Abstract
In order to systematically investigate the gust effect factor for rigid buildings, the derivation of the gust effect factor in ASCE 7–16 is carefully reviewed and scale model pressure tests were carried out for rectangular-plan high-rise buildings with plan aspect ratios ranging from 0.11 to 9. The gust effect factor and the aerodynamic admittance function (AAF) for area-averaged pressure coefficients and base drag coefficients were obtained and discussed in detail. The results show that the AAF has direct influence on the value of the gust effect factor, depending on whether effects of non-contemporaneous gust actions or body-generated turbulence are playing a leading role. The ASCE 7–16 gust effect factor for rigid buildings underestimates the measured values for individual walls due to differences in the AAF, peak factors, and the employment of the 3 s moving average filter. However, the ASCE 7–16 gust factor for overall drag is estimated within 5% or better.
Highlights
The gustiness in wind can be regarded as a combination of eddies of different sizes (Greenway, 1979; Holmes, 2015)
The objective of the paper is to systematically investigate the gust effect factor for rigid high-rise buildings based on an experimental approach
For pressures on the windward wall and base drag, admittance function (AAF) decreases with frequency for high frequencies, meaning that the effects of non-contemporaneous gust actions are playing a leading role
Summary
The gustiness in wind can be regarded as a combination of eddies of different sizes (Greenway, 1979; Holmes, 2015). It is assumed that maximum wind loads acting on the entire structure are caused by well-correlated gusts that envelope the entire structure. For flexible buildings, these wind gusts can introduce dynamic oscillations of the structure, such that maximum loads should include these load effects. For loads on building components and cladding, maximum loads occur through a combination of the well-correlated large-scale gusts with the smaller scale eddies in the wind and those generated by the building. The concept provides a straightforward approach to estimate the equivalent static wind loads, i.e., the loads that when statically applied to the building will cause the same maximum response (Kareem and Zhou, 2003)
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