8/11/2019 Struct 1997 UBC Lateral2

http://slidepdf.com/reader/full/struct-1997-ubc-lateral2 1/2

(Version 3.1)

 (1997 Unifo rm Bu ildin g Code, Section 1630.2.1) 

Occupancy Category = Hazardous Facilities   ──► Seismic Importance Factor, I  = 1.25

(Table 16-K) Seismic Importance Factor, Ip  = 1.50

Wind Importance Factor, Iw  = 1.15

Seismic Zone = 2B   ──► Seismic Zone Factor, Z  = 0.2

(Table 16-I)

Soil Profile Type = SB   ──► (16-Q) Seismic Coefficient, Ca  = 0.20

(Table 16-J) (16-R) Seismic Coefficient, Cv  = 0.20

Calculated Ca = 0.66

Calculated Cv = 1.92

Basic Resisting System = Dual System Numerical Coefficient, Ct  = 0.020

Lateral Resisting Elements = Concrete Shear Walls System Coefficient, R  = 6.5

 Amplification Factor, Omega = 2.8

Building Height, hn  (ft) = 191 ft   ──► Building Period, T  = 1.03 Second(s)

Formula (30-4) = [ Cv I / R T ] W = 0.037 W

Formula (30-5) = [ 2.5 Ca I / R ] W = 0.096 W

Formula (30-6) = 0.11 Ca I W = 0.028 W

(30-4) need not exceed (30-5) and shall not be less than (30-6)  ──► TOTAL DESIGN BA SE SHEAR  = 0.037 W

Section 1612.3  ──► TOTAL DESIGN BA SE SHEAR  = 0.027 W

The following information are used for Seismic Zone 4 structures only!

Seismic Source DefinitionMaximum Moment Magnitude, M

M >= 7.0

M >= 7.0

M < 7.0

M >= 6.5

M < 6.5

Closest Distance to Known Seismic Source = 4 km

= 2.5 miles

Na = 1.30

Nv = 1.73

SEISMIC LOAD CALCULATIONS  8/16/2014

When the soil properties are not known in sufficient detail to determine the soil profile type,

Type SD shall be used

 ──►

( Eh )

( Eh / 1.

Seismic Source Type Seismic Source DescriptionSlip Rate

Faults that are capable of producing large magnitude events

and that have a high rate of seismic activitySR >= 5

 All faults other than Types A and C

SR < 5

SR > 2

SR < 2

Faults that are not capable of producing large magnitude

earthquakes and that have a relatively low rate of seismic

activity

SR <= 2

Developed by: Forum Engineers

Home

Copyright© 1994~2002 Forum Engineers. All rights reserved.

8/11/2019 Struct 1997 UBC Lateral2

http://slidepdf.com/reader/full/struct-1997-ubc-lateral2 2/2

(Version 3.1)

 (1997 Unifo rm Bu ildin g Code, Section 1630.2.1) 

Occupancy Category = Hazardous Facilities   ──► Seismic Importance Factor, I  = 1.25

(Table 16-K) Seismic Importance Factor, Ip  = 1.50

Wind Importance Factor, Iw  = 1.15

Seismic Zone = 2B   ──► Seismic Zone Factor, Z  = 0.2

(Table 16-I)

Soil Profile Type = SB   ──► (16-Q) Seismic Coefficient, Ca  = 0.20

(Table 16-J) (16-R) Seismic Coefficient, Cv  = 0.20

Calculated Ca = 0.66

Calculated Cv = 1.92

Basic Resisting System = Dual System Numerical Coefficient, Ct  = 0.020

Lateral Resisting Elements = Concrete Shear Walls System Coefficient, R  = 6.5

 Amplification Factor, Omega = 2.8

Building Height, hn  (ft) = 191 ft   ──► Building Period, T  = 1.03 Second(s)

Formula (30-4) = [ Cv I / R T ] W = 0.037 W

Formula (30-5) = [ 2.5 Ca I / R ] W = 0.096 W

Formula (30-6) = 0.11 Ca I W = 0.028 W

(30-4) need not exceed (30-5) and shall not be less than (30-6)  ──► TOTAL DESIGN BA SE SHEAR  = 0.037 W

Section 1612.3  ──► TOTAL DESIGN BA SE SHEAR  = 0.027 W

The following information are used for Seismic Zone 4 structures only!

Seismic Source DefinitionMaximum Moment Magnitude, M

M >= 7.0

M >= 7.0

M < 7.0

M >= 6.5

M < 6.5

Closest Distance to Known Seismic Source = 4 km

= 2.5 miles

Na = 1.30

Nv = 1.73

When the soil properties are not known in sufficient detail to determine the soil profile type,

Type SD shall be used

8/16/2014SEISMIC LOAD CALCULATIONS 

SR >= 5

SR < 5

SR > 2 All faults other than Types A and C

 ──►

( Eh )

( Eh / 1.

Seismic Source DescriptionSlip Rate

Faults that are capable of producing large magnitude events

and that have a high rate of seismic activity

SR < 2

SR <= 2

Seismic Source Type

Faults that are not capable of producing large magnitude

earthquakes and that have a relatively low rate of seismic

activity

Developed by: Forum Engineers

Home

Copyright© 1994~2002 Forum Engineers. All rights reserved.