山地超高层建筑风致响应研究

李正良;魏奇科;黄汉杰;孙 毅

振动与冲击 ›› 2011, Vol. 30 ›› Issue (5) : 43-48.

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PDF(1739 KB)
振动与冲击 ›› 2011, Vol. 30 ›› Issue (5) : 43-48.
论文

山地超高层建筑风致响应研究

  • 李正良1;魏奇科1;黄汉杰2;孙 毅1

作者信息 +

Research On Response of Super Tall Buildings In Hilly Terrain

  • LI Zheng-liang1;WEI Qi-ke1; HUANG Han-jie2; SUN Yi1

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文章历史 +

摘要


摘 要:风在山地地形的干扰下,其幅值和空间分布规律相对平地均会1.重庆大学土木工程学院,重庆 400045;
2. 中国空气动力研究与发展中心低速空气动力研究所,四川 绵阳 621000发生较大改变,尤其是山顶处风速有明显增大。如果不考虑山地的影响,仍然用平地边界层风场进行高层建筑维护结构和整体结构计算将偏于不安全。以前对山地风场的研究多限于平均风的变化,而对于脉动风的湍流特征和频域特性较少提及,且缺少山地与平地风场中超高层建筑风致响应计算的对比。本文建立了钟形、高斯形、余弦型几种轴对称三维山体模型,通过数值计算得到了不同山体坡度下山顶平均风加速比。计算结果显示,山顶平均风有较大的增大效应,最大加速比可达1.7,且反函数拟合结果与模拟结果更加吻合。通过与风洞试验结果的对比可见,平均风的数值模拟有较高准确性,湍流与试验相比还有一定差别。通过某超高层建筑的风振响应分析表明,山地风的增大效应对超高层建筑整体响应计算不可忽略,位移响应增大比例最大可达20%。

Abstract

Abstract: Considerable changes of the amplitude and the spatial distribution of wind velocity take place under the interfering of hilly terrain. Wind load and response of super tall buildings at special location in hilly terrain is significantly different from that in flat terrain, therefore the current method of calculating wind-induced response of the super tall buildings in flat terrain may be unsafe under the condition of the hilly terrain. Previous researches were mainly focused on mean wind speed-up effect, and very few researches on the turbulent characteristic were referred to this subject. Besides, there is no comparison between the result of wind reduced response of super tall buildings in hilly terrain and that in flat terrain. In this paper, several kinds of 3D hill model, including bell, Gaussian and cosine shaped, are established by CFD software Fluent. Vertical profiles of mean velocity at crest are calculated under different hill slopes. According to the result of the numerical simulation, the great speed-up effect is found at the crest and the maximum speed-up ratio reach 1.7. The result of the numerical simulation is fitted by the inverse function very good. Compared to the experiment data, the simulation of the mean velocity is accurate, but the turbulence of the numerical simulation has a certain gap. Through a numerical example of the wind-induced response of a super-tall building, the effect of the hilly terrain can’t be ignored, and the displacement response of the super-tall building in hilly terrain increase 20% compared to in flat terrain.

关键词

山地风场 / CFD / 风洞试验 / 超高层建筑 / 风致响应

Key words

Hilly terrain wind field / CFD / Wind tunnel test / Super tall buildings / Wind-induced response

引用本文

导出引用
李正良;魏奇科;黄汉杰;孙 毅. 山地超高层建筑风致响应研究[J]. 振动与冲击, 2011, 30(5): 43-48
LI Zheng-liang;WEI Qi-ke;HUANG Han-jie;SUN Yi. Research On Response of Super Tall Buildings In Hilly Terrain[J]. Journal of Vibration and Shock, 2011, 30(5): 43-48

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