A numerical study on seismic response of self-centring precast segmental columns at different post-tensioning forces

Ehsan Nikbakht, Khalim Rashid, Farzad Hejazi, Siti Aminah Osman

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Precast bridge columns have shown increasing demand over the past few years due to the advantages of such columns when compared against conventional bridge columns, particularly due to the fact that precast bridge columns can be constructed off site and erected in a short period of time. The present study analytically investigates the behaviour of self-centring precast segmental bridge columns under nonlinear-static and pseudo-dynamic loading at different prestressing strand levels. Self-centring segmental columns are composed of prefabricated reinforced concrete segments which are connected by central post-tensioning (PT) strands. The present study develops a three dimensional (3D) nonlinear finite element model for hybrid post-tensioned precast segmental bridge columns. The model is subjected to constant axial loading and lateral reverse cyclic loading. The lateral force displacement results of the analysed columns show good agreement with the experimental response of the columns. Bonded post-tensioned segmental columns at 25%, 40% and 70% prestressing strand stress levels are analysed and compared with an emulative monolithic conventional column. The columns with a higher initial prestressing strand levels show greater initial stiffness and strength but show higher stiffness reduction at large drifts. In the time-history analysis, the column samples are subjected to different earthquake records to investigate the effect post-tensioning force levels on their lateral seismic response in low and higher seismicity zones. The results indicate that, for low seismicity zones, post-tensioned segmental columns with a higher initial stress level deflect lower lateral peak displacement. However, in higher seismicity zones, applying a high initial stress level should be avoided for precast segmental self-centring columns with low energy dissipation capacity.

Original languageEnglish
Pages (from-to)864-883
Number of pages20
JournalLatin American Journal of Solids and Structures
Volume11
Issue number5
Publication statusPublished - 2014

Fingerprint

Seismic response
Prestressing
Stiffness
Precast concrete
Reinforced concrete
Energy dissipation
Earthquakes

Keywords

  • Energy dissipation capacity
  • Finite element method
  • Lateral peak displacement
  • Post-tensioning forces
  • Precast segmental columns

ASJC Scopus subject areas

  • Ocean Engineering
  • Automotive Engineering
  • Aerospace Engineering
  • Materials Science(all)
  • Civil and Structural Engineering
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

A numerical study on seismic response of self-centring precast segmental columns at different post-tensioning forces. / Nikbakht, Ehsan; Rashid, Khalim; Hejazi, Farzad; Osman, Siti Aminah.

In: Latin American Journal of Solids and Structures, Vol. 11, No. 5, 2014, p. 864-883.

Research output: Contribution to journalArticle

@article{1d861fb26ad44a77a20a54c958246fa2,
title = "A numerical study on seismic response of self-centring precast segmental columns at different post-tensioning forces",
abstract = "Precast bridge columns have shown increasing demand over the past few years due to the advantages of such columns when compared against conventional bridge columns, particularly due to the fact that precast bridge columns can be constructed off site and erected in a short period of time. The present study analytically investigates the behaviour of self-centring precast segmental bridge columns under nonlinear-static and pseudo-dynamic loading at different prestressing strand levels. Self-centring segmental columns are composed of prefabricated reinforced concrete segments which are connected by central post-tensioning (PT) strands. The present study develops a three dimensional (3D) nonlinear finite element model for hybrid post-tensioned precast segmental bridge columns. The model is subjected to constant axial loading and lateral reverse cyclic loading. The lateral force displacement results of the analysed columns show good agreement with the experimental response of the columns. Bonded post-tensioned segmental columns at 25{\%}, 40{\%} and 70{\%} prestressing strand stress levels are analysed and compared with an emulative monolithic conventional column. The columns with a higher initial prestressing strand levels show greater initial stiffness and strength but show higher stiffness reduction at large drifts. In the time-history analysis, the column samples are subjected to different earthquake records to investigate the effect post-tensioning force levels on their lateral seismic response in low and higher seismicity zones. The results indicate that, for low seismicity zones, post-tensioned segmental columns with a higher initial stress level deflect lower lateral peak displacement. However, in higher seismicity zones, applying a high initial stress level should be avoided for precast segmental self-centring columns with low energy dissipation capacity.",
keywords = "Energy dissipation capacity, Finite element method, Lateral peak displacement, Post-tensioning forces, Precast segmental columns",
author = "Ehsan Nikbakht and Khalim Rashid and Farzad Hejazi and Osman, {Siti Aminah}",
year = "2014",
language = "English",
volume = "11",
pages = "864--883",
journal = "Latin American Journal of Solids and Structures",
issn = "1679-7817",
publisher = "Brazilian Association of Computational Mechanics",
number = "5",

}

TY - JOUR

T1 - A numerical study on seismic response of self-centring precast segmental columns at different post-tensioning forces

AU - Nikbakht, Ehsan

AU - Rashid, Khalim

AU - Hejazi, Farzad

AU - Osman, Siti Aminah

PY - 2014

Y1 - 2014

N2 - Precast bridge columns have shown increasing demand over the past few years due to the advantages of such columns when compared against conventional bridge columns, particularly due to the fact that precast bridge columns can be constructed off site and erected in a short period of time. The present study analytically investigates the behaviour of self-centring precast segmental bridge columns under nonlinear-static and pseudo-dynamic loading at different prestressing strand levels. Self-centring segmental columns are composed of prefabricated reinforced concrete segments which are connected by central post-tensioning (PT) strands. The present study develops a three dimensional (3D) nonlinear finite element model for hybrid post-tensioned precast segmental bridge columns. The model is subjected to constant axial loading and lateral reverse cyclic loading. The lateral force displacement results of the analysed columns show good agreement with the experimental response of the columns. Bonded post-tensioned segmental columns at 25%, 40% and 70% prestressing strand stress levels are analysed and compared with an emulative monolithic conventional column. The columns with a higher initial prestressing strand levels show greater initial stiffness and strength but show higher stiffness reduction at large drifts. In the time-history analysis, the column samples are subjected to different earthquake records to investigate the effect post-tensioning force levels on their lateral seismic response in low and higher seismicity zones. The results indicate that, for low seismicity zones, post-tensioned segmental columns with a higher initial stress level deflect lower lateral peak displacement. However, in higher seismicity zones, applying a high initial stress level should be avoided for precast segmental self-centring columns with low energy dissipation capacity.

AB - Precast bridge columns have shown increasing demand over the past few years due to the advantages of such columns when compared against conventional bridge columns, particularly due to the fact that precast bridge columns can be constructed off site and erected in a short period of time. The present study analytically investigates the behaviour of self-centring precast segmental bridge columns under nonlinear-static and pseudo-dynamic loading at different prestressing strand levels. Self-centring segmental columns are composed of prefabricated reinforced concrete segments which are connected by central post-tensioning (PT) strands. The present study develops a three dimensional (3D) nonlinear finite element model for hybrid post-tensioned precast segmental bridge columns. The model is subjected to constant axial loading and lateral reverse cyclic loading. The lateral force displacement results of the analysed columns show good agreement with the experimental response of the columns. Bonded post-tensioned segmental columns at 25%, 40% and 70% prestressing strand stress levels are analysed and compared with an emulative monolithic conventional column. The columns with a higher initial prestressing strand levels show greater initial stiffness and strength but show higher stiffness reduction at large drifts. In the time-history analysis, the column samples are subjected to different earthquake records to investigate the effect post-tensioning force levels on their lateral seismic response in low and higher seismicity zones. The results indicate that, for low seismicity zones, post-tensioned segmental columns with a higher initial stress level deflect lower lateral peak displacement. However, in higher seismicity zones, applying a high initial stress level should be avoided for precast segmental self-centring columns with low energy dissipation capacity.

KW - Energy dissipation capacity

KW - Finite element method

KW - Lateral peak displacement

KW - Post-tensioning forces

KW - Precast segmental columns

UR - http://www.scopus.com/inward/record.url?scp=84892689474&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84892689474&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:84892689474

VL - 11

SP - 864

EP - 883

JO - Latin American Journal of Solids and Structures

JF - Latin American Journal of Solids and Structures

SN - 1679-7817

IS - 5

ER -