Photo: © 2020 Finley Engineering Group

Webinar Recording

Complex Steel Bridge Design Through SOFiSTiK and Parametric Modelling

The SR 826/Palmetto Expressway and SR 25/ Okeechobee Road Interchange Improvement Project in Miami-Dade County, FL consists of the design and construction of three new flyover ramps to provide additional routes with direct connection at the existing interchange while also improving safety and alleviating traffic. Each new ramp is composed of twin continuous steel box girders with spans ranging from 140’ to 230’ with a total bridge length of 7,241’. Four steel straddle bents are required in locations where the substructure cannot be founded beneath the girders due to obstructions from existing roadways or the Miami Canal. Each flyover ramp has unique geometric constraints including a varying deck width, curved girders with radii down to 330’, varying superelevations, and complex gore area framing that are modeled explicitly in 3D with a refined analysis in SOFiSTiK.


Webinar-Recording Outline:

 Introduction and Webinar Summary

• Okeechobee Interchange Project Overview

• Constructability in Design

        o   Box Girders vs Plate Girders
        o   Steel Erection Challenges
        o   Girder Erection Method “Air Splices” vs Temporary Towers

• Design Challenges and Solutions Through SOFiSTiK 

        o Ease of Complex Model Generation 

                -   Gore Area Framing
                -   Integral Straddle Bent

        o   Locating the Center of Stiffness and Thermal Movements
        o   Straddle Bent Thermal Gradient
        o   Live Load Implementation
        o   Integration of Forces
        o   Live Load Combinations
        o   Exporting Results into Excel

• Parametric Modeling with SOFiSTiK (Andrés v. Breymann)

• Modelling of a Steel Bridge with Rhino/Grasshopper (Andrés v. Breymann) 

• Additional Steel Design Methods with SOFISTIK (Andrés v. Breymann)

• Questions and Answers 

Your speakers:

Jerry Pfuntner, P.E., S.E.


Patrick Noble, P.E, S.E


Andrés von Breymann