Topic: Evaluation and Innovative Retrofit of the Washington Avenue Bridge in Minneapolis, MN (Earns 1.5 PDH)
Date: Thursday, September 27, 2012
Location: Municipal Services Building
16th Floor, Conference Rooms X & Y
1401 John F Kennedy Boulevard Philadelphia, PA 19102 (Get Directions)
*Discounted parking available. See below
Cost: members $40; non-members $45; students $15
Retrofit of the iconic Washington Avenue Bridge is proposed for the incorporation of light rail over the Mississippi River, a critical link in the 11 mile Central Corridor Light Rail Transit (CCLRT) Project connecting St. Paul and Minneapolis. The structure is a unique double-decker bridge carrying an upper-level pedestrian deck with an enclosed walkway and a lower level vehicular deck. The CCLRT Project proposes to replace one roadway lane in each direction to accommodate the LRT. Considered non-redundant and fracture-critical, the existing superstructure consists of dual girder-floor beam-stringer type framing with two non-composite and independent reinforced concrete decks. Originally built in 1965, the bridge incorporated innovations new to the bridge industry at the time of original construction, namely the use of high strength (100 ksi) quenched and tempered steel. An innovative retrofit proposes the installation of four new longitudinal trusses constructed within the existing superstructure cross section and a new full-width composite deck. Designed to match the stiffness of the existing girders, the new trusses effectively convert the existing dual two-girder system into a redundant eight “girder” composite superstructure. Advanced structural and material analysis of the bridge was performed to meet the following project goals: (1) provide a functional structure for its proposed usage including light rail, (2) provide a redundant superstructure, (3) provide a structural system reliable against fatigue and fracture, and (4) provide a structure that meets LRFD design criteria for a 75 year design life.
Sougata Roy, Ph.D.: Sougata Roy is a Principal Research Scientist with the ATLSS Engineering Research Center, at Lehigh University. Sougata received a Baccalaureate degree in Civil Engineering from the University of Calcutta in India, and Masters and Doctoral degrees in Civil Engineering from Lehigh University. Dr. Roy is an expert in Structural Engineering with specialization in Fatigue and Fracture of Steel Structures. He is leading funded research in System Performance Evaluation, Deterioration and Damage Assessment, Failure Analysis, Forensic Studies and Life Cycle Prediction of Bridge and Highway Infrastructure, including simulation of large systems by advanced Finite Element Analysis, laboratory experiments and field measurements. In addition, Dr. Roy teaches undergraduate and graduate level courses on Bridge System Design, and Fatigue and Fracture of Steel Structures at Lehigh, and supervises doctoral, masters and undergraduate students with the Department of Civil and Environmental Engineering. In addition to more than 13 years’ experience in the academia, Sougata worked 11 years in structural engineering consultancy designing and managing large bridge projects. Dr. Roy is an active member of national committees including TRB AFH70: Metal Fabrication Committee; and AISI/NSBA Design Advisory Group/Bridge Task Force, and ASCE/SEI Fatigue and Fracture Committee (current Chair).
John Milius, P.E.: John Milius has broad experience as a structural engineer for the design and construction of a wide range of structures for the transportation industry. He is experienced in the design of steel, reinforced and prestressed concrete, and timber structures. John is accomplished in the analysis and design of a wide range complex highway and railroad bridges and is practiced in construction consultation and inspection of complex structures. He has written and presented numerous technical papers for industry publications and conferences. Mr. Milius is currently leading some of AECOM's high profile bridge design and rehabilitation projects and also serves as the Structures Department Manager in the AECOM Philadelphia office. John holds a Bachelor of Science in Civil Engineering from Bucknell University, a Masters of (Structural) Engineering from Cornell University, and a MBA from Villanova University.
5:30 - 6:15 Social and Registration
6:15 - 7:00 Box Dinner (chicken/tuna/vegetarian wraps - please note preference in your response)
7:00 - 8:30 Program
Please email Dr. Nazhat Aboobaker at firstname.lastname@example.org by 9/25/12.
Cash or check at the door, or mail to SEI Treasurer Khalid Shaikh, c/o Invision Engineers, 16 Manley Road, Pennington, NJ 08534.
Make checks payable to SEI-Phila Chapter.
Parking is available for only $5.00 after 5 PM at intersection of 15th and Vine Street. Request a voucher at the meeting.
♦ Become involved: contact Dr. Aboobaker if you are interested in Board or Committee
♦ Give a presentation: contact any of the Board members if you have a topic to offer.