Long-Term Performance of Seismically Rehabilitated Corrosion -Damaged Columns
Aquino, Wilkins
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Permalink
https://hdl.handle.net/2142/83192
Description
Title
Long-Term Performance of Seismically Rehabilitated Corrosion -Damaged Columns
Author(s)
Aquino, Wilkins
Issue Date
2002
Doctoral Committee Chair(s)
Hawkins, Neil M.
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Language
eng
Abstract
This project investigated the long-term seismic performance in cold regions of corroded reinforced concrete columns that are repaired using advanced composite materials (ACM). Although the success of ACM in upgrading the structural response of reinforced concrete columns has been established in the past, the long-term durability of structures retrofitted with these materials is not well known. In addition, the effectiveness of using ACM to restore the structural capacity of corrosion-damaged reinforced concrete columns with lap-spliced reinforcement and subjected to lateral loading needs to be addressed. In order to simulate environmental conditions, circular reinforced concrete columns (500 mm in diameter and 3000 mm in height) were deteriorated by inducing accelerated corrosion using external currents and then repaired with different layouts of carbon composite material. The repaired columns, along with smaller scale specimens, were subjected to 47 freeze-thaw cycles. Damage at the concrete-carbon composite interface due to freeze-thaw was assessed using non-destructive methods and structural testing. The efficiency of using ACM to upgrade corrosion-damaged columns was investigated through lateral cyclic loading tests. It was found that freeze-thaw cycles did not have any effect on the mechanical response of the retrofitted system. In addition, it was determined that corrosion-damaged columns can be successfully retrofitted using advanced composites. Moisture distribution during drying in concrete wrapped with carbon composite bands was investigated using non-linear finite element techniques and relative humidity measurements. When a banded layout was used, it was observed that the width of the composite bands controls the migration of moisture from the covered areas. In addition, it was found that the spacing of the bands, within practical limits, had little or no effect on the rate of moisture movement from the covered areas.
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