[Archived] Appendix B (continued) - New York - ACTT - Accelerated - Technologies and Innovations - Construction

ACTT Workshop: New York
Tappan Zee Bridge Deck Replacement

Structures Team
Facilitator:	Michael P. Culmo
William F. McEleney Steve Stroh Al Mangus Raymond McCabe	Gary F. Tatro Scott D. Harrigan Richard Iuele Stephen Grabowski	Vasant Mistry John Burns Daniel Byer Richard Marchione

Idea (Short Name)	Idea (Detailed Description)	Implementation Details (Barriers, Skill Set Coordination, etc.)
ALTERNATIVE 1	No build.
ALTERNATIVE 2a	Do one span - 1 piece (50 feet x 50 feet).	Faster? No long joints. Uniform beam spacing.
ALTERNATIVE 2b	Do one piece - two span.	Faster. Less transverse joints. Dead load distribution. Lightweight concrete. Grade 50 steel - rolled beams.
ALTERNATIVE 2c	Replace deck truss.	Continuous stringer. 75-foot segment. Non-composite. Possible deck replacement. Exodermic. Possible deck with stringers.
ALTERNATIVE 3		Difficult with composite deck. Probably won't work. $$$.
ALTERNATIVE 4	Work at multiple locations at once.
ALTERNATIVE 5	Build a parallel structure.	No significant traffic. Could be less expensive. Environmental issues. Faster?
ALTERNATIVE 6	Construct a temporary bridge above existing bridge (eight to 10 feet above deck).	All work takes place UNDER traffic. Minimal traffic control.
ALTERNATIVE 7	Do a lightweight structural overlay.
ALTERNATIVE 8	Consider orthotropic.
ALTERNATIVE 9	Construct an FRP deck on stringers.