The historic Atascadero City Administration Building was constructed between 1914 and 1918. The four-story domed structure (Rotunda Building) is of concrete post and beam with unreinforced brick infill wall construction. It was severely damaged during the 2003 San Simeon Earthquake. Damage included settlement of the foundation, cracking of brick walls, spalled concrete columns, and heaving of the basement floor. Earth Systems played an integral role in the design phase of the rehabilitation process for this significant structure.
The project won the Best Project in the Renovation/Restoration category in the Engineering News-Record (ENR) California’s Best Projects for 2014.
The scope included a series of geotechnical investigations and analyses that were closely scrutinized by FEMA. Earth Systems helped develop a plan to underpin the existing foundation using over 200 micropiles embedded into the underlying bedrock. A structural slab was then cast in the basement over the retrofitted foundation. The remaining structure was repaired using epoxy injection, shotcrete shearwalls, masonry anchors, and fiber reinforced polymer. Earth Systems’ scope of services during the design phase included analyses for liquefaction, seismicity, static settlement, and lateral earth pressures. Earth Systems also provided all of the materials testing and special inspection services for the City of Atascadero.