Title: Post-Tensioned Self-Centering System Efficiency against Extreme Wind Loads

Author(s): Hamidreza Alinejad, Thomas H.-K. Kang, and Seung Yong Jeong

Publication: Structural Journal

Volume: 119

Issue: 5

Appears on pages(s): 271-283

Keywords:

DOI: 10.14359/51734900

Date: 9/1/2022

Abstract:
For tall buildings, wind demand under extreme wind loads is so large that design based on conventional elastic behavior can be difficult. A practical solution is to permit inelastic behavior to introduce hysteretic damping and reduce design wind force. Therefore, the inelastic behavior of structures subject to wind loads should be thoroughly investigated. The presumption is that applications currently applied in inelastic seismic design can be employed in inelastic wind design of concrete buildings. In this research, behaviors of elastic, bilinear, and self-centering single-degree-of freedom systems under along-wind load were studied for various design wind speeds using nonlinear time-history analysis. Self centering systems—in particular, unbonded post-tensioned concrete systems—given their wide use and high potential and flexibility for self-centering behavior, were found to have smaller maximum displacement than bilinear systems, with differences being considerable at higher wind speeds. Results found highlight the role of post-yield stiffness in reduction of maximum displacement. Self-centering systems were also found to be highly influenced by reverse-yielding values. Systems with reverse yield strength equal to the standard deviation of the elastic force (approximately 20% of [mean + background + resonant components]) demonstrated minimum displacement. In addition, design parameters such as ductility, overstrength, and displacement factor are reported for inelastic design based on the concept of a response modification factor.