Long Span Bridges & Vibrations

Full Session with Abstracts

343155-1 - Clearfork Main Street Bridge – Two Bridges in One

Saturday, April 21
8:00 AM - 9:30 AM
Location: 102

Challenged by competing demands of limited budget, stringent flood control requirements, urban pedestrian trail connectivity, and an emphasis on bridge aesthetics, the Clearfork Main Street Bridge employed a concrete spliced girder system (the second in Texas and the first in 25 years) with a unique steel pedestrian bridge suspended below.
The vehicular bridge is composed of five beam segments spliced together with post-tensioning tendons to form one continuous three-span girder with a center span of 220 feet. Spliced girders combine the economy and durability of precast concrete beams with the long span capabilities and aesthetics of a continuous steel girder. The girder segments were constructed of readily available precast beam shapes, haunched at the columns for additional strength and reduced live load deflection.
As a more direct way to allow pedestrian trail users to cross the river, the team designed a trail–level pedestrian bridge suspended below the vehicular level. This pedestrian level connects to the two river banks at trail level, offering a shorter, shaded trip separate from the motor vehicle traffic. The pedestrian bridge is supported by tension-only hanger rods and, at midspan only, a set of steel pipe hangers to ensure enough torsional rigidity to prevent dangerous wind-excited bridge oscillations.
At each end of the pedestrian bridge, near the vehicular bridge abutments, the team designed plaza areas that serve as multi-nodal trail connections with tiered seat walls offering a shaded rest area for pedestrians and cyclists. The bridge abutments act as a canvas for large scale public artworks measuring 30 feet wide. These plazas, with their shaded seating and attractive public art, transform what is normally a neglected space to one that is a pedestrian refuge.
This presentation is targeted to a national audience of bridge design professionals

John F. Dewar

Vice President- North Texas Infrastructure Division Manager
Freese and Nichols, Inc.

Mr. Dewar is a Vice President and North Texas Infrastructure Division Manager at Freese and Nichols, Inc., a 700-person engineering, architecture, and planning firm headquartered in Fort Worth. As Division Manager, Mr. Dewar oversees transportation, stormwater, and urban planning and design groups in North Texas. With 27 years of experience, Mr. Dewar has led many high profile bridge projects, including the DFW Airport Skylink Automated People Mover, the Phyllis Tilley Memorial Pedestrian Bridge, the Clearfork Main Street Bridge, and the Trinity River Vision Panther Island Bridges. Mr. Dewar received his Bachelor of Science in Civil Engineering from the University of Texas at Austin, and a Master of Science in Engineering from the University of California, Berkeley.

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343155-1 - Clearfork Main Street Bridge – Two Bridges in One

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