What is the maximum deformation possible for a UBB?
The maximum deformation for a UBB is a function of the length of the brace which is subjected to yielding. The deformation limits are a function of both the maximum deformation and the cumulative plastic demand (number of cycles of yielding) to which the brace is subjected. Design ranges of plastic strain are about 1.5-2.0% for a DBE-type seismic demand, and 2.25-3.0% for a MCE-type demand. For brace geometries in buildings with typical floor-to-floor and column spacing dimensions, these strain ranges correspond to story drifts of about 1.5% for the DBE and 2.5-3.5% for the MCE condition.
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