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复杂树状结构树冠风荷载研究*
齐鹏1,李秋胜1,2,陈伏彬3,王哲4,黎丹5
摘 要

(1 湖南大学土木工程学院, 长沙 410082; 2 香港城市大学建筑学与土木工程学系, 香港 999077; 3 长沙理工大学土木与建筑学院, 长沙 410082; 4 北京市建筑设计研究院有限公司,  北京 100045; 5 珠海华发城市运营投资控股有限公司, 珠海 519030)

[摘要]以珠海华发艺术馆初步设计方案为工程背景,选取最高的5号生态树作为研究对象,基于测压试验获得的风压时程,对生态树树冠部分的风荷载特性进行了研究。分析了网壳表面的风压分布情况以及测点风压时程的非高斯特性,结果表明,网壳表面整体表现为向上的升力作用,且在背风区域出现较明显的沿顺风向对称分布的负压区域;迎风面区域风压呈现标准高斯特性,背风面部分区域风压出现非高斯特性,且为正偏态。并对生态树测点风压的频谱特性进行了研究,结果显示,网壳结构迎风边缘以及网壳中部区域有较大的脉动能量且频谱成分较为丰富,而横向边缘及尾流区域脉动程度相对较小;网壳迎风表面上、下测点相关性表现为正相关,迎风区域上、下表面的测点相关性大于背风区域上、下表面测点的相关性。

[关键词]树状结构; 凯威特网壳; 风洞试验; 风荷载; 频谱特性

中图分类号:TU242-2, TU973+.32文献标识码:A文章编号:1002-848X(2018)06-0092-05

 

Study on wind loads of tree crowns of complex tree-shaped structures 

Qi Peng1, Li Qiusheng1,2, Chen Fubin3, Wang Zhe4, Li Dan5

(1 College of Civil Engineering, Hunan University, Changsha 410082, China; 2 Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong 999077, China; 3 College of Civil Engineering and Architecture, Changsha University of Science & Technology, Changsha 410082, China; 4 Beijing Institute of Architectural Design, Beijing 100045, China; 5 Zhuhai Huafa Urban Operations & Investment Holdings Co., Ltd., Zhuhai 519030, China)

Abstract:Taking the preliminary design scheme of  Huafa Art Museum in Zhuhai as engineering background and the No. 5 ecological tree (highest one) as the research object, the study on wind loads characteristics of the ecological tree crown was conducted by using wind pressure time-history recorded in wind tunnel test. The wind pressure distribution on the shell surface and the non-Gaussian characteristics were analyzed. The results show that the overall performance of the wind pressures on the shell surface performs as the lift force, and the negative pressure region which distributes symmetrically along the wind direction is significant in the leeward region. The wind  pressure in the windward region shows a standard Gauss behavior, while that in partial leeward region wind presents an obvious non-Gaussian behavior with positive skewness. The spectral characteristic of the wind pressure on measured points of the ecological tree was studied. The results show that there has a large pulse energy and rich frequency spectrum composition at the windward edge and central area on shell surface. The fluctuating degree of horizontal edge and wake area is relatively small. The correlation of upper and lower measured points is positive overall, while those at the windward edge is greater than those at leeward area. 

Keywords:tree-shaped structure; Kiewitt reticulated shell; wind tunnel test; wind load; spectral characteristic

 

*国家自然科学基金项目(51408062,51478405),湖南省创新平台与人才计划项目(2015RS4050),中国博士后基金(2015M572238)。

 

作者简介:齐鹏,硕士,Email:qip13@hnu.edu.cn。

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