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Seismic Modeling of an Irregular Water Treatment Structure

Seismic Modeling of an Irregular Water Treatment Structure

Lou Scatena
Published In: 
Engineering Structures Magazine,  
June 2013
This article summarizes the author’s experience in developing a structural model to analyze and design a structure for the Victor Valley (California) Wastewater Reclamation Authority that is approximately 50 feet wide by 300 feet long. Because the structure has significant horizontal and vertical irregularities, and is in a high seismic area of southern California, design codes specified three methods of analysis: (A) Modal Response Spectrum Analysis (MRSA) for structures with horizontal irregularities; (B) Tank Hydrodynamics for water basins; and (C) Equivalent Lateral Force (ELF) for regular structures. The three process-integrated areas are separated from each other by expansion joints and are shown in Figure 1, in which some roof and wall segments are removed to display internal components. Overall design of the facility was completed by the office of Carollo Engineers, Inc. in Phoenix, Arizona.
structural model
Scatena, L. "Seismic Modeling of an Irregular Water Treatment Structure." Engineering Structures Magazine, June 2013, pp: 23-25.