Last Update Tir AP1387, July AD2008 Copyright © 2005–2008 Caevandish All rights reserved. Defining Automatic Seismic Static Load Cases in ETABS and SAP2000 for Iran’s Code of Practices (AP1384‐AD2005 Edition) UBC 94 Seismic AutoLateral Load Parameters Prepared for ISEA ™ , by V. Sarmast, Dey AP1384, December AD2005 Use “User Coefficient” for “Auto Lateral Load” in “Define Static Load Case Names” dialog box. Use these parameters: • Base Shear Coefficient, ܥൌ ܫܤܣ (from Code) • Building Height Exp., ܭൌ1 Use UBC 94 for Auto Lateral Load in Define Static Load Case Names dialog box. Use these parameters: • Time Period: User Defined, ൌ (from Code) • Factors: Numerical Coefficient, ௪ ൌ ሺfrom Codeሻ • Seismic Coefficients: Seismic Zone Factor, , User Defined, ൌ ܣ(from Code) • Seismic Coefficients: Site Coefficient () and Importance Factor (ܫ): Use following table based on “Soil Type”, “Seismic Zone (ܣ)”, and “Importance Factor (ܫ)” from Code: Parameters from Code ETABS Parameters Soil Type Seismic Zone (ܣ) Time Period () (in seconds) I All Zones 0.10 0.40 2.0 0.9090 ൈ ܫ0.40 1.0 1.0858 ൈ ܫII All Zones 0.10 0.50 2.0 0.9090 ൈ ܫ0.50 1.2 1.0499 ൈ ܫIII All Zones 0.15 0.70 2.0 1.0000 ൈ ܫ0.70 1.5 1.1563 ൈ ܫIV 1 and 2 ( ܣൌ 0.35, 0.30) 0.15 0.8668 2.0 1.0000 ൈ ܫ0.8668 1.00 2.0 1.1000 ൈ ܫൈ మ య 1.00 2.0 1.1000 ൈ ܫ3 and 4 ( ܣൌ 0.25, 0.20) 0.15 0.8668 2.0 1.1818 ൈ ܫ0.8668 1.00 2.0 1.3000 ൈ ܫൈ మ య 1.00 2.0 1.3000 ൈ ܫNote: For 1.85, must control that 0.1ܫܣ. If it’s not satisfied, the multiplier value of ܫmay be increased. UBC 94 Factors for Approximate and Program Calculated Methods Prepared for ISEA ™ , by V. Sarmast, Tir AP1385, July AD2006 Structural System ܥ௧ (in metres) ܥ௧ (in feet) Empirical Method (Method A) * Program Calculated Method ** Not Increased 25% Increased Zone 4 Zone 1, 2, or 3 Steel Moment Resisting Frames 0.08 0.0328 0.0410 0.0316 0.0293 Concrete Moment Resisting Frames 0.07 0.0287 0.0359 0.0276 0.0256 Other Structural Systems 0.05 0.0205 0.0256 0.0197 0.0183 * ௦ௗ ൌ ** ௦ௗ ൌ min ሺ ௌ , ൈ ௧ ሻ Where ൌ ܥ௧ ൈ ܪ య ర and ௧ ൌ ൜ 1.3, 0.35 ሺZone 4ሻ 1.4, ൏ 0.30 ሺZone 1, 2, or 3ሻ
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Last Update Tir AP1387, July AD2008
Copyright © 2005–2008 Caevandish All rights reserved.
Defining Automatic Seismic Static Load Cases in ETABS and SAP2000 for Iran’s Code of Practices (AP1384‐AD2005 Edition)
UBC 94 Seismic AutoLateral Load Parameters Prepared for ISEA™, by V. Sarmast, Dey AP1384, December AD2005
Use “User Coefficient” for “Auto Lateral Load” in “Define Static Load Case Names” dialog box. Use these parameters:
• Base Shear Coefficient, (from Code)
• Building Height Exp., 1
Use UBC 94 for Auto Lateral Load in Define Static Load Case Names dialog box. Use these parameters:
• Time Period: User Defined, (from Code)
• Factors: Numerical Coefficient, from Code
• Seismic Coefficients: Seismic Zone Factor, , User Defined, (from Code)
• Seismic Coefficients: Site Coefficient ( ) and Importance Factor ( ): Use following table based on “Soil Type”, “Seismic Zone ( )”, and “Importance Factor ( )” from Code:
Parameters from Code ETABS Parameters Soil Type Seismic Zone ( ) Time Period ( ) (in seconds)
I All Zones 0.10 0.40 2.0 0.9090 0.40 1.0 1.0858
II All Zones 0.10 0.50 2.0 0.9090 0.50 1.2 1.0499
III All Zones 0.15 0.70 2.0 1.0000 0.70 1.5 1.1563
IV
1 and 2 ( 0.35, 0.30)
0.15 0.8668 2.0 1.0000 0.8668 1.00 2.0 1.1000 1.00 2.0 1.1000
3 and 4 ( 0.25, 0.20)
0.15 0.8668 2.0 1.1818 0.8668 1.00 2.0 1.3000 1.00 2.0 1.3000
Note: For 1.85, must control that 0.1 . If it’s not satisfied, the multiplier value of may be increased.
UBC 94 Factors for Approximate and Program Calculated Methods Prepared for ISEA™, by V. Sarmast, Tir AP1385, July AD2006
Structural System (in metres) (in feet) Empirical Method (Method A)* Program Calculated Method** Not Increased 25% Increased Zone 4 Zone 1, 2, or 3
Steel Moment Resisting Frames 0.08 0.0328 0.0410 0.0316 0.0293Concrete Moment Resisting Frames 0.07 0.0287 0.0359 0.0276 0.0256Other Structural Systems 0.05 0.0205 0.0256 0.0197 0.0183
*
** min ,
Where
and 1.3, 0.35 Zone 41.4, 0.30 Zone 1, 2, or 3
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