![]() Seismic Design Category F - Corresponds to buildings of Occupancy Groups IV ( Hospitals, Police Stations Emergency control centers etc)areas NEAR MAJOR ACTIVE FAULTS.Seismic Design Category E - Corresponds to buildings of Occupancy Groups I,II and III in areas NEAR MAJOR ACTIVE FAULTS.Seismic Design Category D -Corresponds to buildings and structures in areas expected to experience severe and destructive ground shaking But NOT located close to a major fault.Seismic Design Category C - Corresponds to buildings of Occupancy Groups IV ( Hospitals, Police Stations Emergency control centers etc) I where expected ground shaking will be MODERATE AND buildings of occupancy categories I, II, and III where MORE SEVERE ground shaking will occur.Stratified soils with Good and poor Soils Seismic Design Category B - Corresponds to buildings of Occupancy Groups I,II and III where expected ground shaking will be moderate.Seismic Design Category A – Corresponds to buildings in areas where expected ground shaking will be minor.The category assignment can range from A-F, and can be defined as the following: If A Seismic Design Category is a classification assigned to a structure based on it's occupancy category, and the severity of the design earthquake ground motion. Once you have figured out the SDC of your project, you can then determine your seismic requirements by using ISAT's online Seismic Requirement Calculator. ![]() If you are still having trouble determining what category it falls under, ISAT has staff available that can walk you through your project details and help you figure it out. If you are unsure of what Seismic Design Category (SDC) your project may fall under it can typically be found in the structural notes section of your construction drawings, or they may also be listed in the project specification. Whether you are trying to gain better understanding of how seismic requirements are determined, or just trying to complete what is required on a given project ISAT can help. We hear it from our customers everyday, trying to wrap your head around all the different aspects involved in determing what is required on any project can be tedious. Seismic Design Category Reference Information (ASCE 7-05 )
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