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

Contact Information
Links

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

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

Introduction:
The research program will investigate the resulting quality of welded connections fabricated under conditions simulating typical field welding conditions encountered in precast construction. The study will develop a welding procedure specification for field welding of precast concrete connections through laboratory evaluation of welded connections of commonly used steel grades fabricated under a range of environmental conditions. The range and limits of environmental conditions that produce acceptable quality connections will be determined and incorporated in the welding procedure specification. AWS standards will be used to determine weld quality. The study will be limited to -in. fillet welded connections commonly used in precast construction.

To develop the welding specification the research project is divided into four tasks:
o Task 1: Review of Current Code Requirements for Field Welding.
o Task 2: Development of Laboratory Experimental Program
o Task 3: Evaluation of Simulated Field Welds
o Task 3A: Initial Evaluation of Simulated Field Welds
o Task 3B: Final Evaluation of Simulated Field Welds
o Task 4: Complete Final Report

Project Update
The project was awarded by PCI in early 2006. The research project has been completed as of October 2007. The final report is available at the link below. Additional research is ongoing to examine the effects of falling water on the weld quality and to develop methods for welding through galvanized steel.

Researchers:
Richard Sause, Principal Investigator
Clay Naito, Co-Principal Investigator
Eric Kaufmann, Co-Principal Investigator
Jason Zimpfer, Graduate Student Researcher

Sponsors:
Precast/Prestressed Concrete Institute

Other Participants:
High Concrete Structures

Metromont

Publications:
ATLSS FINAL REPORT Download (19 Mb)

Page Last Updated Monday, 19-Nov-2007 13:00:42 EST