Effects of plan dimensions on peak wind pressures of rectangular high-rise buildings

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (13) : 71-77.

LIU Yi1, CHEN Shuifu1, KOPP Gregory A2

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Abstract

In order to study effects of plan dimensions on peak wind pressure distribution on rectangular high-rise buildings, wind tunnel pressure tests were conducted for buildings with length-to-width ratios of 1-9, and then extreme value analyses were performed for fluctuating wind pressures. Peak wind pressure distribution features on various surfaces of buildings with different length-to-width ratios under winds with orthogonal directions were investigated and compared with calculated values obtained using the China load code to explore distribution states of peak wind pressure envelope on various surfaces of buildings under all wind direction angles and their varying laws with variation of plan dimensions. Results showed that plan dimensions have significant influences on leeward and side surfaces; overall, smaller length-to-width ratios go against peak negative pressure; values of wind pressure obtained using the China load code for buildings with leeward
and side surfaces enclosing have a lot of insecurity; peak wind pressure envelope distribution on wall surface considering the worst case under all wind directions and its change with variation of plan dimensions both reveal simpler laws; the proposed wind pressure value method based on envelope distribution for rectangular buildings with enclosing structure is not only simpler and easier, but also can better reflect actual wind pressure distribution and its features with variation of plan dimensions.

Key words

plan dimensions / peak wind pressure / rectangular building / high-rise building / load code

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LIU Yi1, CHEN Shuifu1, KOPP Gregory A2. Effects of plan dimensions on peak wind pressures of rectangular high-rise buildings[J]. Journal of Vibration and Shock, 2020, 39(13): 71-77

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