3/27/2019
ASCE 7-10 Auto Seismic Load Calculation This calculation presents the automatically generated lateral seismic loads for load pattern EQY according to ASCE 7-10, as calculated by ETABS. Direction and Eccentricity Direction = Multiple Eccentricity Ratio = 5% for all diaphragms Structural Period Period Calculation Method = User Specified
T ൌ 0.151 sec T ൌ3sec
User Period
Long-Period Transition Period, T L [ASCE 11.4.5]
Factors and Coefficients
Rൌ4 Ω ൌ2.5 Cୢ ൌ4 I ൌ1
Response Modification Factor, R [ASCE Table 12.2-1] System Overstrength Factor, Ω 0 [ASCE Table 12.2-1] Deflection Amplification Factor, C d [ASCE Table 12.2-1]
Importance Factor, I [ASCE Table 11.5-1]
Ss and S1 Source = User Specified Mapped MCE Spectral Response Acceleration, S s [ASCE 11.4.1] S ୱ ൌ1.14g Mapped MCE Spectral Response Acceleration, S 1 [ASCE 11.4.1] S ଵ ൌ0.468g Site Class [ASCE Table 20.3-1] = D - Stiff Soil Site Coefficient, F a [ASCE Table 11.4-1] F ୟ ൌ1.044 Site Coefficient, F v [ASCE Table 11.4-2] F ୴ ൌ1.532 Seismic Response MCE Spectral Response Acceleration, S MS [ASCE 11.4.3, Eq. 11.4-1] S ୗ ൌF ୟ S ୗ MCE Spectral Response Acceleration, S M1 [ASCE 11.4.3, Eq. 11.4-2]
S ୗ ൌ1.19016g S ଵ ൌ 0.716976g S ୈୗ ൌ0.79344g S ୈଵ ൌ 0.477984g
S ଵ ൌF ୴ S ଵ S ୈୗ ൌ 2 3 S ୗ S ୈଵ ൌ 2 3 S ଵ
Design Spectral Response Acceleration, S DS [ASCE 11.4.4, Eq. 11.4-3] Design Spectral Response Acceleration, S D1 [ASCE 11.4.4, Eq. 11.4-4]
Equivalent Lateral Forces Seismic Response Coefficient, C S [ASCE 12.8.1.1, Eq. 12.8-2] C ୗ ൌ S ୈୗ ሺୖ୍ ሻ
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