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Symbols
Cd = Deflection amplification factor in Table 12.2-1
δxe = Deflection at the location required by this section determined by an elastic analysis
Ie = Importance Factor
Δi = According to any column or wall earthquake, the relative displacement difference between two consecutive layers expressing reduced drift
δi = Story drifts
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Where the combined response for the modal base shear (Vt) is less than CsW, and where Cs is determined by Eq. (12.8-6), drifts are multiplied by CsW ∕ Vt.
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DRIFT AND DEFORMATION
Story Drift Limit
The drift, Δ, is calculated according to the procedures of Section 12.8.6. (Sections 12.9.2 and 16.1 give methods for calculating displacements for modal response spectrum and linear response history analysis procedures, respectively; the definition of Δ in Section 11.3 should be used).
The design story drift (Δ), as determined in Sections 12.8.6, 12.9.1, or 12.9.2, does not exceed the allowable story drift (Δa) obtained from Table 12.12-1 for any story.
Structure | Risk Category | ||
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I or II | III | IV | |
Structures, other than masonry shear wall structures, four stories or less above the base as defined in ASCE Section 11.2, with interior walls, partitions, ceilings, and exterior wall systems that have been designed to accommodate the story drifts | 0.025hsxc | 0.020hsx | 0.015hsx |
Masonry cantilever shear wall structures | 0.010hsx | 0.010hsx | 0.010hsx |
Other masonry shear wall structures | 0.007hsx | 0.007hsx | 0.007hsx |
All other structures | 0.020hsx | 0.015hsx | 0.010hsx |
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