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Contact Information
Links
Current Research:
EIT Demonstration Project and Workshop
NSF: Development of a Blast and Ballistic Resistant Precast Concrete Armored Wall System
NEES-CR: Impact Forces from Tsunami-Driven Debris
Inspection Methods & Techniques to Determine Non Visible Corrosion of Prestressing Strands in Concrete Bridge Components
Daniel P. Jenny PCI Fellowship: Analytical Assessment of the Resistance of Precast Strucutres to Blast Effects
Development of a Seismic Design Methodology for Precast Diaphragms
Use of Polyurea for Blast Hardening of Concrete Construction
Estimation of Concrete Respone Under Varying Confinement
Past Research Projects
Performance of Bulb Tees with Self Consolidating Concrete
Evaluation of Bond Mechanics in Prestressed Concrete Applications
FRP Bridge Decks with RC
Parapets
Blast Resistance of a Load
Bearing Shear Wall Building
Lehigh@NEES
Equipment Site
Reserarch Experinece for
Undergraduates
Seismic Evaluation of a Three Story
WoodFrame Apartment Building with Tuck-Under Parking
Design of RC Bridge Beam-Column
Connections
Response of Waffle Slab
Building Systems to Seismic Loads
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Experimental Evaluation of Concrete Confined with Varying Pressure and
Development of Behavioral Characteristics of Confined Concrete
Background:
In regions of high seismicity reinforced concrete plays a
vital role in providing a safe structural environment. The
confining action of concrete provides structural members with resistance to the elevated demands
imposed by earthquakes. To improve the economy of new and rehabilitative design
strategies the engineer must be able to accurately predict the response of reinforced
concrete under these demands. This starts with a clear undersanding of the stress-strain
behavior of confined concrete.
From the available literature, it is seen that the analytical models
used for the
prediction of axial stress-strain behavior of confined concrete are often based
on constant confining pressure. It is experimental tests on concrete confined by
Fiber Reinforced Polymer (FRP) jackets this is shown to be untrue. This is due to the
characteristics of jacketing materials, which apply
variable confining stresses as the concrete dilates. To address this
deficiency variable confinement models have been
developed. These models, however, also lack consistency in providing accurate
predictions.
To develop improved modeling techniques a experimental and analytical research
program is being conducted. The experimental research program examines the effect of
jacketing on concrete columns under axial load. The response of glass and carbon FRP and
steel jacketed concrete will be compared to the performance of concrete under tri-axial
stress distributions. From these studies exisiting models will be examined and new
models will be developed.
Researchers:
Clay Naito, Principal Investigator
Fatih Cetisli, Doctoral Student Researcher
Publications:
1. Naito, C., Cetisli, F., "Accuracy Improvements for Variable and Constant Confinement Concrete Models," Proceedings
International Symposium on Confined Concrete, Changsha, China, June, 2004.
2.Cetisli, F. and Naito C.J., 2003, "State of the Art of Analytical Prediction for Confined
Concrete," ATLSS Report, Lehigh University, No. 03-24, October, 104 pp.
Sponsors:
Pennsylvania Infrastructure Technology Alliance
Other Participants:
Republic of Turkey, Ministry of National Education
Page Last Updated Thursday, 05-Aug-2004 10:11:31 EDT
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