（1 浙江大学建筑设计研究院， 杭州 310028; 2 浙江大学结构工程研究所， 杭州 310058）

 

［摘要］以杭州新火车东站为例进行风洞试验，研究大跨度屋盖结构表面风压的非高斯分布特性及峰值因子计算方法。分别通过基于零穿越率的峰值因子法、改进峰值因子法、Sadek-Simiu法和基于经典极值理论的改进Gumbel法对各风向角下风压数据的峰值因子进行了估计，并在改进峰值因子法的基础上提出了偏度非高斯峰值因子法。对各种方法的适用性及计算结果进行对比分析表明，改进峰值因子法并不适用于峰度小于3的过程。提出的偏度非高斯峰值因子法与Sadek-Simiu法相比，计算结果十分吻合，而且对高斯过程同样适用，无需对屋盖测点进行高斯与非高斯分区。在应用时由于无需编程、计算量小、适用性好，更方便工程设计使用。

［关键词］大跨屋盖； 非高斯特性； 偏度； 峰度； 峰值因子； 偏度非高斯峰值因子法

中图分类号：TU312+.1      文献标识码：A      文章编号：1002-848X(2013)15-0083-05

 

Lin Wei1, Huang Mingfeng2, Lou Wenjuan2

 (1 Architectural Design and Research Institute of Zhejiang University, Hangzhou 310028, China; 2 Institute of Structure Engineering, Zhejiang University, Hangzhou 310058, China)

 

Abstract: The non-Gaussian characteristics and peak factor methods of wind pressures on a long-span roof were systematically analyzed by taking wind tunnel test of Hangzhou New Train Station for example. The traditional peak factor method based on a zero-crossing rate, the improved peak factor method, the Sadek-Simiu method and the improved Gumbel method were employed to estimate the peak factors of wind-induced pressures. Then a new skewness-parameter non-Gaussian peak factor method was developed based on the improved peak factor method. The applicability of various methods was discussed and compared to each other. Results show that the improved peak factor method is not applicable for some pressure processes with kurtosis smaller than three. Results of the proposed method agree well with that of the Sadek-Simiu method. Moreover, the proposed method is also applicable for Gaussian processes, without the Gaussian and non-Gaussian partition for the taps on the long-span roof. For no programming, small calculation and well application, it is more convenient for engineering design.

Keywords: Long-span roof; characteristics; non-Gaussian method; skewness; kurtosis; peak factor; parameter

*国家自然科学基金项目（51008275，50578144）。

作者简介：林巍，硕士，助理工程师，Email: lwinners@163.com。

 

［1］沈国辉,孙炳楠,楼文娟.大跨屋盖悬挑结构的风荷载分析［J］.空气动力学报，2004, 22(1):41-46.

［2］SAATHOF P J, MELBOURNE W H.The generation of peak pressures in separate/reattaching flows［J］.Wind Eng.Ind. Aerodyn,1989(32):121-134.

［3］孙瑛,武岳,林志兴, 等.大跨度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.

［4］KUMAR K S,STATHOPOULOS T.Synthesis of non-Gaussian wind pressure time series on low building roofs ［J］.Journal of Structural Engineering,1999,21:1086-1100.

［5］叶继红, 侯信真. 大跨屋盖脉动风压的非高斯特性研究［J］.振动与冲击，2010, 29(7):9-15.

［6］DAVENPORT A G.Note on the distribution of the largest value of a random function with application to gust loading ［J］. Proceedings of the Institution of Civil Engineers, 1964, 28(2):187-196.

［7］KAREEM A, ZHAO J. Analysis of non-Gaussian surge response of tension leg platforms under wind loads ［J］. Journal of Off-shore Mechanics and Arctic Engineering, ASME, 1994, 146:137-144.

［8］SADEK F, SIMIU E. Peak non-Gaussian wind effects for database-assisted low-rise building design［J］.Journal of Engineering Mechanics,ASCE,2002,128(5):530-539.

［9］GRIGORIU M. Applied non-Gaussian Processes ［M］. Englewood Cliffs, NJ: Prentice Hall, 1995: 35-58.

［10］全涌, 顾明, 陈斌,等. 非高斯风压的极值计算方法［J］. 力学学报, 2010, 42(3):560-566.

［11］埃米尔-希缪,罗伯特·H·斯坎伦. 风对结构的作用——风工程导论［M］.刘尚培,项海帆,谢霁明，译.上海：同济大学出版社, 1992: 191-215.

［12］邱天爽,张旭秀,李小兵,等.统计信号处理-非高斯信号处理及其应用［M］.北京:电子工业出版社,2004: 114-119.

［13］WINTERSTEIN S R. Nonlinear vibration models for extremes and fatigue ［J］. Journal of Engineering Mechanics, ASCE, 1988, 114(10):1772-1790.

［14］GRIGORIU M. Crossing of non-Gaussian translation process［J］. Journal of Engineering Mechanics, ASCE, 1984,110(4): 610-20.

［15］HUANG M F, CHAN C M, KWOK K, et al. A peak factor for predicting non-Gaussian peak resultant response of wind-excited tall buildings ［C］//The 7th Asia-Pacific Conference on Wind Engineering. Taipei:［s.n.］.2009.