程防灾国家重点实验室自主课题(SLDRCE10-B_03)
关键词
高层建筑
风洞试验
复杂周边环境
外附网架
high-rise building
wind tunnel test
complex surrounding
attached grid
