Performance of Detached Post-Tensioned Precast Concrete Walls Subjected to Near-Field Earthquakes

Document Type : Research Article

Authors

Faculty of Civil Engineering, Urmia University of Technology, Urmia, Iran

Abstract

The recorded recent earthquake events show that near-field earthquakes have different characteristics than far-field earthquakes. The most important distinguishing feature of near-field movements is the production of pulses due to the effect of orientation and the effect of permanent displacement. Therefore, it is necessary to study such effects on structures. In this research, first, the proposed mathematical model is validated according to the results of experiments. In order to study the nonlinear seismic behavior of post-tensioned precast concrete walls (PT-PCW), nonlinear dynamic analysis has been performed on six-story structures under near-field accelerations. Also, the effect of wall pier confinement on the self-centered performance and energy dissipation has been evaluated by performing dynamic analysis. Each acceleration is scaled to two levels of design-based earthquake (DBE) and the maximum considered earthquake (MCE) and then is used in the analysis. The performed analyzes show the optimal performance of the post-tensioned precast concrete wall system in response to earthquakes on DBE, so that at the end of the seismic load, the system does not suffer any structural damage, and minor lateral displacement remains in the system. The results also show that increasing the height of the wall pier confinement to a value slightly higher than the minimum specified in the seismic design codes promotes seismic behavior for MCE and increases the reliability of the system against overturning. The study also found that the use of post-tensioned cables in the boundary areas of the wall as an energy dissipation factor does not have a significant effect on improving the energy absorption performance of the system and the small deformations created in these members cause energy dissipation through crushing of concrete.

Keywords

References

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Bulletin of Earthquake Science and Engineering
Volume 7, Issue 3 - Serial Number 24
November 2020
Pages 135-150

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History

  • Receive Date: 29 June 2018
  • Accept Date: 02 June 2019

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