Effects of plan dimensions on gust wind loads for high-rise buildings. Issue 194 (November 2019)

• Record Type: Journal Article
• Authors: Liu, Yi; Kopp, Gregory A.; Chen, Shui-fu
• Is Part Of: Journal of wind engineering and industrial aerodynamics. Issue 194(2019)
• Publication Date: 2019-11
• Subjects: Wind loads -- Building aerodynamics -- High-rise buildings -- Structural loads -- Wall pressure coefficients; Wind-pressure -- Periodicals; Buildings -- Aerodynamics -- Periodicals; Pression du vent -- Périodiques; Constructions -- Aérodynamique -- Périodiques; Buildings -- Aerodynamics; Wind-pressure; Periodicals
• DOI: 10.1016/j.jweia.2019.103980
• Languages: English
• ISSNs: 0167-6105

Abstract

Abstract: Scale-model wind tunnel pressure measurements were carried out for rectangular-plan high-rise buildings with plan ratios ranging from 0.11 to 9. Mean, fluctuating, and peak wall pressure coefficient distributions and area-averages were investigated. In addition, comparisons with the ASCE 7–16 provisions for the Main Wind Force-Resisting System (MWFRS) were made. The results show that the plan ratio has significant effects on pressure coefficients on the leeward and side walls for plan ratios less than about 4. The largest mean base shear coefficient occurs for plan ratio of about 0.67, with large values in the range of 0.5–1, but decreasing for larger or smaller plan ratios. ASCE 7–16 mean load coefficients tend to underestimate the data, particularly because of the values on leeward walls. ASCE 7–16 also underestimates the peak load coefficients due to the value of the gust effect factor. For rigid buildings, ASCE 7–16 has a gust effect factor of 0.85, while measurements indicate that it is closer to 1 for plan ratios between 0.67 and 2. Thus, the overall mismatch between the ASCE 7–16 MWFRS loads and the measured data is due to both the mean pressure coefficients and the gust effect factor. For plan ratios below 0.67, the decrease in plan ratio tends to be favorable for the MWFRS load coefficients; while for plan ratios above 4, the effects of plan ratios on the MWFRS load coefficients are limited. Highlights: Wind pressures were measured for rectangular tall buildings with plan ratios up to 9. Plan ratio has great effects on wind pressures on the leeward and side walls. ASCE 7 tends to underestimate mean wind load coefficients on the leeward walls. Measured gust effect factors are close to 1 for plan ratios between 0.5 and 2. ASCE 7 tends to underestimate peak loads due to mean loads and gust effect factor.