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SEISMIC DESIGN BASE SHEARHow to Enter Data02/08/26
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(Sections 1615 to 1617 of The 2003 International Building Code & Section 9.5.5 of The ASCE 7-02)
Developed by Forum Engineers
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Occupancy Category=II. Other Structures─►Seismic Importance Factor, IE=1.00
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(Table 1604.5)Wind Importance Factor, IW=1.00
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Seismic Use Group=I
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Site Class=D─►Stiff soil profile=D
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(Table 1615.1.1)
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from ICC provided CD: SMS=143.8g%─►2/3 times SMS = SDS=0.959g
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(MCE Spectral Response Acceleration @ 0.2-second Period)
4Seismic Design Category per SDS=D
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from ICC provided CD: SM1=73.2g%─►2/3 times SM1 = SD1=0.488g
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(MCE Spectral Response Acceleration @ 1-second Period)
1Seismic Design Category per SD1=A
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Seismic Design Category per SDS & SD1
=D
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(Table 9.5.5.3.1) Coefficient, Cu=1.40
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Basic Resisting System=Bearing Wall System─►Response Modification Coefficient=6 1/2……..R
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Lateral Resisting Elements=Light frame walls with wood or steel sheathingSystem Overstrength Factor=3……..Ωo
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Deflection Amplification Factor=4……..Cd
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BmLih woNumerical Coefficient, Ct=0.02
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Numerical Coefficient, x=0.75
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Structure Height, hn (ft)=26
Approximate Fundamental Period, Ta
=0.23
Second(s)
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Structure Height Limit (ft)=65Period per Substantiated Analysis, T≤0.32
Second(s)
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Formula (9.5.5.2.1-1)=SDS / ( R / I ) W=0.147W
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Formula (9.5.5.2.1-2)=SD1 / T / ( R / I ) W=0.326W
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Formula (9.5.5.2.1-3)=0.044 SDS I W=0.042W
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(9.5.5.2.1-1) need not exceed (9.5.5.2.1-2) and shall not be less than (9.5.5.2.1-3)
─►TOTAL DESIGN BASE SHEAR=0.147W(Eh)
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Section 1605.3.2
─►TOTAL DESIGN BASE SHEAR=0.105W(Eh/1.4)
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