A new reinforcement, termed Prefabricated Cage System (PCS) to be used to reinforce concrete members is introduced. This new reinforcement is patent pending and is developed and evaluated in this research. PCS functions as both the longitudinal and transverse reinforcement connected monolithically and working compositely with the surrounding concrete to resist the applied loads. PCS is fabricated by perforating hollow steel tubes or steel plates.
PCS reinforcement is prefabricated off-site and then placed inside the formwork eliminating the time consuming and costly labor associated with cutting, bending, and tying steel bars in traditional rebar construction. PCS can be used to reinforce almost any kind of concrete member which involves reinforcement and concrete. PCS can be used as the entire or part of the reinforcement in concrete columns, beams, beam-column joints, shear walls, foundations, slabs, or other structural members.
This study investigates the behavior of PCS reinforced columns tested under monotonic axial load.
Small-scale columns with high strength concrete (HSC) and normal strength concrete (NSC) were constructed and tested to investigate the behavior of PCS reinforced columns. A total of 21 HSC specimens were tested to investigate confinement provided by PCS and strength and displacement capacity of PCS reinforced columns. Test results indicate that PCS provides higher confinement but comparable axial capacity as conventional rebar reinforcement. A total of 16 NSC column specimens were also tested to investigate the strength and displacement ductility of PCS reinforced columns. Test results indicate that PCS reinforced specimens have comparable peak strengths with higher displacement ductility and absorbed energy than similar rebar reinforced specimens.
A confinement model is defined for PCS reinforced members using the experimental test results. This confinement model is used to model the behavior of the tested specimens and to obtain theoretical axial load-displacement relationships.
The economic benefits gained from using PCS reinforcement are also investigated. The cost and time savings earned in structures with PCS reinforced columns have been modeled and evaluated in a case study. Results indicate that although the current production cost of PCS may be higher than rebar reinforcement, cost and time savings occur due to faster construction.
|School:||The Ohio State University|
|School Location:||United States -- Ohio|
|Source:||DAI-B 79/09(E), Dissertation Abstracts International|
|Subjects:||Civil engineering, Industrial engineering|
|Keywords:||Axial loading, Columns, PCS, Prefabricated cage system, Reinforced concrete, Reinforcement|
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