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HOLD- 420 W 17th St - Plan
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HOLD- 420 W 17th St - Plan
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Last modified
6/5/2025 7:37:20 AM
Creation date
6/5/2025 7:36:37 AM
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Plan
Permit Number
20482841
30447261
40339109
Full Address
420 W Seventeenth St
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2 <br />RTU ANCHORAGE [CRITICAL CASE]: <br />L =6.5 ft Sds =1.70 g z / h =1.0 <br />B =4.5 ft ap = 2.5 <br />H =3.0 ft Rp =6.0 <br />Wp =1.50 kip Ip =1.0 <br />SEISMIC COEFFICIENT: <br />Fp = 0.4 * ap * Sds * Wp / (Rp / Ip) * (1 + 2 * z/h) <br />Fp =0.4 *2.5 *1.7 / (6.0 /1.0 )*(1 +2 *1.0 ) * Wp <br />Fp =0.85 * Wp <br />Fp min = 0.3 * Sds * Ip * Wp =0.3 *1.7 *1.0 * Wp =0.51 * Wp <br />Fp max = 1.6 * Sds * Ip * Wp =1.6 *1.7 *1.0 * Wp =2.72 * Wp <br />Fp =0.85 * Wp <br />SLIDING CHECK: <br />P EL = Fp * Wp =0.85 *1.5 =1.28 kip <br />TRY:4-1/4" SDS SCREWS AT PLATFORM [V allow =0.25 kip, n =4 , CD =1.33 ] <br />P allow = CD * V allow * n =1.33 *0.25 *4 =1.33 kip >1.28 kip <br />USE <br />AT PLATFORM:4-1/4" SDS SCREWS AT PLATFORM <br />OVERTURNING CHECK: <br />M EL = P EL * H / 2 + 0.2 * Sds * Wp * B / 2 <br />M EL =1.28 *3.0 /2 +0.2 *1.70 *1.50 *4.50 /2 <br />M EL =3.06 ft-K <br />RM = Wp * B / 2 =1.50 *4.5 /2 =3.38 ft-K <br />T reqd = (0.7 / 0.6 * M EL - RM) / (B - 0.5) <br />T reqd = (0.7 /0.6 *3.06 -3.38 )/(4.5 -0.5 ) =0.05 kip <br />TRY:4-1/4" SDS SCREWS AT PLATFORM [T allow =0.60 kip, n =2 , CD =1.33 ] <br />T = CD * T allow * n =1.33 *0.6 *2 =1.6 kip >0.05 kip <br />USE <br />AT PLATFORM:4-1/4" SDS SCREWS AT PLATFORM <br />HOLD- 420 W 17th <br />St3/7/2025
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