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Thornton Tomasetti Proiect. LA888 N Main <br />Sublect: Oriainal Desian Code Comoarison <br />(UBC 1961) <br />Sheet No. <br />Job No. S18003.00 <br />Bv. JP 35 of 234 <br />Date. 6 Auaust 2018 <br />Justification for accpeting existing foundations as-is without exploration or <br />retrofit: compare demands from code-specified forces at time of construction to <br />those from damped 50%/50yr (72 year) event. <br />UBC 1961 - Section 2313d - Minimum Earthquake Forces for Buildings: <br />T:=1.7 <br />0.05 <br />C:=-= 0.042 <br />349 <br />K:= 1.33 Table No. 23-F - Buildings with a box system <br />1 Z:= 1 Zone No. 3 - Seismic Zone Map <br />W:= 21500· kip <br />VEQ:=Z·K·C·W= 1198 kip <br />H:=140·ft <br />/2 \ <br />OTA/I:=Vn?.1-·H=111810 kip·ft1 Base Shear from 50%/50yr (72yr M.R.I.) Time History Runs: <br />VTH_LRFi)=2000.kip <br />VTH _ASD=O·7.VTH_uu:D= 1400 kip <br />OTMTH_LHED-208450 ·kip·ft <br />OTA/ITH_ASD:-0.7 •OTAZTH_LHED= 145915 kip·ft <br />UBC and Damped 72yr Base Shears and Overtuming Moments are comparable. No foundation concern exists. <br />1 <br />1 <br />1