Tuhin Basu & Assoc., Inc. - Project: Cooper River Bridge

Project: Cooper River Bridge Replacement Design/ Build Project, Charlestown, SC for SCDOT

This prominent design-build bridge replacement project features the longest cable stay span in North America at
1546 feet and is the single largest infrastructure project in the State of South Carolina. The replacement bridge is
approximately 3 miles in length connecting the historic Charleston peninsula with the city of Mount Pleasant. The
structure includes major interchanges on the Charleston and Mount Pleasant sides of the channel.

As part of the Palmetto Bridge Constructors team,
Tuhin Basu & Associates, Inc. provided final design
services and prepared final construction plans for
ramps on Lines 11 & 16 in the Mount Pleasant
Interchange section of the project. Line 11 of this
project is a 12 span, 1640-foot long, variable width,
curved ramp structure with a 3,000-foot radius and
connects to the high-level approach spans of the
mainline structure. The Line 16 ramp structure is a
two span curved structure on a 364-foot radius and
connects to the Line 11 structure. The
superstructure of Lines 11 & 16 consists of
prestressed concrete girders made continuous for
live load and the substructure is comprised of single

column hammerhead bents and two-column bents,
several with post-tensioned bent caps. All
substructure units of Lines 11 and 16 are supported
on drilled shaft foundations and the structure was
designed for Seismic Performance Category D. The
span lengths are generally 140 feet in length. This
fast-track design-build project required extensive
coordination with the contractor and other members
of the design team. TBA also provided construction
support services for this project, such as shop
drawing reviews and responding to contractor RFI's.