基于混合风压分区方法的鞍型屋盖风压分区研究
引用文献：
韩啟金 刘敏 杨庆山 殷佳齐. 基于混合风压分区方法的鞍型屋盖风压分区研究[J]. 建筑结构，2023，48（12）：103-109.
HAN Qijin LIU Min YANG Qingshan YIN Jiaqi. Study on wind pressure zoning of saddle roof based on mixed wind pressure zoning method[J]. Building Structure，2023,48（12）：103-109.
摘要：鞍型屋盖应用广泛，既有客观风压分区方法对鞍型屋盖的适用性尚未得到验证，故鞍型屋盖风压分区特征不明。针对以上问题，对鞍型屋盖风压分区进行了研究。总结了基于风压空气动力特性的方法和基于聚类的数据驱动方法的优缺点，提出了既有方法无法同时考虑风压极值大小和位置的问题。针对鞍型屋盖风压分区构造了一种能同时考虑风压极值大小和位置的混合风压分区方法。基于我国A类地貌条件下的鞍型屋盖风洞试验结果，采用不同风压分区方法对其进行了风压分区，讨论了不同分区方法下的分区特征。结果表明：混合风压分区方法结合了基于空气动力特性分区方法确定极值位置和数据驱动方法对极值大小分类的优点，能够合理完成鞍型屋盖风压分区；基于鞍型屋盖全风向风压分布特征，可划分为角部区、边缘区和中心区三个分区。
关键词：鞍型屋盖；风压极值；风压分区；混合风压分区法；
基金：国家自然科学基金青年基金项目(51808077)；重庆市留学人员回国创新支持计划(cx2019024)。
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参考文献[1] 建筑结构荷载规范：GB 50009—2012[S].北京：中国建筑工业出版社，2012.
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[12] DONG X,YE J.The point and area-averaged wind pressure influenced by conical vortices on saddle roofs[J].Journal of Wind Engineering and Industrial Aerodynamics,2012,101:67-84.
[13] ALRAWASHDEH H.Wind pressures on flat roof edges and corners of large low buildings[D].Montreal:Concordia University,2015:51-95.
[14] ALDOUM M.Wind loads on low-slope roofs of low-rise and mid-rise buildings with large plan dimensions[D].Montreal:Concordia University,2018:32-40.
[15] BEZDEK J C,PAL N R.Some new indexes of cluster validity[J].IEEE Transactions on Systems,Man,and Cybernetics,Part B (Cybernetics),1998,28(3):301-315.
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[19] LIU M,CHEN X,YANG Q,et al.Characteristics of dynamic pressures on a saddle type roof in various boundary layer flows[J].Journal of Wind Engineering and Industrial Aerodynamics,2016,150:1-14.
[2] Recommendations for loads on buildings :AIJ-2004 [S].Tokyo:Architectural Institute of Japan,2004.
[3] Minimum design loads and associated criteria for buildings and other structures:ASCE/SEI 7-16 [S].Reston,VA:American Society of Civil Engineers,2017.
[4] User’s guide:NBC 2015 structural commentaries,structural commentaries (part 4 of division B):NBCC-2015 [S].Ottawa:National Research Council of Canada,2015.
[5] STATHOPOULOS T,SAATHOFF P.Wind pressure on roofs of various geometries[J].Journal of Wind Engineering and Industrial Aerodynamics,1991,38(2-3):273-284.
[6] ALRAWASHDEH H,STATHOPOULOS T.Wind pressures on large roofs of low buildings and wind codes and standards[J].Journal of Wind Engineering and Industrial Aerodynamics,2015,147:212-225.
[7] 李丹煜.大宽高比建筑屋盖围护结构设计风荷载研究[D].北京：北京交通大学，2017:55-76.
[8] 孙瑛，武岳，林志兴，等.大跨屋盖结构风压脉动的非高斯特性[J].土木工程学报，2007,40(4):1-5,12.
[9] 潘钧俊，李方慧，顾明，等.不同风场开敞和封闭的鞍型屋盖平均风压特性[J].同济大学学报(自然科学版),2009,37(6):715-719.
[10] 顾明，李方慧，潘钧俊，等.不同风场下开、闭鞍型屋盖脉动风压特性分析[J].同济大学学报(自然科学版),2010,38(7):969-975.
[11] 叶继红，孙虎跃.马鞍屋盖表面分离泡流动形态研究[J].振动工程学报，2016,29(6):1097-1107.
[12] DONG X,YE J.The point and area-averaged wind pressure influenced by conical vortices on saddle roofs[J].Journal of Wind Engineering and Industrial Aerodynamics,2012,101:67-84.
[13] ALRAWASHDEH H.Wind pressures on flat roof edges and corners of large low buildings[D].Montreal:Concordia University,2015:51-95.
[14] ALDOUM M.Wind loads on low-slope roofs of low-rise and mid-rise buildings with large plan dimensions[D].Montreal:Concordia University,2018:32-40.
[15] BEZDEK J C,PAL N R.Some new indexes of cluster validity[J].IEEE Transactions on Systems,Man,and Cybernetics,Part B (Cybernetics),1998,28(3):301-315.
[16] 杨善林，李永森，胡笑旋，等.K-means 算法中的 k 值优化问题研究[J].系统工程理论与实践，2006,26(2):97-101.
[17] DAVIES D L,BOULDIN D W.A cluster separation measure[J].IEEE Transactions on Pattern Analysis and Machine Intelligence,1979,1(2):224-227.
[18] ROUSSEEUW P J.Silhouettes:a graphical aid to the interpretation and validation of cluster analysis[J].Journal of Computational and Applied Mathematics,1987,20:53-65.
[19] LIU M,CHEN X,YANG Q,et al.Characteristics of dynamic pressures on a saddle type roof in various boundary layer flows[J].Journal of Wind Engineering and Industrial Aerodynamics,2016,150:1-14.
Study on wind pressure zoning of saddle roof based on mixed wind pressure zoning method
Abstract: Saddle roof is widely used. The applicability of the existing objective wind pressure zoning method to saddle roofs has not been verified. Thus, the characteristics of saddle roof wind pressure zoning are unknown. In response to the above problem, a research on saddle roof wind pressure zoning has been carried out. The advantages and disadvantages of the existing zoning method based on the aerodynamic characteristics of wind pressure and the data-driven method of clustering was summarized. It was pointed out that the existing methods cannot consider the value and location of wind pressure extremes at the same time. A mixed wind pressure zoning method was proposed for saddle roof wind pressure zone, which can consider the extreme value and location of wind pressure at the same time. According to the wind tunnel test results of the saddle roof under the condition of terrain A in China, different wind pressure partitioning methods were used to partition the wind pressure, and the partition characteristics under different partitioning methods were discussed. The results show that the mixed wind pressure zoning method combines the advantages of determining the extremum location based on aerodynamic characteristics and the data driven method to classify the extremum size, and can reasonably complete the wind pressure partition of saddle roof. Based on the wind pressure distribution characteristics of saddle roof, it can be divided into three areas: corner area, edge area and central area.
Keywords: saddle roof; extreme wind pressure; wind pressure zoning; mixed wind pressure zoning method
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