My town was a seismic zone 2 under the old UBC code. Under the current IBC, what “seismic design category” is my town?
Because IBC takes into account numerous variables to determine the seismic design category (such as soil class, ground accelerations, use group of the building, and importance factor of the system), it is no longer feasible to label your town as a category “X”. Seismic design categories encountered in Montana are A, B, C, and D. Theoretically, it is possible to have two projects located across the street from each other, with different seismic design categories. With this in mind, there are typical categories that most (but not all) projects may fall under in a given town. Towns encountered with a seismic design category “C” are often Billings, Great Falls, and Hamilton. Towns encountered with a seismic design category “D” are often Kalispell, Missoula, Helena, Butte, and Bozeman.
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