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STRUCTURE Magazine
October 2009 Bridges
Contents
FEATURES
18 Accelerated Bridge Construction Keeps Tappan Zee Bridge Open By Helena Tam, PE., Mohammad Shams, Ph.D., and Kenneth Standig, P.E. The New York State Thruway Authority held a Federal Highway Administration-sponsored Accelerated Construction Technology Transfer (ACTT) workshop in 2005 to affirm its approach to use prefabricated systems to quickly repair deteriorating bridge decks with minimum disruption to traffic. The FHWA selected the Tappan Zee Bridge as an ACTT project because of the immediate need for the repairs, the function of the bridge as a lifeline structure, and the limitations imposed by an unremitting high-volume traffic stream.
22 Creating the Ideal Bridge for Phoenix Sky Harbor's Taxiway Sierra By Ted Bush, P. S.E., Kent Bormann, P.E., S.E. and Rob Turton, P.E., S.E. A new five-span cast-in-place, post-tensioned concrete box girder underpass was recently constructed as part of a $35 million design-build project for the City of Phoenix. The project consisted of reconstructing Taxiway Sierra at Sky Harbor International Airport, which included replacing the taxiway pavement and the two single-span reinforced concrete rigid-frame structures.
COLUMNS
5 Editorial An Honest Living Douglas Ashcroft, P. S. E.
7 InFocus Does the Building Code Need Simplification? By Richard L. Hess, S.E., SECB
8 Structural Performance Tall Buildings and Structural Collapse By Dr. Gregory Szuladziriski, FIEAust
DEPARTMENTS
27 Spotlight 1-280 Veterans' Glass City Skyway By Daniel Meyer, PE. and Denney Pate, P.E.
10 Structural Forensics LTBP Program Moving Ahead By Dr. Hamid Ghasemi and John Penrod, PE.
14 InSights BIM Power: Interoperability By Andrew W Gayer, PE., S.E., LEED AP M. ASCE
IN EVERY ISSUE
28 NCSEA News
30 SEI Structural Columns
32 CASE in Point
34 Advertiser Index ON THE COVER
'~ The Cedar Avenue Pedestrian Bridge completes the final link between the Flagstaff Urban Trail System and the Arizona b - Trail System, and provides a safe crossing for hikers and bikers over a busy city street in northeast Flagstaff After reaching consensus through preliminary design studies, citizen's input and approval of the City Council, T.Y. Lin International, the prime designer, recommended a concrete variable depth cast-in-place, post-tensioned box girder. The bridge in its final form resembles a very graceful arch.
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