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ASCE 7-16 Seismic Base Shear <br />LIC# : KW-06019842, Build:20.24.08.01 Structural Engineering Consultants (c) ENERCALC INC 1983-2023 <br />DESCRIPTION:Seismic Base Shear Analysis <br />Project File: Design Check_2 Story.ec6 <br />Project Title: <br />Engineer: <br />Pro ect ID: <br />Project Descr: <br />" Cs " Response Coefficient ASCE 7-16 Section 12.8.1.1 <br />S : Short Period Design Spectral Response 1.056 <br />" R " : Response Modification Factor 6.50 <br />" I " : Seismic Importance Factor =1 <br />0.154From Eq. 12.8-2, Preliminary Cs = <br />0.395From Eq. 12.8-3 & 12.8-4 , Cs need not exce = <br />From Eq. 12.8-5 & 12.8-6, Cs not be less than =0.044 <br />DS <br />=Cs : Seismic Response Coefficient =0.1538User has selected ASCE 12.8.1.3 : Regular structure, <br />Less than 5 Stories and with T <<= 0.5 sec, SO Ss <= 1.5 for Cs calcul <br />= <br />= <br />Seismic Base Shear ASCE 7-16 Section 12.8.1 <br />W ( see Sum Wi below ) =50.05 kCs = 0.1538 from 12.8.1.1 <br />Seismic Base Shear V = Cs * W =7.70 k <br />Vertical Distribution of Seismic Forces ASCE 7-16 Section 12.8.3 <br />" k " : hx exponent based on Ta =1.00 <br />Table of building Weights by Floor Level... <br />Wi : Weight Hi : Height (Wi * Hi^k) Cvx Fx=Cvx * V Sum Story Shear Sum Story MomentLevel # <br />2 14.77 17.00 251.09 0.4708 3.63 3.63 0.00 <br />1 35.28 8.00 282.24 0.5292 4.07 7.70 32.63 <br />Sum Wi = 50.05 k Total Base Shear = 7.70 k <br />Base Moment = <br />533.33 k-ftSum Wi * Hi = <br />94.2 k-ft <br />Diaphragm Forces : Seismic Design Category "B" to "F"ASCE 7-16 12.10.1.1 <br />Level # Wi Fi Fpx : MaxFpx : CalcdSum Fi Sum Wi Fpx Dsgn. ForceFpx : Min <br />2 14.77 3.63 3.63 14.77 3.63 3.12 6.24 3.63 3.63 <br />1 35.28 4.07 7.70 50.05 5.43 7.45 14.90 7.45 7.45 <br />Wpx . . . . . . . . . . . . . . . . . . . . Weight at level of diaphragm and other structure elements attached to it. <br />Fi . . . . . . . . . . . . . . . . . . . . . . Design Lateral Force applied at the level. <br />Sum Fi . . . . . . . . . . . . . . . . . . Sum of "Lat. Force" of current level plus all levels above <br />0.20 * S * I * WpxMIN Req'd Force @ Level . . . DS <br />DSMAX Req'd Force @ Level . . 0.40 * S * I * Wpx <br />Fpx : Design Force @ Level . Wpx * SUM(x->n) Fi / SUM(x->n) wi, x = Current level, n = Top Level <br />EQ Shear (to design shear elements) <br />EQ (v1) = 3.63 * 1000 * 1.3 / (23 * 21) = 9.8 psf <br />EQ (v1) = 4.07 * 1000 * 1.3 / (23 * 35) = 6.6 psf <br />Pa e 33 of 39