Wind Tunnel Test Research on the Effect of Rough Strips on Wind Loads of A Super High-Rise Building

doi:10.12141/j.issn.1000-565X.220290

Abstract

Abstract:

Rough strips such as curtain wall skeletons affiliated with the outer curtain wall envelopes of super high-rise buildings will change the flow pattern around the building, thereby affecting the wind loading characteristics of the buildings. However, the current Chinese building structural load code lacks relevant regulations in this regard. Given this, a systematic comparative study on a typical super high-rise building was performed under the two conditions of with and without the rough strips on the building surface by means of the HFPI (High Frequency Pressure Integration) test. By analyzing the changes of the wind loading characteristics such as wind pressure coefficient, base overturning moment and structural shape factor of wind load, the effect of rough strips on the wind load of the super high-rise building structure was studied. The results show that: setting of rough strips has little effect on the positive pressure on the building surface, but it will significantly reduce the absolute value of the peak negative pressure, with a maximum decline of about 39.8%; it will significantly affect the wind pressure distribution in the building corner area and lateral sides, leading to the significant reduction of the mean wind pressure coefficient and fluctuating wind pressure coefficient in the lateral sides, and the maximum decline is 24% and 30%, respectively. Overall, setting rough strips is beneficial to the wind-resist design of the building claddings. Setting of rough strips will affect the overall wind load of the structure. At a positive blowing angle of 0°, the rough strips will slightly increase the structural shape factor of the wind load in sections along the height of the building, with a maximum increase of about 8%, and the base overturning shear force and base overturning bending moment of the X-axis will slightly increase by 4.9% and 6.0%, respectively. Setting the rough strips has an impact on the wind angle of the peak acceleration at the top of the building, and can reduce the peak acceleration by about 7.91%.

Key words: super high-rise building, rough strip, wind tunnel test, wind load, wind pressure distribution, wind load design of building structure

CLC Number:

TU312.1

YANG Yi, WANG Xin, JI Changhui. Wind Tunnel Test Research on the Effect of Rough Strips on Wind Loads of A Super High-Rise Building[J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(4): 1-8.

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参数	取值		取值
雷诺数	8×10⁴	参考风速/（m·s^-1）	9.36
风场类型	C类	采样频率/Hz	330
缩尺比	1∶400	采样长度	20 480
参考高度H/cm	87.5	阻塞率/%	0.63

风向角/（°）	工况	剪力/MN
风向角/（°）	工况	最大值	最小值	平均值
0	光滑	20.77	-19.62	0.57
0	粗糙	20.68	-20.16	0.26
90	光滑	-11.91	-31.72	-21.82
90	粗糙	-11.85	-33.27	-22.56
180	光滑	23.43	-20.68	1.38
180	粗糙	20.74	-18.66	1.04
270	光滑	30.60	10.59	20.60
270	粗糙	31.85	11.47	21.66

风向角/（°）	工况	弯矩/（MN·m）
风向角/（°）	工况	最大值	最小值	平均值
0	光滑	6 433.55	1 988.89	4 211.22
0	粗糙	6 817.53	2 068.90	4 443.21
180	光滑	-1 828.78	-6 202.29	-4 015.44
180	粗糙	-1 808.90	-6 451.36	-4 130.13
190	光滑	-1 852.56	-6 151.95	-4 002.25
190	粗糙	-1 885.76	-6 528.11	-4 206.94
350	光滑	6 373.42	1 870.28	4 121.85
350	粗糙	6 722.94	1 982.17	4 352.56

使用功能	a_lim/（m·s^-2）
住宅，公寓	0.15
办公，旅馆	0.25

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