Page 27 - Modern Steel Construction (April 2019)

Open

For

Design.

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above: Transporting massive curved sections below: Assembling a portion of the
to the site. superstructure in the shop.

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drel columns were varied to provide added stiffness in areas of the Vierendeel arch that
were determined to be most critical, while at the same time maintaining a lighter structure
where the spandrel columns had little influence. The spandrel column connections to the
tub girders were welded moment connections and were provided with internal stiffeners at
all locations. Although some spandrel columns did not require stiffeners to provide adequate
strength at the connections, this lack of stiffeners would provide a significantly more flexible
connection due to the width of the tub girder bottom flange—and this added flexibility
would have been detrimental to the dynamic performance of the bridge.
Piers and Tub Girders Powerful Partnerships.
The approach pier structures required a more balanced approach for dealing with vibra- Powerful Results.
tion and thermal forces. The piers were connected to the continuous tub girders using

Modern Steel Construction | 27
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