摘要
利用刚性模型测压试验,研究了施扰建筑高度比变化对主建筑层阻力系数和层脉动阻力功率谱的影响规律。试验包含了3个并列位置,5个串列位置和3个斜列位置。分析结果表明,建筑物并列时,当间距比小于3.0时,高度比为1.3时的层平均阻力系数在某些层可能比高度比1.0时增大高达20%,层脉动阻力系数在高度比为1.3且间距比小于3.0时会略大于单体建筑,其余情况与单体建筑一致;建筑物串列时,高度比对层平均阻力系数影响主要体现在遮挡效应上,高度比越大,遮挡效应越严重,遮挡高度越大,层脉动阻力系数由于遮挡效应减弱涡脱以及施扰建筑增加来流湍流共同作用,影响规律复杂,层脉动阻力功率谱的影响规律也表明了高度比越大影响高度越大;斜列工况的结果,表明了并列间距比对干扰规律起控制作用。
The effects of relative height of interfering building on main building layer＇s drag force coefficients and drag force power spectrum were studied with rigid model pressure tests considering 3 side by side positions,5 tandem positions and 3 oblique positions.The results showed that in side by side cases,the interfering building has little impact on the layer drag force coefficients and the drag force power spectrum;in tandem cases,the height ratio＇s impacts on the mean layer drag force coefficients are mainly incarnated in shielding effect,the greater the height ratio,the more serious the shielding effect and the higher the shielding height;the interference law of the RMS layer drag force coefficients is complex because of the combination of shilding effect and increase in flow turbulence;the interference law of drag force spectrum also reveals the shielding height of different height ratio is different;the results of three oblique cases reveal across-wind spacing ratio plays a leading role in interference laws.
出处
《振动与冲击》
EI
CSCD
北大核心
2016年第9期101-109,共9页
Journal of Vibration and Shock
基金
国家自然科学基金重大研究计划重点项目(90715040)
集成项目(91215302)资助
关键词
高层建筑
干扰效应
阻力
高度比
风洞试验
high-rise buildings
interference effect
drag force
relative height
wind tunnel test
