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Types 1-5 in the table above represent the existing building shear walls and <br />Types 6-10 represent the retrofitted shear wall capacity. <br />The m-factors come from ASCE 41-17 Table 12-3. All walls but type 5 are <br />plywood sheathed (wood structural panel sheathing or siding) with a height to <br />width ratio less than or equal to 3.5. Therefore the Life Safety and Immediate <br />Occupancy m-factors are 3.8 and 1.7 respectively. Type 5 is Gypsum wallboard <br />with a height-to-width ratio less than 1.0. Therefore the Life Safety and <br />Immediate Occupancy m-factors are 4.7 and 1.9 respectively. No shear walls <br />above the height-to-width ratios were credited as contributing to the SFRS. <br />As the shear wall on GL 1.5 is an unretrofitted, Type 3 wall, the calculations for the <br />shear wall capacity are shown below: <br />≔v s =⋅2 8 60 p l fplfplfplf 1 7 2 0 p l fplfplfplf Capacity per SDPWS 2015 Table 4.3A <br />The capacities of the 3/8" plywood walls were increased to 1/2" plywood <br />walls with the same nails and fastener spacing per footnote 2 of Table 4.3A. <br />Life safety capacity <br />＝v L S ⋅⋅⋅⋅ϕ m LS F y 0 .9 v s <br />≔ϕ 1.0 LRFD resistance factor, 1.0 per 41-17 12.2.2.5.1 <br />≔m LS 3.8 41-17 m-factors, per 41-17 Table 12-3 <br />≔F y 1.5 Expected strength factor, per 41-17 12.3.2.2.1 <br />0.9 Reduction factor for 2" studs per 41-17 12.4.3.6.2 <br />20 of 100 <br />1327 S Grand Ave <br />12/12/2024