USACE Renew Hagen Dental Clinic, Building 5330

Our structural engineers designed the building addition and incorporated ATFP framing for replacement windows in the perimeter walls of the existing building. They also designed framing, structure repair, and reinforcement details for modifications and deficiencies of the existing building. The new addition was designed to meet current seismic loading guidelines.

In the absence of existing building structural drawings and with the soil stability issues, a structural investigation was performed. The building was seismically evaluated in accordance with ASCE/SEI 31-03 Tier 1 procedures, and a summary report documenting the results was produced. Based on the location of the facility within an area of moderate to high seismic activity, additional Tier 2 analysis work was undertaken. Finally, after the Tier 1 and Tier 2 analysis phases were complete, a seismic retrofit of the existing structure was undertaken in accordance with UFC 3-310-04 for any structural and nonstructural deficiencies present.

The structurally related ATFP measures included the evaluation and retrofit of the existing exterior masonry walls in accordance with stand-off requirements. In addition, the analysis and design of supporting structural elements for the new window and door glazing elements were performed.

The new addition was structurally isolated from the existing facility and built from reinforced CMU exterior bearing walls and cold formed metal roof trusses topped with a metal deck diaphragm. The floor of the addition was a slab-on-grade over a bed of engineered fill due to the required foundation depth. The foundations supporting the new addition extend to a depth matching the existing building foundations and are supported on site soils.