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INSTRUCTORS:
Alemu M. Legese, Ph.D., M.ASCE
Ian Dickeson
Yavuz Mentes, PhD, PE
Rob Smith
Course Length: 1 hour
Purpose and Background
These presentations were recorded at Structures Congress 2026.
Coastal Bridge Responses to Extreme Flood Events Using CEL Simulations (13 minutes)
This presentation investigates the structural response of coastal bridges subjected to extreme flood and storm surge events using Coupled Eulerian-Lagrangian (CEL) simulation techniques in Abaqus. The research was motivated by increasing flood-related bridge damage and failures associated with hurricanes, storm surges, and coastal hazards. A validated fluid-structure interaction model was developed to simulate wave impacts on low-clearance coastal bridges under various submergence conditions. The study examines how vertical clearance influences hydrodynamic forces, uplift demands, and overall bridge vulnerability. Results indicate that the most critical condition occurs when storm surge levels reach the underside of the bridge superstructure, producing significant slamming forces and uplift effects. The presentation also discusses ongoing research focused on the effects of deterioration and corrosion on bridge performance during extreme flooding events.
Finite Element Analysis of Blast-Loaded Welded Mullion Connections (12 minutes)
This presentation evaluates the structural behavior of welded mullion-to-embed connections subjected to blast loads using detailed finite element modeling. The study addresses a common design assumption in blast-resistant glazing systems where mullions are often modeled as simply supported elements. Through nonlinear finite element simulations, the research examines the rotational stiffness and force transfer mechanisms associated with welded steel connections. Various embed plate anchor spacings were investigated to determine whether realistic pinned behavior could be achieved. Results showed that welded connections develop significant rotational restraint and induce moments that are not represented by simple support assumptions. The findings provide valuable insight into blast-resistant connection design and highlight the importance of accurately modeling connection behavior when evaluating structural demands.
CapEx Central Tunnels, Shafts, and Pump Station for a Resilient Metropolitan Austin (27 minutes)
This presentation describes the design of the Capital Express Central tunnel and pump station system developed to improve flood resilience for the reconstructed I-35 corridor in Austin, Texas. The project includes large-diameter tunnels, deep shafts, vortex drop structures, and a major underground pump station that collects and redirects stormwater to the Colorado River. Engineers faced significant design challenges related to deep excavation, groundwater pressures, complex geotechnical conditions, and construction constraints. Structural analysis focused on shaft design, pump station optimization, buoyancy resistance, and interaction with surrounding soils. Innovative design approaches allowed substantial reductions in wall thickness and construction costs while maintaining performance requirements. The presentation provides valuable lessons in multidisciplinary infrastructure design and urban flood protection systems.
Design and Construction of Fish-Carrying Aqueducts in Cold Climates (16 minutes)
This presentation discusses the design and construction of the Maple River and Cheyenne River aqueducts as part of the Fargo-Moorhead flood diversion project. The aqueducts serve as grade-separated river crossings, carrying natural waterways over a large flood diversion channel. Engineers were required to address a broad range of challenges including flood control, hydraulic performance, fish passage requirements, frost heave, and cold-weather operation. The aqueduct structures utilize reinforced concrete flumes, disconnected piled raft foundations, and specialized frost mitigation measures. Fish passage considerations influenced hydraulic design, flow velocities, habitat features, and operational requirements. The presentation demonstrates how structural, hydraulic, geotechnical, and environmental engineering were successfully integrated into a unique infrastructure project.
Benefits and Learning Outcomes
Upon completion of this course, you will be able to:
- Explain how CEL simulations can be used to evaluate hydrodynamic loads and structural responses of coastal bridges during extreme flooding events.
- Discuss the influence of welded connection stiffness on the blast response of steel mullion systems.
- Describe the structural design challenges and solutions associated with deep tunnel shafts and pump station infrastructure for urban flood resilience.
- Explain how structural, hydraulic, and environmental requirements are integrated into the design of fish-carrying aqueducts in cold climates.
Assessment of Learning Outcomes
Students' achievement of the learning outcomes will be assessed via a short post-test assessment (true-false, multiple choice, and/or fill in the blank questions).
Who Should Attend?
- Structural Engineers
- Forensic Engineers
- Bridge and Transportation Engineers
- Engineering Managers/Principals
- Building Design and Construction Professionals
- Researchers and Engineering Students
How to Earn your CEUs/PDHs and Receive Your Certificate of Completion
To receive your certificate of completion, you will need to complete a short on-line post-test and receive a passing score of 70% or higher within 365 days of the course purchase.
How do I convert CEUs to PDHs?
1.0 CEU = 10 PDHs [Example: 0.1 CEU = 1 PDH]