Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Concrete columns with internal bars made of glass fibers can make a building sturdier

16.07.2009
The University of Miami, through its NSF Industry/University Cooperative Research Center RB2C performed the first-ever tests of full-scale concrete columns internally reinforced with glass fiber reinforced polymer bars

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:

The GFRP vertical bars are not detrimental for the concrete column performance.

The contribution of the GFRP to the column capacity is very small, if the amount of longitudinal reinforcement is used. Therefore, the presence of the GFRP bars can be neglected in the computation of the ultimate column capacity.

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!
Further information:
http://www.miami.edu

More articles from Studies and Analyses:

nachricht Reusable carbon nanotubes could be the water filter of the future, says RIT study
30.03.2017 | Rochester Institute of Technology

nachricht Pan-European study on “Smart Engineering”
30.03.2017 | IPH - Institut für Integrierte Produktion Hannover gGmbH

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A Challenging European Research Project to Develop New Tiny Microscopes

The Institute of Semiconductor Technology and the Institute of Physical and Theoretical Chemistry, both members of the Laboratory for Emerging Nanometrology (LENA), at Technische Universität Braunschweig are partners in a new European research project entitled ChipScope, which aims to develop a completely new and extremely small optical microscope capable of observing the interior of living cells in real time. A consortium of 7 partners from 5 countries will tackle this issue with very ambitious objectives during a four-year research program.

To demonstrate the usefulness of this new scientific tool, at the end of the project the developed chip-sized microscope will be used to observe in real-time...

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

'On-off switch' brings researchers a step closer to potential HIV vaccine

30.03.2017 | Health and Medicine

Penn studies find promise for innovations in liquid biopsies

30.03.2017 | Health and Medicine

An LED-based device for imaging radiation induced skin damage

30.03.2017 | Medical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>