“Seismic Retrofit
of the
I-90/South Bellevue Way Interchange”
by
Kare Hjorteset & Scott McMahon
BERGER/ABAM Engineers Inc.
 
Abstract
BERGER/ABAM was hired by WSDOT (Washington Department of Transportation) to prepare Design Criteria and to perform Elastic Response Spectrum Analysis and Pushover Analysis in order to determine the extent of Seismic retrofit required for the I-90/South Bellevue Way Interchange.  In the initial study Ramp 90/43 W-N of the interchange was modeled.  This ramp is a tight horizontal radius bridge with 17 spans partly supported on relative firm sand and mostly supported on severely soft peat.  The same GT STRUDL model was used in both the Elastic Response Spectrum Analysis and the Pushover Analysis.

The following topics will be discussed during the presentation:

  1. Overview of the project.
  2.  Design Criteria
  3.  Elastic Response Spectrum Analysis
  4.  Pushover Analysis
  5.  Description of final Seismic Retrofit Procedure.
Biographical Data
 
Mr. Hjorteset is a project engineer for BERGER/ABAM Engineers Inc. with over 16 years of experience.  Previously, he worked 4 years with Berdal Str mme A.S. and Veritec A.S. in Norway.  His professional experience includes design, analysis, inspection, cost estimating, and field engineering.  Projects include buildings, transit, marine, and offshore structures.

Education
MS  Civil and Structural Engineering, University of Washington, 1990
MS  Civil Engineering, The Norwegian Institute of Technology, 1985
 

Biographical Data

Mr. Scott McMahon is a Senior Engineer with BERGER/ABAM Engineers Inc. in Portland, OR.   Eight years engineering experience, primarily with bridges and waterfront structures.  Registered PE in Indiana and Washington.

Education

BS and MS Civil Engineering from University of Notre Dame
To view the entire presentation on-line select the following PowerPoint Presentation file:

BERGER/ABAM_2002.ppt
Date: 6/21/2002 
Size:  14,540KB