A soft story building
To “Seismic Retrofit” a building means to add lateral stability to its structure by strengthening its walls (adding “shear value”) as well as transferring some of the load onto its foundations in order to prevent structural failure in the event of seismic movement or better known as an Earthquake.
Some wood frame buildings (constructed
If the open area of Soft Story structure has immediate walls next to it, those walls can be retrofitted by replacing the finishes of those walls (stucco or drywall) with sturdier plywood and anchoring them to the foundation. Adding shear walls — walls built for the sole purpose of adding lateral stability — can also be very effective, provided they don’t interfere with the structure’s function.
Steel moment frame
In the event of a Soft Story building where the openings are too wide or there aren’t any walls immediately attached to the opening, a steal moment frame reinforcement is required in order to meet the lateral stability required by the
In addition to strengthening the walls or installing a moment frame, continues foundations must be poured under the frame (or next to the shear wall) using a minimum 3000 PSI concrete with a large number of rebars to transfer some the load into the foundation.
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