Experimental study of across‐wind aerodynamic damping of super high‐rise buildings with aerodynamically modified square cross‐sections

Citations Over TimeTop 15% of 2013 papers

Abstract

SUMMARY Across‐wind aerodynamic damping ratios are determined from the wind‐induced acceleration responses of 10 aeroelastic models of square super high‐rise buildings in an urban flow condition (exposure category C in the Chinese code) using the random decrement technique. Moreover, the influences of amplitude‐dependent structural damping ratio on the estimation of aerodynamic damping ratio are discussed. The validity of estimated damping is examined through a comparison with previous research achievements. On the basis of the estimated results, the characteristics of the across‐wind aerodynamic damping ratios of modified square high‐rise buildings are studied. The effects of aerodynamically modified cross‐sections, such as chamfered, slotted and tapered cross‐section, on the across‐wind aerodynamic damping ratio are investigated. The results indicate that modifications of cross‐sections are not always effective in suppressing the aeroelastic effects of super high‐rise buildings. Low corner‐cut ratios (chamfer ratios from 5% to 20% and slot ratios from 5% to 10%) and low taper ratio (1%) significantly decrease the magnitudes of absolute aerodynamic damping ratios. However, large modifications of cross‐sections (slot ratio of 20% and taper ratios from 3% to 5%) increase wind‐induced responses by changing the aerodynamic damping ratios. According to the database, empirical aerodynamic damping function parameters are fitted for high‐rise buildings with aerodynamically modified square cross‐sections. Copyright © 2013 John Wiley & Sons, Ltd.

Related Papers

• → Aerodynamic instability of a bridge deck section model: Linear and nonlinear approach to force modeling(2010)156 cited
• → Aeroelastic Analysis of Bridges: Effects of Turbulence and Aerodynamic Nonlinearities(2003)108 cited
• → Investigation on influence factors of buffeting response of bridges and its aeroelastic model verification for Xiaoguan Bridge(2008)42 cited
• → On the characteristics of the aerodynamic forces caused by gusts on flat bridge decks(1994)1 cited
• Time-Domain Buffeting Analysis of a Cable-Stayed Bridge Considering Frequency-Dependency of Unsteady Aerodynamic Forces(2007)