Engineers' Society of Western Pennsylvania


337 Fourth Avenue
Pittsburgh, PA 15222

Phone: (412) 261-0710 Email: Get Directions

Monday, June 7, 2021

Special Sessions

Urban Cap Special Session

Time: 8:00 – 10:00 AM

IBC 21-SS01: Creating a Park over an Interstate: Design of Pittsburgh’s Urban Cap Project
Nick Burdette, P.E., HDR, Pittsburgh, PA; Roger Eaton, P.E., HDR, Pittsburgh, PA

Beneath this new park over I-579 is an adjacent box beam structure designed to fit in the extremely congested urban site and connect to existing adjacent bridges. This unique structure required project-specific load considerations and micropile foundations to avoid increasing loads on the existing interstate retaining walls, as well as slender piers constructed in narrow gore areas inches from existing foundations. Extensive redundant waterproofing systems were utilized to protect the structure from the park soil.

IBC 21-SS02: Creating a Park over an Interstate: History, Owner’s Perspective, and a Bridge to Renewal in the City of Pittsburgh
Zachary Workman, P.E., City of Pittsburgh, Pittsburgh, PA; Dan McDowell

Attendees will learn basics of the Preliminary Land Development Plan (PLDP) process as well as elements of a federal transportation grant application. They will also be introduced to owner concerns during construction and operation of municipal infrastructure, as well as how capital improvements fit into a city government’s long range plan.

IBC 21-SS03: Creating a Park over an Interstate: Park features, design, and community involvement
Dan McDowell, RLA, LaQuatra Bonci Associates, Pittsburgh, PA

The I-579 CAP Park is a unique project that grew out of a Master Plan for an old arena site. In the master plan, a park was suggested to span an interstate that severed the historic African-American neighborhood from its connectivity. An extensive public process was organized to program the park and select local artists. The park was to recognize the historic and cultural aspects of the historic Lower Hill neighborhood.

IBC 21-SS04: Creating a Park over an Interstate: Construction of a 3-acre Green Space in Downtown Pittsburgh
Kyle Smith, P.E., HDR, Pittsburgh, PA; Dan McDowell, LaQuatra Bonci Associates; Zachary Workman, City of Pittsburgh

The I-579 “Cap” Structure is a new urban park in Pittsburgh, Pennsylvania. The park surface will be constructed on top of a new structure that spans over the interstate highway below. The congested urban site presented many challenges including dozens of utilities, limited space to construct foundations, and delivery and erection of 126 unique adjacent box beams during brief interstate closures. Additional construction challenges for this project included the use of unique products and materials.

BIM Special Session

This session describes how state DOTs are moving to data-based workflows, including examples of how 3D models are being used for bridge design, construction, and asset management.

Session Chair: Ronnie Medlock
Time: 8:00 – 10:00 AM

IBC 21-SS05: Building Information Modeling (BIM) for Bridges and Structures
Ahmad Abu-Hawash, Iowa DOT

Building Information Modeling for bridges and structures is a national initiative for managing transportation assets. This presentation will discuss the ongoing efforts by state DOTs and AASHTO for the adoption of BIM as a life cycle management strategy. Also, the benefits of BIM in design, fabrication, construction, and asset management will be discussed.

IBC 21-SS06: PennDOT Central Office- PennDOT’s Planless 2025 program
Allen Melley, Pennsylvania DOT, Harrisburg, PA

IBC 21-SS07: NYSDOT 3 D Bridge Modeling Effort
Brenda Crudele, P.E., New York State DOT

IBC 21-SS08: After BIM: Use of Digital Twins in Bridge Projects
Alexander Mabrich, P.E., MSc, MBA, PMP, Bentley Systems, Fort Lauderdale, FL; JP Gauthier, Bentley Systems, Sunrise, FL; Burak Boyaci, P.E., Bentley Systems, Sunrise, FL

As Building information modeling (BIM), a technology being used in the bridge construction industry, owners are realizing than the information stored in the 3D model needs to interact with the various stakeholders of the project. A true BIM model for bridge structures improve design quality with a better representation of the design intent of the engineer rather than creating 2D drawings, constructability, and collaboration. However, a bridge project is not an isolated one. It includes multiple disciplines that need to collaborate in real time as their feedback could be crucial in the constructability of the bridge: utility conflicts, soil conditions, roadway geometry, overhead structures, traffic flows, environmental factors, social impact.
The purpose of this paper is to present the advantages of using Digital Twins to provide the missing element of human interaction with the BIM models. A Digital Twin, that starts with a 3D model, rich with information, and gets updated constantly depending on the phase of the project: design, construction and operation.

Railroad Special Session

Time: 8:00 – 10:00 AM

Construction Special Session

Time: 8:00 – 10:00 AM



W01: Los Angeles World Airports Automated People Mover – Elevated Guideway
Chester Werts, P.E., S.E., P.Eng., Greg Knutson, and Anthony Messmer, HDR

Time: 10:00 AM – 12:00 Noon

The $1.95B Automated People Mover (APM) is a 2.25-mile elevated guideway train system and the centerpiece of Los Angeles International Airport’s (LAX) Landside Access Modernization Program (LAMP). Project scope includes the design and construction of a guideway structure, five passenger stations, and a Maintenance and Storage Facility. An overview of the project, seismic analyses, hybrid CIP segmental box girders, and modeling/design techniques used to mitigate vehicle roll-over during seismic events will be discussed.