Clay J. Naito, Ph.D., P.E.
Associate Professor and Associate Chair
Dept. of Civil and Environmental Engineering

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Current Research:

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

Development of a Welding Procedure Specification for Field Welding of Precast Concrete Connections

Use of Polyurea for Blast Hardening of Concrete Construction

Estimation of Concrete Respone Under Varying Confinement

Evaluation of Bond Mechanics in Prestressed Concrete Applications

Horizontal Shear Capacity of Composite Beams Without Ties

Lateral Resistance of Plywood and Oriented Strand Board Sheathing After Accelerated Weathering

Past Research Projects

Performance of Bulb Tees with Self Consolidating Concrete

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

PCI Research Project: Development of an Inelastic Design Methodology for Precast Floor Diaphragms
University of Arizona, Lehigh University, University of California San Diego
Robert Fleischman, Clay Naito, Jose Restrepo, Richard Sause

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Lehigh University Task:
Development of Design Procedures for Precast Panel Diaphragm Connections

Background:
As a consequence of the Northridge Earthquake a number of precast concrete parking structures were damaged. The unexpected poor performance of these structures has led to a number of questions on the suitability of current design practices for seismic regions. To address this concern I am working on a collaborative research project to develop a comprehensive, accurate, and efficient design methodology for precast concrete floor diaphragms in buildings under seismic loading. The project is being conducted with a consortium comprised of the University of Arizona (UA), the University of California San Diego (UCSD), and Lehigh University (LU), together with the Precast/Prestressed Concrete Institute (PCI). Closely integrated experimental and analytical simulations are being used to significantly advance knowledge of the seismic behavior of precast floor diaphragms and develop information on the stiffness, strength, and ductility capacity of critical precast diaphragm elements. Integrating these results with industry knowledge, the project will produce an appropriate seismic design methodology. The Lehigh Task Group intends to study diaphragm connection details, which will lead to development of a standard and reliable seismic design method for connections. Single panel-to-panel connector tests will be conducted as our starting point of this program.

Researchers:
Clay Naito, Principal Investigator
Richard Sause, Co-Principal Investigator
Liling Cao, Doctoral Student Researcher
Wesley Peters, Graduate Student Researcher


Publications:
1. Naito, C., Cao, L., “Precast Diaphragm Panel Joint Connector Performance,” Paper 2722, Proceedings 13th World Conference on Earthquake Engineering, Vancouver, Canada, August, 2004.

2. R. Fleischman, J. Restrepo, R. Sause, C. Naito and S. K. Ghosh, "Development of a seismic design methodology for precast diaphragms", to be published in the proceedings of 13th World Conference on Earthquake Engineering, Vancouver, B.C., Canada, Aug. 2004

3. R. Fleischman, J. Restrepo, R. Sause, C. Naito, and S.K. Ghosh, "Development of a Seismic Design Methodology for Precast Diaphragms", to be published in the proceedings of SEAOC Convention, Monterey, CA, Aug. 2004

4. Abstract accepted by 2004 ACI National Conference, SF, CA, Oct. 2004

Sponsors:
Precast/Prestressed Concrete Institute
National Science Foundation
Pennsylvania Infrastructure Technology Alliance
High Concrete Strucutres
Ivy Steel and Wire
Metromont Precast

Page Last Updated Monday, 17-Sep-2007 10:11:41 EDT