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(1 湖南省建筑設(shè)計(jì)院集團(tuán)股份有限公司, 長沙 410012;2 湖南大學(xué)風(fēng)工程與橋梁工程湖南省重點(diǎn)實(shí)驗(yàn)室, 長沙 410082)

摘要: 因高層建筑結(jié)構(gòu)具有自振周期較長、阻尼低以及沿高度分布質(zhì)量較輕的特點(diǎn),風(fēng)荷載往往成為高層建筑設(shè)計(jì)的主要控制荷載,而高層建筑的外形對(duì)結(jié)構(gòu)的抗風(fēng)性能影響顯著,為研究不同橫截面高層建筑的氣動(dòng)特性,采用數(shù)值模擬方法,對(duì)六種不同截面(方形、矩形及 10%修正率的削角、凹角截面)的氣動(dòng)特性進(jìn)行了全風(fēng)向下數(shù)值模擬計(jì)算,分析比較了不同截面的風(fēng)壓系數(shù)、氣動(dòng)力系數(shù)以及斯托羅哈數(shù)等參數(shù)。 結(jié)果表明:削角、凹角截面可以有效減小氣動(dòng)阻力,其中,削角截面減阻效果最為明顯,在小風(fēng)向角下阻力可以最大減小 30%。 但是,削角、凹角截面的角點(diǎn)上風(fēng)壓系數(shù)變化劇烈,其中最大可達(dá)到未修正截面的 14 倍之多,且相比于未修正截面,削角、凹角截面風(fēng)壓系數(shù)受紊流度影響較大。

關(guān)鍵詞: 高層建筑; 削角截面; 凹角截面; 氣動(dòng)特性; 氣動(dòng)阻力

中圖分類號(hào):TU312,TU972 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2022)22-0095-06

DOI:10. 19701 / j. jzjg. ZJ220077

Study on aerodynamic characteristics of high-rise buildings with chamfered and concave corners

LIU Jianwen1, LIAO Zhaoyang2, DENG Yangchen2

(1 Hunan Architectural Design Institute Group Co. , Ltd. , Changsha 410012, China; 2 Key Laboratory for Windand Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China)

Abstract: Due to the long natural vibration period, low damping and light distribution of mass along the height of high-risebuilding structures, wind load is often the main control load in high-rise building design. The shape of high-rise buildinghas a significant influence on the wind resistance of structures. In order to study the aerodynamic characteristics of high-risebuildings with different cross-sections, the numerical simulation method was used to simulate and calculate the aerodynamiccharacteristics of six different sections (square, rectangular, and chamfered and concave section with 10% correction rate)numerically in full wind down. The parameters such as wind pressure coefficient, aerodynamic coefficient and StrouhalNumber of different sections were analyzed and compared. The results show that the chamfered and concave sections caneffectively reduce the aerodynamic drag, among which the chamfered section has the most obvious drag reduction effect,and the drag can be reduced by 30% at a small wind direction angle. However, the wind pressure coefficients at the cornersof the chamfered and concave sections change drastically, and the maximum can be as much as 14 times that of theuncorrected sections. Compared with the uncorrected sections, the wind pressure coefficients of the chamfered and concavesections are largely affected by the turbulence intensity.

Keywords:high-rise building; chamfered section; concave section; aerodynamic characteristics; aerodynamic drag

∗大澤湖海歸小鎮(zhèn)國際社區(qū)配套設(shè)施研究(KY03-0000-2022-0011)。

第一作者:劉建文,碩士,正高級(jí)工程師,一級(jí)注冊(cè)結(jié)構(gòu)工程師,主要從事建筑結(jié)構(gòu)設(shè)計(jì),Email:570190762@ qq. com。

[引用本文] 劉建文,廖朝陽,鄧羊晨. 削角、凹角截面高層建筑氣動(dòng)力研究[ J]. 建筑結(jié)構(gòu),2022,52(22):95-100.LIU Jianwen,LIAO Zhaoyang,DENG Yangchen. Study on aerodynamic characteristics of high-rise buildings with chamferedand concave corners[J]. Building Structure,2022,52(22):95-100.