Roy L. Eriksson, P.E. President Eriksson Technologies, Inc.

Education

• B.S., Civil Engineering (structures emphasis), University of Florida, 1982
• M.S., Civil Engineering (structures emphasis), University of South Florida 1989
• Additional Course Work: 21 credits towards MBA, University of South Florida, 1984-6

Professional Affiliations

• Precast/Prestressed Concrete Institute (PCI):
    - Chair, Bridge Technical Committee 1999-2003
    - LRFD Subcommittee
    - Bridge Design Manual Steering Committee
    - PCI Bridge Producers Committee
    - Prestress Losses Subcommittee

Professional Registrations

• Florida (PE 40107)

Key Qualifications

Roy Eriksson has over 20 years of experience in structural engineering and engineering software development. Roy has been responsible for structural engineering for a variety of projects using precast/prestressed and post-tensioned concrete, cast-in-place concrete, and structural steel.  Project types include new construction, expansion, and failure investigations of bridges and commercial structures. He has extensive experience with the AASHTO LRFD specifications, which includes software development, development of a comprehensive LRFD training course, conducting LRFD workshops and seminars, and industry committee involvement.  He also has project design experience using the LRFD Specifications.

Selected Bridges

International Boulevard Viaduct, Fulton Co., Georgia: Rendered construction engineering services to the fabricator. Prepared redesign calculations and prepared the shop drawings for these twin 12-span, highly asymmetrical structures. Challenges included flaring spans, high girder end skews, girder end batters, grade effects, and other difficult geometry.

Central Artery, Boston, Massachusetts: served as lead engineer and project manager for development of a series of standardized bridges. The bridge superstructures consist of four types: adjacent precast/prestressed concrete boxes, longitudinal Inverset units, exodermic deck on steel stringers, and precast/prestressed concrete deck units on steel stringers. The substructures consist of concrete and steel options, founded on drilled shafts. Complete plans and specifications were developed for the project.

Hallandale Beach Flyover Ramp, Hallandale Beach, Florida: served as lead engineer and project manager for a curved, post-tensioned concrete box girder flyover ramp. With span lengths ranging from 40 meters (131 feet) to 57 meters (187 feet), this four-span highly-curved (R = 65.000 m, D = 89 degrees) structure with phased construction presented numerous design challenges: Primary longitudinal reinforcement consists of post-tensioning tendons with parabolic profiles. Primary transverse deck reinforcement consists of straight post-tensioning tendons. Pier diaphragms were reinforced with vertically-oriented post-tensioning tendons and post-tensioning bars. Interior piers where designed to be integrally connected to the box girder superstructure to improve aesthetics due to the highly-urbanized locale of the project, and to improve serviceability by eliminating bearings at those piers. Detailing of the integral piers required extremely close attention to detail to minimize the potential for reinforcement conflicts.

Charles River Bridge, Boston, Massachusetts: project manager and integral member of a team for a special investigation of this asymmetric cable-stayed segmental concrete bridge consisting of eight inboard lanes and two outboard lanes of traffic. The investigation was requested by the Federal Highway Administration.  It required the use of sophisticated three-dimensional finite element modeling techniques using plates, 3-D beam elements, and 3-D truss elements. Roy also performed modeling and analysis of the overall bridge. The bridge's main span is 745 feet and the back spans are 275 feet and 420 feet.

Harbour Island Peoplemover, Tampa, Florida: served as project engineer for this composite precast prestressed concrete box girder guide way.   The structure consisted of several three and four-span continuous units.  One unit consisted of three spans with the main span constructed using a girder splicing technique.  For the spliced span, two 70-foot box segments, reinforced with pretensioned strands for handling and construction loads, were erected over active traffic on a falsework tower, and were connected using a wet-cast joint.  The segments were then post-tensioned together, creating a single 140-foot box beam.

• 2002 Precast/Prestress Concrete Institute (PCI) National Design Awards Judge
• Elected a Professional Associate of Parsons Brinckerhoff; March, 1996
• Technical Writing Awards: Merit (1993), Excellence (1991), and Merit (1991), Technical Writing Competition(s), Society for Technical Communication

Research

Roy Eriksson is co-principal investigator of NCHRP Project 12-69, “Design and Construction Guidelines for Long-Span Decked Precast, Prestressed Concrete Girder Bridges”. This research project is currently in progress. Notice to proceed on this $500,000 project was given on June 1, 2004 with a duration of 36 months.

Selected LRFD Teaching Experience

 “Bridge Design Seminar”, Design seminar for Montana DOT bridge engineers and their consultants (4.5 hrs total instruction time). Topics covered by Mr. Eriksson included: LRFD issues (shear design, exterior girder design, and code requirements), strut-and-tie modeling, and continuous girder design. February 26, 2002, Helena, MT.

 “AASHTO LRFD Training Seminar”, developed course material and taught Concrete Bridges I & II modules (7 hrs total) covering LRFD principles, bridge superstructure design, substructure design, strut-and-tie modeling, and integral bridge design.  Part of 4-day seminar sponsored by Michael Baker Engineers for the WV DOT, FHWA, and consultants, August 1-4, 2000, Charleston, WV.

 “PCI Bridge Design Manual Seminar”, taught 3 hours covering design optimization, LRFD, and superstructure design.  Sponsored by Prestressed Concrete Producers of Arkansas, Little Rock, AR, August 8, 2000.

"PCI Bridge Design Manual Seminar", Co-presenter of full-day seminars to introduce the new comprehensive PCI Bridge Design Manual that were held for state bridge engineers and consulting engineers in Montana, Wyoming, Iowa, and Minnesota.  Presented the following sections of the manual which were largely LRFD based: Strategies for Economy, Loads, and Design Examples; February-March, 1998.

"1997 Load and Resistance Factor Design (LRFD) of Bridges", Developed presentation material for and participated in the presentation of the half-day concrete module of a series of two-day, intensive seminars sponsored by the Florida DOT and Florida Institute of Consulting Engineers, August-October, 1997. The purpose of the seminars was to prepare Florida bridge engineers for statewide adoption of LRFD in 1998.

"LRFD Bridge Design Workshop: Overview of the AASHTO LRFD Bridge Design Specifications and Concrete Bridge Design", Conducted full-day workshop for the Florida DOT, January 17, 1997.

"Introduction to LRFD and Concrete Design Examples", co-presented seminar with Florida DOT engineers at the FDOT Design Conference '96, Orlando, FL; August 13, 1996.

"LRFD Bridge Design Workshop: Overview of the AASHTO LRFD Bridge Design Specifications and Concrete Bridge Design", Conducted workshop for the Maryland State Highway Administration; November 30, 1995.

"Design Examples for Prestressed Concrete Girder Bridges"; Co-presenter of half-day design seminar on new AASHTO LRFD Specification; 1995 International Bridge Conference; Pittsburgh, PA; June 20, 1995.

“Splice Girder Bridges: An Overview”, Joint meeting of FCC-OSPE, ASHE, & ASCE, Columbus, OH; November 29, 2001.

Eriksson, Roy L., "Implementing LRFD: Lessons Learned"; AASHTO Subcommittee on Bridges and Structures; Jackson, WY; June 11, 1997.

Eriksson, Roy L. "Lessons Learned So Far in Designing Concrete Bridges in Accordance with LRFD", Transportation Research Board (TRB) Seventy-Sixth Annual Meeting, Washington, D.C., January 15, 1997.

Eriksson, Roy L., "The Bottom Line: Effect of LRFD on Typical Designs"; 1995 PCI Convention; Reno, NV; October 16, 1995.

Training Courses

LRFD Training Course: awarded a research grant by Parsons Brinckerhoff (1995) to develop a training course for the AASHTO LRFD Bridge Design Specifications. An overview and technical summary of the LRFD specifications were prepared along with a series of detailed design examples. Course materials developed consisted of a comprehensive participant’s notebook plus presentation materials.

FDOT LRFD Seminar – Developed the concrete module for Florida DOT’s statewide LRFD bridge design training (1997-8).

LRFD Training: Principles & Practice – Intensive LRFD-based training course developed and largely executed by Roy Eriksson. This course provided the the engineering theory and practical application of highway bridge design in accordance with the AASHTO LRFD Bridge Design Specications. Topics covered include deck design, prestressed girder design, substructure design, and foundation analysis and design. The course was held in Tampa, Florida on March 5, 2004 (27 engineers in attendance) and in Springfield, Illinois on June 4, 2004 (40 engineers in attendance).

PCI Bridge Design Manual; PCI; Chicago, IL; 2003; Revised and updated Chapter 9, which contains eight complete, detailed design examples. This publication was originally published in 1997. The scope of the updating services provided by Eriksson included correcting errata identified since publication of the first edition, correction of other errors, and substantial reworking (e.g., the shear sections of the LRFD examples) due to recent AASHTO Specification changes.

State of the Art of Precast/Prestressed Integral Bridges; PCI; Chicago, IL; 2001; Served as Editor-in-Chief; The draft of this publication was prepared by the Integral Bridges Subcommittee of PCI. Eriksson edited the manuscript and prepared final drawings and artwork and all related prepress work.

Eriksson, Roy L., principal author and editor-in-chief, "Parsons Brinckerhoff Software Development Manual", Parsons Brinckerhoff; New York; 1998.

Eriksson, Roy L.; Participants notebook for FDOT/FICE LRFD Bridge Design Seminar Series: "Concrete Bridge Design in accordance with AASHTO LRFD", 1997.

Eriksson, Roy L.; "LRFD Bridge Design Seminar Series: Overview of the AASHTO LRFD Specifications and Concrete Bridge Design", Parsons Brinckerhoff Office of Professional Practice, 1996.

Eriksson, Roy L. and Zendegui, Stephen; "Segmental Design of the Harbour Island People Mover," PCI Journal, Vol. 30, No. 4, July-August, 1985, pp. 38-51.

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