AECT250-Lecture 37

AECT250-Lecture 37 - Lecture 37 Load-Bearing Walls The ACI...

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Lecture 37 - Page 1 of 7 Lecture 37 – Load-Bearing Walls The ACI recognizes the “ Empirical Design Method ” for the design of load- bearing concrete walls having the following limitations: 1. Wall must be solid, with a rectangular cross-section 2. Minimum wall thickness “t w ” = larger of 3. Applied load eccentricity “e” (including lateral load moments) < 6 w t 4. Wall must be adequately anchored at top and bottom 25 u L 4” Interior walls only 7½” Exterior walls Load-bearing Wall
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5. Must have horizontal & vertical reinforcement, with 2 rows of reinforcing for walls with t w > 10” #3, #4, #5 grade 60 bars #6 and bigger grade 60 bars Maximum bar spacing = smaller of 6. Effective length of wall for beam reaction = L eff L eff = smaller of 7. Design factored axial strength of wall = P n P n = 2 32 1 ' 55 . 0 w u g c t KL A f φ where: φ = 0.70 f’ c = specified concrete strength, PSI K = end fixity of walls = 1.0 for pinned-pinned = 0.70 for fixed-pinned A g = Gross effective area of wall section, in 2 = L eff x t w L u = unbraced height of wall, inches t w = thickness of wall, inches Center-to-center spacing of beams Width of bearing + 4t w Vert. bars A
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AECT250-Lecture 37 - Lecture 37 Load-Bearing Walls The ACI...

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