Cyclic Behavior of Repaired Earthquake-Damaged Post-Tensioned Precast Columns


Abstract eng:
Post-tensioned precast concrete columns are known to have re-centering capability for seismic actions. This paper presents cyclic behavior of repaired precast concrete columns which experienced lateral movement up to drift level of 8%. The damage by the lateral load was repaired by removing cover concrete and thickening by high performance fiber reinforced cementitious composite. Strengthening part had additional details of chemical anchors into the foundation. Additionally provided transverse reinforcing bars in the thickened concrete showed significant effect on failure mode. When the posttensioned precast columns do not have tendon fracture by lateral load, the proposed strengthening method enhanced structural performance in terms of maximum strength, deformation capacity and energy dissipation capacity. The repaired columns showed more than 30% increase of flexural strength and 1.45 times higher cumulative energy dissipation capacity than the original precast columns. Design recommendations are summarized using the experimental results.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 184.:
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