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DC Department of Transportation (DDOT) I-295 over South Capitol Street Bridge Rehabilitation (Bridge 1016 NB & 1017 SB)

This is a past event.

Thursday, July 21, 2022 at 1:00pm

Virtual Event

The District Department of Transportation (DDOT) needed an innovative solution to upgrade the deteriorated Anacostia Freeway (I-295) bridges over South Capitol Street in Washington, DC. With high traffic counts on this key commuter route, minimizing the construction schedule was a primary objective. DDOT tasked Johnson, Mirmiran & Thompson, Inc. (JMT) with developing the solution. Because the bridge substructures remained usable, JMT proposed replacing the superstructure with precast modular deck units comprised of steel plate girders, tied together with a UHPC closure pour. The new bridge superstructures were designed to fit within the geometric constraints of the heavily skewed existing substructures. The steel girders topped with concrete deck were fabricated in a controlled environment before each modular unit was shipped to the construction site. Installation and construction were completed in 2018 in several phases on each bridge using temporary weekend detours. By applying ABC principles and meticulously planning the proposed weekend construction sequences, the project was completed within six months, minimally impacting regular motorists on their daily commutes. This presentation includes design and construction details and lessons learned.

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