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INSTRUCTORS: 
Chris Tollefson, PE
Jordan Perlmutter, PE
Andrew Ritter, PE
Julia McNamara, PE

Purpose and Background

This presentation was recorded at the ASCE Construction Institute Summit 2025.

Dunsmuir Deck Removal - Case Study of Concrete Arch Bridge Deck Replacement (44 minutes)

This presentation details the complex deck replacement of the Dunsmuir Viaduct, a post-tensioned concrete arch bridge in Vancouver, BC. The project posed significant logistical and structural challenges due to the bridge's unique design and urban location. Presenters discussed the strategic planning, engineering analysis, and innovative construction methods used to remove and replace the existing deck while preserving the structural integrity of the arches. Emphasis was placed on minimizing disruptions, ensuring public safety, and coordinating with various stakeholders. The case study highlights how advanced modeling and careful sequencing contributed to the successful execution of the work.

Gordie Howe International Bridge - Long Reach Tower Crane Ties (32 minutes)

This presentation focuses on the innovative use of long-reach tower crane ties in the construction of the Gordie Howe International Bridge, one of North America’s largest infrastructure projects. The project team explained how specially designed crane tie systems were developed to allow cranes to operate efficiently without interfering with the stay cables of the cable-stayed bridge. Topics covered included structural design considerations, dynamic behavior under wind loads, and safety protocols. The presentation also delved into installation logistics and the benefits of using modular tie assemblies for faster deployment. This case study showcases engineering ingenuity in overcoming spatial and structural challenges during tall tower construction.

Benefits and Learning Outcomes

Upon completion of this course, you will be able to:

• Describe the challenges associated with removing and replacing a bridge deck on a historic concrete arch bridge.
• Identify the specialized equipment and construction techniques used during the Dunsmuir Viaduct deck replacement.
• Explain how sequencing and planning were critical to minimizing impacts on structural integrity and surrounding infrastructure.
• List the factors influencing the selection and placement of long-reach tower cranes on a large infrastructure project.
• Discuss the structural design and function of crane tie-ins used in the Gordie Howe International Bridge project.

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?

• Construction Engineers
• Structural Engineers
• Project Managers
• General Contractors
• Early Career Professionals

How to Earn Your CEU/PDHs and Receive Your Certificate of Completion

This course is worth 0.2 CEUs/1.5 PDHs. 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 course purchase.

How do I convert CEUs to PDHs?

1.0 CEU = 10 PDHs [Example: 0.1 CEU = 1 PDH]