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Smart Structures and Systems
  Volume 30, Number 6, December 2022 , pages 627-637

The influences of equivalent viscous damping ratio determination on direct displacement-based design of un-bonded post-tensioned (UPT) concrete wall systems
Anqi Gu and Shao-Dong Shen

    Recent years, direct displacement-based design (DDBD) procedure is proposed for the design of un-bonded posttensioned (UPT) concrete wall systems. In the DDBD procedure, the determination of the equivalent viscous damping (EVD) ratio is critical since it would influence the strength demand of the UPT wall systems. Nevertheless, the influence of EVD ratio determination of the UPT wall systems were not thoroughly evaluated. This study was aimed to investigate the influence of different EVD ratio determinations on the DDBD procedure of UPT wall systems. Case study structures with four, twelve and twenty storeys have been designed with DDBD procedure considering different EVD ratio determinations. Nonlinear time history analysis was performed to validate the design results of those UPT wall systems. And the simulation results showed that the global responses of the case study structures were influenced by the EVD ratio determination.
Key Words
    direct displacement-based design; equivalent viscous damping ratio determination; nonlinear time histories analysis; un-bonded post-tensioned concrete wall
(1) Anqi Gu:
Department of Mechanical Engineering, University of Canterbury, Christchurch, New Zealand;
(2) Shao-Dong Shen:
Disaster Prevention Research Institute, Kyoto University, Uji 611-0011, Japan.

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