SEAOI/NCSEA 17th Annual Bridge Symposium: Day 1

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Description

Keynote: Building Bridges: An Unlimited Potential

David J. Morrill, PE, SE

Education Session #1: Simon Kenton Bridge Temporary Suspender Retrofit
The Simon Kenton Bridge is a steel suspension bridge that was constructed in 1931 over the Ohio River. Michael Baker performed a routine, element-level, and fracture critical inspection on the bridge in July 2019. During the inspection critical findings were discovered on the fracture critical lower hanger cable connections near the stiffening truss. The critical find resulted from the severe deterioration and broken wires observed on multiple strands comprising the suspenders. At the worst location 2 of the seven bundles of the wire rope cable had section loss approaching 100%. After the critical find was reported to KYTC, Michael Baker performed a structural analysis to determine the safe load for the structure as well as the redundancy provided by the stiffening truss if a cable were to break. In addition, Michael Baker devised a concept to strengthen the deteriorated cables utilizing European references for this kind of repair. A Contract ready proposal (CRP) was developed to expedite these critical repairs.
Jason Stith, PhD, PE, SE

Exhibitor Presentation #1:
LARSA, presented by John Horner

Education Session #2: Design and Construction of the New Frederick Douglass Memorial Bridge, Washington, D.C.
This presentation will focus on the technical aspects of designing a signature arch bridge. The 540-feet long multiple arch spans have many challenges technically including: stability of parallel unbraced arches; geometric control of variable depth hexagonal arches 7 to 14 feet deep; thermal movement of 3 sequential arches; critical steel arch base connections into post-tensioned concrete v-piers; use of cable-stay technology to support the superstructure including accommodation of rotation translation; 1800-ton capacity steel pipe piles; complex substructure shapes and water line footings; and impact avoidance of critical utilities including a 108-inch diameter force main. The presentation will discuss the design approach and methodology as well as the role of the bridge architect versus the designer and contractor. Additionally, the erection of the structure will be discussed in light of loads and stresses imparted on the structure during construction. Wind tunnel testing; technical provision security requirements; scour analyses; and a 100-year corrosion protection plan will be highlighted.
Jixing He, PhD, PE, SE

Thank You from Our Sponsors
Michael Baker International, Inc.

The registration fee for the Bridge Symposium is $395 for members ($600 for nonmembers), which includes all 6.5 hours of recorded education.

Course will award 1.75 hours of continuing education
This course is Diamond Review approved in 49 states. New York does not accept hours from recordings

Please note: These webinars are not included in the NCSEA Webinar Subscription.

Contributors

David J. Morrill, PE, SE

David Morrill’s 36-year tenure at Alfred Benesch & Company encompasses leadership on countless structural and civil engineering assignments, in addition to his work fostering the talents of the Structural Group in Illinois. When David assumed the role of Structural Group Manager in 1995, the group consisted of less than 10 engineers. As he approached retirement, the group's size nearly tripled, utilizing the talents of 28 professionals ranging from junior staff to seasoned project managers.
Jason Stith, PhD, PE, SE

Jason Stith, PhD, PE, SE, obtained a Ph.D. in Structural Engineer from the University of Texas at Austin. He is a Bridge Technical Manager working for Michael Baker International in their Louisville, Kentucky office. To date he has made significant contributions to several major bridge projects touching every stage of a bridge’s life cycle (design, construction, inspection, and maintenance).
Jixing He, PhD, PE, SE

Jixing He, PhD, PE, SE, received his PhD in Structural Engineering from Illinois Institute of Technology in 1990. He is specialized in highway steel & concrete structures with over 30 years of experience in design, analysis and construction. He has designed several large, complicated, innovative and award-winning highway bridges. In recent years he has worked on four arch and cable-supported signature bridges in three states.
LARSA

LARSA is committed to providing the best structural engineering software and to accommodate each client's unique and changing engineering needs. In commercial use for over 25-years, LARSA's rock-solid analysis engine provides the latest in computing technology. LARSA's 4D BRIDGE SERIES software provides a unified 3D finite element environment for the analysis, design and rating of bridges without the need to purchase additional tools.

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