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Earthquakes and Structures
  Volume 8, Number 6, June 2015, pages 1277-1297

Evaluating seismic demands for segmental columns with low energy dissipation capacity
Ehsan Nikbakht, Khalim Rashid, Iman Mohseni and Farzad Hejazi

    Post-tensioned precast segmental bridge columns have shown high level of strength and ductility, and low residual displacement, which makes them suffer minor damage after earthquake loading; however, there is still lack of confidence on their lateral response against severe seismic loading due in part to their low energy dissipation capacity. This study investigates the influence of major design factors such as post-tensioning force level, strands position, columns aspect ratio, steel jacket and mild steel ratio on seismic performance of self-centring segmental bridge columns in terms of lateral strength, residual displacement and lateral peak displacement. Seismic analyses show that increasing the continuous mild steel ratio improves the lateral peak displacement of the self-centring columns at different levels of post-tensioning (PT) forces. Such an increase in steel ratio reduces the residual drift in segmental columns with higher aspect ratio more considerably. Suggestions are proposed for the design of self-centring segmental columns with various aspect ratios at different target drifts.
Key Words
    post-tensioning; precast segmental columns; earthquake loading; finite element method (FEM); lateral seismic demand; residual displacement
Ehsan Nikbakht, Khalim Rashid, Iman Mohseni and Farzad Hejazi: Department of Civil and Structural Engineering, Universiti Kebangsaan Malaysia, 43600 Bangi, Malaysia

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