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A worked limit states design of the precast, pretensioned and post-tensioned NU girders in a continuous four-span river bridge, from fabrication through end of service life.
This course walks through the complete girder design for an interior span of a four-span continuous river crossing built from NU (University of Nebraska) precast concrete I-girders. The girders are pretensioned in the plant, then made continuous over the piers with two stages of post-tensioning and a cast-in-place composite deck. Learners follow serviceability limit state (SLS) checks at each construction milestone: fabrication and transfer, first-stage post-tensioning, deck pour, second-stage post-tensioning, superimposed dead loads, and in-service conditions at the start and end of the design life. Each stage shows how load effects are established, combined and compared with prestressing steel and concrete stress limits, and how camber develops along the girder.
The course explains how the age-adjusted effective modulus (AAEM) method captures creep, shrinkage and strand relaxation, using transformed section properties, section strain and curvature at tenth points, and numerical integration with the trapezoidal rule to obtain slopes and deflected shapes. It then turns to ultimate limit states (ULS) under the Canadian Highway Bridge Design Code (CSA S6), covering load factors and combinations for construction and in-service cases, flexural resistance from strain compatibility at midspan and over the piers, and shear resistance including effective shear depth, minimum transverse reinforcement and the vertical component of prestress. Professional engineers in Canada gain a clear, stage-by-stage model for continuous prestressed girder bridge design.
What Will Be Covered:
Serviceability checks required at each construction and service stage
Load effects from self-weight, pretensioning and post-tensioning
Age-adjusted effective modulus (AAEM) method for time-dependent effects
Creep, shrinkage and strand relaxation in girder and deck concrete
Transformed section properties, strain and curvature at tenth points
Camber and deflected shape by numerical integration
Prestressing steel and concrete stress limit checks
Ultimate limit state load factors and load combinations
Flexural resistance by strain compatibility at midspan and piers
Shear resistance, stirrup spacing and vertical prestress component
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The Global Engineering Excellence Institute (GEEI) is a leading provider of Continuing Professional Development (CPD) courses designed to meet the evolving needs of engineers worldwide. Established in 2010, GEEI has a proven track record of delivering high-quality, industry-relevant training that empowers engineering professionals to stay at the forefront of technological advancements and best practices. Our comprehensive course offerings cover a wide range of disciplines, including civil, mechanical, electrical, and software engineering, ensuring that our learners receive the most up-to-date and practical knowledge. With a focus on practical application, GEEI's courses are developed by industry experts and are recognized by leading engineering bodies globally. We are committed to fostering a culture of continuous learning and professional growth, helping engineers achieve their career goals and contribute to the advancement of the engineering profession.