Wisconsin Department of Transportation retained Bloom Companies, LLC (Bloom) to design the USD 14.2 million reconstruction of the I-94/Rawson Avenue Interchange, requiring replacement of an existing four-span bridge with a new two-span bridge. Initially, the bridge had been designed as a conventional project but later shifted to an innovative accelerated bridge construction project to avoid long traffic detours and road closures. To accommodate the changing scope, complexity, and constraints of this specialized construction project Bloom relied on Bentley’s flexible and adaptable information modeling and bridge design and analysis software.
The shift to an accelerated bridge construction project required that Bloom adapt the original design files so the bridge could be built at offsite staging areas on either side of I-94 and then moved into final position using self-propelled modular transporters (SPMTs). Using Bentley software, Bloom easily adapted the original files to meet the unique requirements of the SPMTs. Bentley’s InRoads enabled Bloom to create more precise ground surface elevations to evaluate the bridge staging areas; and the flexibility and interoperability of MicroStation and LEAP Bridge Enterprise helped keep the project on schedule.
Bentley’s software products saved time and money. Bloom’s use of LEAP Bridge Enterprise to accommodate the implementation of SPMTs and precast bridge components helped to reduce the road closure of Rawson Avenue from six months to three weeks. There was little disruption to the local economy as traffic impacts were minimized. Bloom’s client realized enhanced construction quality and improved work zone safety since crews could safely construct the bridge out of traffic until ready to be transported.
The adaptability of LEAP Bridge Enterprise was instrumental in the structural design of the bridge: CONSPAN was used for supplemental pre-stressed concrete girder analysis, RC-Pier for analysis and design of the precast concrete pier elements, and GEOMATH for bridge geometry. LEAP CONSYS enabled Bloom to analyze special loading conditions for transporting the bridge spans via the SPMTs, limiting stresses and providing additional reinforcement, virtually eliminating deck cracking during transports. InRoads allowed for the fast development of the terrain models and contour mapping. Throughout the project Bloom used MicroStation for design, conceptual layout, and planning. The interoperability and flexibility of Bentley software enabled Bloom to accommodate complex changes quickly.