Architectural Offshore Production
Reviving a Relocated PEB Frame: From Site Mismatch to Fabrication-Ready Structure
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Sreela Biswas - August 7, 2026
- 12:11 pm
Sreela Biswas 
Task Assigned
Serving as Engineer-of-Record, uppteam was responsible for requalifying an existing pre-engineered metal building (PEB) frame, originally fabricated for a different site, against Rifle, Colorado’s governing snow, wind, and seismic loads.
Scope extended to cast-in-place foundation and anchorage design, a brand-new 10'-0" A.F.F. interior steel mezzanine, retrofit detailing for salvaged members, secondary framing modifications, and stud-wall-to-steel interface detailing. Every single component was required to be engineered to establish a continuous load path from the mezzanine and frame walls through the initial steel system to the foundation.
Project Timeline
- Phase 1 - The very first phase of the project spanned two weeks. During this period, we reviewed site-specific design criteria and PEB requalification for governing wind, snow, and seismic loads according to the 2021 IBC and ASCE 7-16. This also included a review of the original manufacturer's drawings.
- Phase 2 - Over the next two weeks, we worked on the foundation design. It involved footing and pier schedules, grade beams, slabs-on-grade, and base plate/anchor bolt details per the geotechnical report.
- Phase 3 - During this phase, we performed mezzanine framing and connection design, consisting of girders, joists, tube columns, bolted shear connections, and relocated stair framing using salvaged members.
- Phase 4 - In the final phase, our team focused on secondary framing modifications, supplemental strengthening, wind bent, roof framing detailing, elevations, and final document production.
Additional Notes
- The relocated frame encountered different governing loads than its original design intent. Accordingly, our engineers reassessed it against Rifle’s site-specific demands and specified targeted stiffener plates instead of wholesale member replacement.
- Introducing the mezzanine created load paths that the original frame was not detailed to receive, addressed via bolted shear connections and gusset plates engineered to transfer new thrust securely into the primary system.
- A relocated stair opening led to a diaphragm discontinuity, resolved by infilling with salvaged members and LVL, reutilizing prevailing steel wherever fabrication tolerances allowed.
- Two autonomous drawing sets risked conflicting field directions. Consequently, we set up an explicit document hierarchy within the general notes to avoid ambiguity before fabrication began.
