![]() Integrating iTwin Design Review to the project allowed more than 180 reviewers across 15 agencies to easily access and comment on the model in a digital environment. The interoperability of Bentley's modeling software enabled NYSDOT to directly reference the highway designers' OpenRoads alignment file in the 3D bridge model, ensuring positional accuracy. Already familiar with Bentley applications, NYSDOT selected OpenBridge Modeler, ProSteel, and MicroStation to develop a 3D model of the entire bridge structure to a level of detail that contractually enabled the team to build directly from the model, without requiring the aid of a complete set of 2D plans. The scale and complexity of this bridge project made it an ideal choice for NYSDOT to utilize BIM and model-based contracting, working in an integrated technology environment to digitally exchange Bentley Applications Provides Digital Solution To achieve this digital context, they required integrated hybrid modeling technology to generate a dynamic 3D model of the complicated superstructure and pedestrian components. NYSDOT realized that they needed a more efficient approach and wanted to use a digital twin as the primary contract document and public outreach tool for contractors, stakeholders, and the community to virtually visualize the design intent and construction plan. Yet, for stakeholders and the community to understand the complex project staging, they would have to review hundreds of traditional plan sheets, which would have taken a significant amount of time. To optimize design and construction planning, NYSDOT needed to efficiently collaborate with utility owners, as well as with the public. Especially complicated was the structural design of an abutment to span a 58-foot-wide opening allowing for the future widening of an existing combined sewer line running parallel to East 138th Street directly underneath the bridge and below the Major Deegan Expressway. Of all the challenges that NYSDOT faced, some of the biggest were utility related. Aesthetically, the bridge also had to fit within the architectural landscape, connecting to the existing historic retaining walls. "There are many complex traffic, utility, geotechnical, and structural design challenges that needed to be overcome to ensure the success of this project," commented Brenda Crudele, director of structures design at NYSDOT. ![]() The team also had to handle a complex structural design to accommodate the wide variety of utilities surrounding the bridge, ramp restrictions being situated over a major urban expressway, and the unfortunate timing coinciding with the onset of the pandemic. However, given the location and criticality of the infrastructure to city transport, the interchange needed to remain fully functional throughout the bridge replacement, presenting challenges to the construction sequencing. Complex Structural Design, Construction Sequencing, and CollaborationĪt first glance as a single, short-span bridge, the project seemed uncomplicated. "Being located in a tight urban environment, while also having an incredibly high traffic and pedestrian demand, and being a key connection in the New York City marathon, proved a challenge to staging this project," said Zachary Maybury, design squad manager in the highway design department at NYSDOT. To eliminate these vertical clearance issues and accommodate heavy vehicle and pedestrian volumes, the New York State Department of Transportation (NYSDOT) initiated a USD 48 million project to replace the aging bridge structure, constructing a new 100-foot, single-span bridge in the busy urban area. Six lanes wide, with bike paths and sidewalks on both sides, the structure is wider than it is long, and has been struck numerous times due to the limited vertical clearance. It functions as a grade-separated diamond interchange that sees daily traffic volumes exceeding 150,000 vehicles and serves as a critical access point in the city's traffic grid. Replacing Critical Bridge Infrastructure in New York Cityīuilt in 1938, the East 138th Street Bridge is located in the Bronx and crosses over the Major Deegan Expressway, which is a mile south of Yankee Stadium. Bentley Applications Help Accurately Convey Planning and Resolve Costly On-site Construction Issues NYSDOT used Bentley applications to create a digital twin as the primary contract document that helped identify and resolve costly issues prior to construction. Bentley Incorporated : NYSDOT Industrializes East 138th Street Bridge Using Digital Twin
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