Long Span Bridges & Vibrations

Full Session with Abstracts

343155-3 - Margaret McDermott (MMD) Bridge - unique thrust-arch pedestrian bridge

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

Continuing the City of Dallas’ Balanced Vision Plan the Margaret McDermott Bridges serve as an amenity in the Trinity River park for pedestrians and cyclists alike. The MMD bridges provide a vital connection for the City’s ongoing expansion of their hike and bike trails. Seeking to compliment the iconic status of the recently completed Margaret Hunt Hill Bridge, the City again retained Santiago Calatrava for his renowned artistic, architectural and engineering talents.
Spanning the Trinity River natural channel, the twin pedestrian/cyclist bridges provide a signature component to TxDOT’s Horseshoe Project. The main span of the structure consists of a 1,125’ long thrust-arch that reaches approximately 325’ above the floodplain below. Each bridge carries a 20’-4” wide concrete deck that includes an 11’ bike path and 7’ pedestrian sidewalk. At its peak, the 8 sided steel arch section is 15’ wide and 6’-11” deep. Approaching each end of the structure the arch section expands and ultimately bifurcates into two legs that are fixed into a concrete substructure. Cables are hung from the arch at 10’-5” intervals to support the interior and exterior longitudinal girders. The interior longitudinal girder is supported on the adjacent IH-30 bridge bent caps at varying intervals, creating an asymmetric support condition.
The evolving conceptual design of the MMD bridges resulted in a unique structure, requiring in depth analysis, engineering experience and good judgement to compliment the design codes and guidelines prepared for more traditional bridges.
This presentation is targeted to a national audience of bridge design professionals

David J. Thompson

Structural Engineer

David J. Thompson, P.E. is a Structural Engineer for Huitt-Zollars, based out of their downtown Dallas office. He received a B.S. degree from Southern Methodist University and an M.S. degree from the University of Minnesota both in Civil Engineering. David has over 6 years of experience as a structural engineer focusing primarily on transportation projects. David’s project history includes; development of a bridge monitoring program, retaining wall design, conventional pre-stressed concrete bridge design, steel tub girder design, and bridge fatigue rehabilitation design. Locally, he has served clients such as; TxDOT and NTTA as well as Dallas County and surrounding cities. David was involved in the design of the Margaret McDermott (MMD) Pedestrian Bridge abutments and foundations. The MMD bridges are the second Santiago Calatrava bridges to span over the Trinity River.


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343155-3 - Margaret McDermott (MMD) Bridge - unique thrust-arch pedestrian bridge

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