Seismic Calculator

The USGS Seismic Design Maps and Tools for Engineers is a great resource for quickly finding seismic design coefficients for different design codes.

Here we present maps, data, and tools for engineers interested in seismic design of buildings and bridges. Currently we have two separate tools for buildings in the U.S. and its Territories, for (generally speaking) present and imminent model building codes, respectively:

This is a valuable tool for structural engineers who have to calculate seismic loading.  You’ll want to add that one to your bookmarks.

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