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不同长宽比矩形高层建筑的分离再附流动特性

曾加东 李明水 张志田 曹宝珠

曾加东, 李明水, 张志田, 曹宝珠. 不同长宽比矩形高层建筑的分离再附流动特性[J]. 西南交通大学学报, 2020, 55(4): 780-788. doi: 10.3969/j.issn.0258-2724.20190259
引用本文: 曾加东, 李明水, 张志田, 曹宝珠. 不同长宽比矩形高层建筑的分离再附流动特性[J]. 西南交通大学学报, 2020, 55(4): 780-788. doi: 10.3969/j.issn.0258-2724.20190259
ZENG Jiadong, LI Mingshui, ZHANG Zhitian, CAO Baozhu. Separation-Reattachment Flows Characteristics of Rectangular High-Rise Buildings with Different Side Ratios[J]. Journal of Southwest Jiaotong University, 2020, 55(4): 780-788. doi: 10.3969/j.issn.0258-2724.20190259
Citation: ZENG Jiadong, LI Mingshui, ZHANG Zhitian, CAO Baozhu. Separation-Reattachment Flows Characteristics of Rectangular High-Rise Buildings with Different Side Ratios[J]. Journal of Southwest Jiaotong University, 2020, 55(4): 780-788. doi: 10.3969/j.issn.0258-2724.20190259

不同长宽比矩形高层建筑的分离再附流动特性

doi: 10.3969/j.issn.0258-2724.20190259
基金项目: 海南省自然科学基金项目(519QN191);国家自然科学基金资助项目(5193801);海南省重大科技研发资助项目(ZDKJ201803)
详细信息
    作者简介:

    曾加东(1987—),男,讲师,研究方向为建筑结构及桥梁抗风,E-mail:zjd_rcwe@126.com

    通讯作者:

    李明水(1966—),男,教授,研究方向为建筑结构及桥梁抗风,E-mail:lms_rcwe@126.com

  • 中图分类号: TU973.213

Separation-Reattachment Flows Characteristics of Rectangular High-Rise Buildings with Different Side Ratios

  • 摘要: 为研究边界层紊流特性、断面长宽比和空间位置等因素与矩形高层建筑分离再附流动特性之间的关联,通过不同长宽比矩形建筑模型的同步测压试验,获取不同工况下的表面风压实测数据;分析了影响矩形建筑三维分离再附流动和分离区长度演化规律的多种因素,探讨了大尺度紊流下矩形高层建筑的非定常气动力与分离再附流动特性的内在关联;定量给出了平均分离区长度在竖向的分布规律. 研究结果表明:紊流风场的积分尺度与建筑特征尺寸的比值关系会影响分离再附流动和气动力特性的试验精准度,最大偏差可达约24%;边界层紊流的干扰导致分离剪切层曲率增大,加强了对分离区的卷夹作用,稳定再附将发生在长宽比为2时;平均分离区长度在竖向方向逐渐增大,并依据试验结果给出了高层建筑侧面风压取值的修正建议.

     

  • 图 1  风洞中的刚性测压模型

    Figure 1.  The rigid model for pressure measurements in wind tunnel

    图 2  矩形模型测点布置图

    Figure 2.  Positions of the pressure taps across the rectangle section

    图 3  B、D类风场模拟结果

    Figure 3.  Simulating result of B and D wind-field type

    图 4  方柱不同高度断面风压系数

    Figure 4.  Wind pressure coefficients at different heights of square columns

    图 5  矩形建筑模型表面风压系数(D/B = 1/2,2)

    Figure 5.  Wind pressure coefficient on the surface of rectangular building model (D/B = 1/2,2)

    图 6  矩形断面侧边分离再附流动示意

    Figure 6.  Separation-reattachment flow of rectangular section

    图 7  矩形建筑模型表面风压系数分布(D/B = 1/4,1/3,3,4)

    Figure 7.  Wind pressure coefficient on the surface of rectangular building model (D/B = 1/4,1/3,3,4)

    图 8  矩形建筑侧面极值风压系数对比

    Figure 8.  Comparison of extreme wind pressure coefficient on the lateral side of rectangular building

    表  1  不同长宽比矩形高层建筑侧面平均分离区长度

    Table  1.   Mean reattachment length of rectangular building with different side ratios

    风场类别测点层${X_{\rm r}}/B$
    $D/B = 2$$D/B = 3$$D/B = 4$
    B 类 1# 1.00 0.83 0.82
    8# 1.00 1.04 1.08
    11# 1.28 1.27 1.36
    D 类 1# 0.59 0.64 0.60
    8# 0.59 0.64 0.60
    11# 0.86 0.83 0.82
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出版历程
  • 收稿日期:  2019-04-09
  • 修回日期:  2019-07-22
  • 网络出版日期:  2020-06-15
  • 刊出日期:  2020-08-01

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