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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2024, Vol. 58 Issue (7): 1467-1478    DOI: 10.3785/j.issn.1008-973X.2024.07.016
    
Experimental study on wind load characteristics of continuous roof with concave surface
Shuren HAO1(),Tian’e LI1,*(),Hui PENG2,Haiquan WU2,Yueqin YAN2,Haiwang LI1,Ning SU3
1. College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2. Shanxi Fifth Construction Group Limited Company, Taiyuan 030013, China
3. School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin 132012, China
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Abstract  

Wind tunnel pressure measurement tests on rigid models of three types of concave surface roofs with different continuous roof numbers were conducted to study the wind load characteristics and provide wind resistance design references for practical engineering. The influences of continuous roof numbers and wind direction angle on the lift coefficient, mean wind pressure coefficient, and peak wind pressure coefficient were systematically analyzed. The results show that the overall lift coefficient decreases with the increase of continuous roof numbers, and the lift coefficient of each roof is greatly affected by the wind direction angle. Under the conditions of different continuous roof numbers and wind direction angles, the whole roof withstands upward wind suction and the mean wind pressure coefficient exhibits complex fluctuations. A significant airflow separation phenomenon appears at the edge of the windward roof, corresponding to high wind suction. The further away from the windward roof, the more stable the distribution of the mean wind pressure coefficient, which was stable at about ?0.1. The continuous roof numbers exhibit a significant influence on the peak pressure coefficient, especially on the negative peak wind pressure coefficient. The minimum value of the negative peak wind pressure coefficient was ?5.1 for the edge roof and ?3.3 for the middle roof. Based on the test results, the mean and peak wind pressure coefficients for different zoning continuous roofs with concave surfaces were given out.

Key words： concave surface roof      wind tunnel test      wind load      interference effect      wind pressure zoning     
Received: 29 June 2023      Published: 01 July 2024
CLC:  TP 393.3  
  TU 312.1  
Fund:  国家自然科学基金资助项目（52202415）；山西省基础研究计划资助项目（202203021221044）；山西五建集团有限公司科研项目（RH2100002871）.
Corresponding Authors: Tian’e LI     E-mail: pangshijin2021@163.com;woshitiane@126.com
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Shuren HAO
Tian’e LI
Hui PENG
Haiquan WU
Yueqin YAN
Haiwang LI
Ning SU
Cite this article:

Shuren HAO,Tian’e LI,Hui PENG,Haiquan WU,Yueqin YAN,Haiwang LI,Ning SU. Experimental study on wind load characteristics of continuous roof with concave surface. Journal of ZheJiang University (Engineering Science), 2024, 58(7): 1467-1478.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2024.07.016     OR     https://www.zjujournals.com/eng/Y2024/V58/I7/1467


联排凹曲面屋盖的风荷载特性试验研究

为了探究凹曲面屋盖的风荷载特性并为实际工程提供抗风设计参考，对3种联排凹曲面屋盖进行刚性模型风洞测压试验，系统分析联排数及风向角对凹曲面屋盖升力系数、平均风压系数和极值风压系数的影响. 结果表明：屋盖整体升力系数随着联排数的增加不断降低，各屋盖的升力系数受风向角影响较大. 在不同联排数及风向角下，屋盖整体承受向上的风吸力，屋盖的平均风压系数表现出复杂的波动性；在迎风屋盖边缘处的气流分离现象明显，导致该处存在较大风吸力；越远离迎风侧的屋盖，平均风压系数的波动越小，稳定于?0.1. 联排数对极值风压系数的影响不可忽略，尤其是极小值负压系数，边缘屋盖分区极小值负压系数的最小值为?5.1，中间屋盖分区极小值负压系数的最小值为?3.3. 基于试验结果，总结给出不同联排凹曲面屋盖分区的平均风压系数和极值风压系数.


关键词： 凹曲面屋盖,  风洞试验,  风荷载,  干扰效应,  风压分区 
工况屋盖形式联排数测点数
R1A单跨122
R2B-C双跨210
R3B-C-A三跨332
Tab.1 Wind tunnel test conditions and testing points
Fig.1 Testing points arrangement of three-span roofs and wind direction angle
Fig.2 Schematic diagram of wind tunnel test installation
Fig.3 Parameters setting for wind tunnel test
项目尺度/m风速/(m·s?1)时间/min
模型尺度110.01.0
原型尺度25029.883.9
Tab.2 Scale-to-scale ratio for wind tunnel test
Fig.4 Lift coefficient of whole roof and edge roof
Fig.5 Lift coefficient of different roof forms
Fig.6 Distribution of mean wind pressure coefficient
屋盖形式Cp
θ=0°θ=30°θ=60°θ=90°
A(迎风屋盖)?0.36?0.38?0.41?0.52
C(中间屋盖)?0.48?0.34?0.09?0.07
B(背风屋盖)?0.45?0.36?0.20?0.07
Tab.3 Overall mean pressure coefficients of roofs at different wind direction angle （case R3）
Fig.7 Mean wind pressure of roof zoning
Fig.8 Zoning value of mean wind pressure coefficient
分区Cp，R1工况Cp，R2工况Cp，R3工况
θ=0°θ=30°θ=60°θ=90°θ=0°θ=30°θ=60°θ=90°θ=0°θ=30°θ=60°θ=90°
B1————?0.88?0.54?0.06?0.04?0.91?0.61?0.050.02
B2————?1.02?0.67?0.06?0.08?1.05?0.73?0.070.01
B3————?1.05?0.74?0.27?0.16?1.08?0.77?0.25?0.09
B4————?1.01?0.90?0.63?0.23?1.04?1.48?0.59?0.17
B5————?0.22?0.18?0.05?0.12?0.19?0.08?0.05?0.03
B6————?0.23?0.11?0.04?0.16?0.21?0.09?0.08?0.03
B7————?0.25?0.22?0.24?0.25?0.24?0.03?0.28?0.12
B8————?0.27?0.39?0.39?0.31?0.27?0.44?0.39?0.22
B9————?0.09?0.05?0.010.07?0.07?0.02?0.060.07
B10————?0.10?0.08?0.010.05?0.07?0.10?0.100.06
B11————?0.11?0.21?0.13?0.09?0.09?0.14?0.22?0.09
B12————?0.14?0.28?0.25?0.26?0.11?0.35?0.27?0.23
C1————?1.00?0.62?0.04?0.38?1.05?0.54?0.050.03
C2————?1.08?0.70?0.09?0.54?1.14?0.70?0.07?0.02
C3————?1.07?0.73?0.44?0.55?1.14?0.77?0.27?0.10
C4————?0.93?1.45?1.13?0.47?0.94?0.90?0.45?0.20
C5————?0.24?0.06?0.19?0.60?0.26?0.180.08?0.01
C6————?0.200.07?0.34?0.78?0.25?0.140.07?0.07
C7————?0.17?0.06?0.65?0.80?0.26?0.24?0.10?0.16
C8————?0.18?0.47?0.76?0.68?0.28?0.37?0.28?0.25
C9————?0.120.03?0.34?0.23?0.11?0.050.100.11
C10————?0.10?0.01?0.41?0.54?0.10?0.070.090.07
C11————?0.09?0.27?0.42?0.69?0.10?0.17?0.02?0.05
C12————?0.11?0.35?0.38?0.61?0.11?0.22?0.17?0.20
A1?0.69?0.45?0.02?0.26————?1.01?0.65?0.04?0.23
A2?0.87?0.59?0.09?0.46————?1.09?0.74?0.07?0.40
A3?0.87?0.64?0.40?0.49————?1.07?0.80?0.33?0.45
A4?0.50?1.38?1.22?0.67————?0.61?0.76?1.42?0.71
A5?0.13?0.10?0.19?0.51————?0.22?0.11?0.04?0.41
A6?0.110.09?0.29?0.71————?0.18?0.10?0.13?0.60
A7?0.11?0.12?0.57?0.72————?0.13?0.19?0.47?0.62
A8?0.06?0.57?0.89?0.86————?0.08?0.34?0.91?0.86
A9?0.060.02?0.28?0.20————?0.08?0.04?0.26?0.17
A10?0.050.05?0.33?0.46————?0.06?0.05?0.34?0.41
A11?0.06?0.18?0.35?0.58————?0.05?0.12?0.35?0.53
A12?0.07?0.31?0.49?0.86————?0.06?0.22?0.51?0.88
Tab.4 Reference value of mean wind pressure coefficient of roof zoning
Fig.9 Distribution of peak wind pressure coefficient
Fig.10 Peak wind pressure of roof zoning
Fig.11 Zoning value of peak wind pressure coefficient
分区R1工况R2工况R3工况
CpmaxCpminCpmaxCpminCpmaxCpmin
B1——0.7?5.20.7?5.1
B2——0.5?3.80.7?3.8
B3——0.6?2.50.6?2.5
B6——0.9?2.50.6?2.1
B7——0.7?2.31.0?2.5
C1——0.7?3.20.4?3.3
C2——0.5?2.90.4?2.9
C3——0.7?2.60.5?2.5
C6——0.7?2.20.5?1.0
C7——0.7?2.30.5?1.0
A11.0?4.8——0.7?3.6
A20.8?3.7——0.7?3.1
A30.6?2.3——0.8?2.6
A60.6?2.2——0.6?2.2
A70.6?2.2——0.7?2.5
Tab.5 Reference value of peak wind pressure coefficient of roof zoning
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