Effects of plan dimensions on gust wind loads for high-rise buildings

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 to 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.

Wind Loads on Structures: A Finite Element-Based Computational Fluid Dynamics Analysis in Evaluating the Wind Tunnel Effects on Low-Rise Structures

“…The results of this investigation reveal that modifying the height and spacing ratios can significantly impact the wind pressure distribution of a specific low-rise building. [10]The design coefficients for wind load on the main wind-force resisting systems (MWFRSs) should be established based on the highest load effect [11]. [12] conducted smaller-sized experiments to measure turbulent flow patterns in three dimensions around a cluster of buildings in a wind tunnel located at the Niigata Institute of Technology, Japan.…”

“…CFD numerical simulation technique was employed to examine how multi-story or high-rise structures affect the surface wind loads of low-rise buildings by [9]. [10] utilized the ASCE 7-16 provisions for Main Wind-Force Resisting System (MWFRS) for comparison in order to validate the results of their study. In 2022, [12]comprehensively assessed the accuracy of computational fluid dynamics (CFD) models in predicting average and turbulent wind patterns around a tall skyscraper within a context of short buildings and narrow streets.…”

Parametric Analysis of the Shear Lag Effect in Tube Structural Systems of Tall Buildings

“…The same principle of bracing can be used for tube in tube structural systems [21]. In recent years, the research conducted is mostly based on parametric analysis of different structural systems [22][23][24][25]. In [22] a parametric analysis is conducted where the main parameter being varied are the layout dimensions of the building.…”

“…In recent years, the research conducted is mostly based on parametric analysis of different structural systems [22][23][24][25]. In [22] a parametric analysis is conducted where the main parameter being varied are the layout dimensions of the building. The main idea is to see how the ratio of the layout dimensions of a rectangular shaped building affects the buildings behavior when subjected to strong winds.…”