Crescent City Washington Tank Retrofit
Kelsey Structural provided the structural retrofit design of the existing 4.15 MG Washington Tank for the City of Crescent City, located in Crescent City, CA. The reservoir is located in an area of extreme seismicity which resulted in significant tank deficiencies including overstress of all courses of the shell, seismic instabilities, insufficient foundation sizing, lack of anchorage and insufficient adequate freeboard. Retrofit design of the existing AWWA D100 welded steel tank included a new concrete ringwall foundation with retrofit anchor bolts and chairs welded to the existing shell and shell overstress and freeboard recommendations to limit operating water heights in order to prevent shell damage and sloshing damage to the roof structure during a seismic event. Structural detailing of the concrete ringwall foundation, reinforcing and anchorage was also provided.
