Conventional means of internal reinforcement for concrete member in buildings involve steel bars. Yet for structures that function in harsh environments like coastal regions, or for structures that support sensitive equipment, such as magnetic resonance imaging units; the use of fiber reinforced polymer (FRP) is emerging as a valuable option, due to its natural resistance to corrosion, its high strength, light weight, transparency to electrical and magnetic fields and ease of manufacturing and installment.
However, little has been done to study the performance of concrete columns reinforced with FRP bars. Currently the American Concrete Institute, a nonprofit technical and educational society and one of the world's leading authorities on concrete technology, does not address the use of FRP bars for reinforcement in columns, but welcomes additional relevant research and experimental evidence.
Full-scale experiments are critical to validate the technology, and to produce compelling evidence that underpins rational design methodologies. To address this need, the National Science Foundation (NSF) Industry/University Cooperative Research Center "Repair of Buildings and Bridges with Composites" (RB2C) at the University of Miami (UM) examined the behavior of concrete (RC) columns internally reinforced with glass FRP (GFRP) bars on full-scale specimens for the first time ever.
The new study demonstrates that the behavior of GFRP-RC columns was very similar to that of the conventional steel counterpart. The results of this project will be presented by Antonio De Luca, graduate student at the University of Miami College of Engineering, during the 9th International Symposium on Fiber Reinforced Polymer Reinforcement for Concrete Structures, in Sydney Australia, on July 13-15.
"The outcomes of our study provide a compelling case to modify existing design guidelines and allow for limited use of GFRP bars in columns, particularly when corrosion resistance or electromagnetic transparency is sought," De Luca said.
Other important findings of this project include:
Difference in manufacturer of the GFRP bars does not affect the performance when bars are of the same quality.
Use of GFRP bars as compression reinforcement may be allowed when design is for vertical loads only.
The next stage of the study is meant to demonstrate that specimen scale does not affect GFRP-RC column specimen performance; and to investigate the behavior of GFRP-RC column specimens subjected to compressive load applied with a small eccentricity.
The University of Miami's mission is to educate and nurture students, to create knowledge, and to provide service to our community and beyond. Committed to excellence and proud of the diversity of our University family, we strive to develop future leaders of our nation and the world.
Marie Guma-Diaz | EurekAlert!
Disarray in the brain
18.12.2017 | Universität zu Lübeck
Amputees can learn to control a robotic arm with their minds
28.11.2017 | University of Chicago Medical Center
A study carried out by an international team of researchers and published in the journal Physical Review X shows that ion-trap technologies available today are suitable for building large-scale quantum computers. The scientists introduce trapped-ion quantum error correction protocols that detect and correct processing errors.
In order to reach their full potential, today’s quantum computer prototypes have to meet specific criteria: First, they have to be made bigger, which means...
Since 2016, German and Spanish researchers, among them scientists from the University of Göttingen, have been hunting for exoplanets with the “Carmenes”...
DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.
Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
18.12.2017 | Life Sciences
18.12.2017 | Materials Sciences
18.12.2017 | Life Sciences