Research

Date	Title
2004	"Drilled Shaft Foundation for Noise Barrier Walls and Slope Stabilizations" Robert Liang, University of Akron
2004	"Introduction to Corrosion and Galvanizing of Helix Foundations." Howard A. Perko, Ph.D., PE.
2003	"Lateral Capacity and Buckling Resistance of Helix Pier Foundations." Howard A. Perko, PE
2003	"Design and Performance of Screw Piles and Helical Anchors in Soils" Alan J. Lutenegger
2001	"Energy Method for Predicting Installation Torque of Helical Foundations and Anchors." Howard A. Perko, PE
1997	"Use of ultimate load theories for design of drilled shaft sound wall foundations." Helmers, Duncan, & Filz. Virginia Tech
1997	"Deflections and Bending Moments in Drilled Shaft Sound Wall." Mokwa, Duncan, and Helmers.
1997	"Design Method for Drilled Shaft Sound Wall Foundations " Duncan, Helmers and Mokwa
1995	"Service Life, Allowable Reinforcement Stress And Metal Loss Rates To Be Used In The Design of Permanent MSE Structures." The Reinforced Earth Company.

Federal