摘要
基于刚性模型测压风洞试验,研究了方形高层建筑在单体和受扰状态下的脉动风压功率谱特性。在风洞中首先对C类地貌下的单体方形高层建筑进行了实验,然后针对16个不同施扰位置、3种不同高度比时的两方形高层建筑进行了干扰实验,得到了受扰方形高层建筑的局部风压。基于实验结果,研究了串列布置条件下间距比以及高度比对受扰建筑典型测点风压谱的影响。结果显示,单体建筑迎风面中轴线测点风压谱为宽频分布而棱边处风压谱出现尖锐谱峰;侧风面后缘高频段能量显著大于前缘。串列布置间距比变化时,典型测点谱峰幅值在间距比较小时显著削弱。较低施扰建筑导致的低频段能量较大,而较高施扰建筑主要影响高频段能量。
Based on wind tunnel tests of two square tall buildings,the characteristics of their wind pressure spectra under isolated and interfered states were investigated.Firstly,tests for a single square tall building on C type of terrain were performed,then interfering tests for two square tall buildings with 16 different interfering locations and 3 different height ratios were conducted and the local wind pressures of the interfered buildings were obtained.Based on test results, the effects of different spacing ratios and height ratios in tandem configurations on the wind pressure spectra of the typical of the interfered buildings were analyzed in frequency domain.The results showed that wind pressure spectra energy on the center line of the windward face of the isolated building distributes over a wide frequency range;however,that on the edges of the face has sharp peaks;energy within a higher frequency range on the trai points edges of the side face of the isolated building is significantly greater than that on the front edges;the sharp peak amplitudes weakens with decrease in spacing ratio in tandem arrangements;the lower interfering building leads to larger energy within a lower frequency range, while the taller interfering building mainly affects energy within a higher frequency range.
出处
《振动与冲击》
EI
CSCD
北大核心
2014年第7期31-36,共6页
Journal of Vibration and Shock
基金
国家自然科学基金项目(90715040)
关键词
超高层建筑
风压谱
干扰效应
间距比
高度比
super-high-rise building
wind pressure spectra
interference effects
spacing ratio
height ratio
