STAAD.Pro Physical Modeler Help

Create: Seismic Load Definition dialog

This dialog is used to add code-prescribed parameters for a static seismic load (i.e., an equivalent lateral force method) for use in applying those seismic loads to the structure.

Opens when the Add Seismic tool is selected on the Catalog ribbon tab in the Load Definitions group.

SettingDescription
Name Type a unique name to identify the seismic load definition.
Include Accidental Torsion Moment Check this option to include a multiplying factor for accidental torsion, used to multiply the seismic accidental torsion load. Type a value in the Factor(ACC) field. This value maybe negative (otherwise, the default sign for MY is used based on the direction of the generated lateral forces).
Include Natural Torsion Moment Check this option to include torsional moment due to accidental load, or the national torsion arising from the static eccentricity between the center of mass and center of rigidity. Type a value in the Factor(DEC) field. Use a positive value greater than 1.0 for the value. A value of 0.0 will ignore this option.
Code Select the country and building code from the drop-down list.
Version Select the code edition or type from the drop-down list.
Include Accidental Load Check this option to have the program calculate the accidental torsion. The value of the accidental torsion is based on the center of mass for each level of the structure.
Options (IBC/ASCE7 codes only) Select the option of providing mapped acceleration data. For ZIP code and Latitude/Longitude, the mapped acceleration data is populated based on USGS provided data.
  • Zip - Type the US ZIP code of the structure site below.
  • Latitude/Longitude - Type the latitude and longitude of the structure site below.
  • Ss/S1 - Type the mapped acceleration values directly below.
Properties Specify the code-specific parameter values or options as described in the following sections.
Table 1.
Country: Code Versions
Canada: NRC 2010

2005
China: GB50010 2001
Colombia: NRC 2010

1995
India: IS 1893 2016

2002/2005
Japan: AIJ 2006
Mexico: CFE 1993
US: IBC/ASCE 7 2018/2016

2015/2010

2012/2010
US: UBC 1997

Canadian: NBCC 2010

Parameters for seismic loading per the 2010 edition of the National Building Code (NRC/CNRC) of Canada.

SettingDescription
Sa(0.2) (SA1) Seismic Data, Sa(0.2), as per Table C-2.
Sa(0.5) (SA2) Seismic Data, Sa(0.5), as per Table C-2.
Sa(1.0) (SA3) Seismic Data, Sa(1.0), as per Table C-2.
Sa(2.0) (SA4) Seismic Data, Sa(2), as per Table C-2.
Importance factor (I) Earthquake Importance Factor, Ie, of the structure as determined from table 4.1.8.5 in the code. This dependent on the Importance Category and ULS/SLS.
Site class (SCL) an integer corresponding to site classes A through E (where 1 = A and 6 = F). Fa and Fv are determined based on Site Class as per Table 4.1.8.4.B and Table 4.1.8.4.C.
Fa Optional Short-Period site coefficient at 0.2s.
Note: Value must be provided if SCLASS set to F (i.e., f12 = 6).
Fv Optional Long-Period site coefficient at 1.0s.
Note: Value must be provided if SCLASS set to F (i.e., f12 = 6).
Higher Mode Factor, Mvx The higher mode factor along the X and Z direction. Refer to NRC Table 4.1.8.11.
Higher Mode Factor, Mvz The higher mode factor along the Z direction. Refer to NRC Table 4.1.8.11.
Force Modification Factor, (Rdx) The ductility-related force modification factor reflecting the capability of a structure to dissipate energy through inelastic behavior as described in article 4.1.8.9. along the X direction. Refer to NRC Table 4.1.8.9.
Force Modification Factor, (Rdz) The ductility-related force modification factor reflecting the capability of a structure to dissipate energy through inelastic behavior as described in article 4.1.8.9. along the Z direction. Refer to NRC Table 4.1.8.9.
Force Modification Factor, (Rox) the over strength-related force modification factor accounting for the dependable portion of reserve strength in a structure designed according to the provision of the Article 4.1.8.9. along the X direction. Refer to NRC Table 4.1.8.9.
Force Modification Factor, (Roz) the over strength-related force modification factor accounting for the dependable portion of reserve strength in a structure designed according to the provision of the Article 4.1.8.9. along the Z direction. Refer to NRC Table 4.1.8.9.
*CT Value in X direction (CTX) Optional CT value along the X direction to calculate time period.
*CT Value in Z direction (CTZ) Optional CT value along the Z direction to calculate time period.
*Period in X Direction (PX) Optional Periods of structure (in sec) in the X direction to be used as fundamental period of the structure. If not entered the value is calculated from the code.
*Period in Z Direction (PZ) Optional Periods of structure (in sec) in the Z direction to be used as fundamental period of the structure. If not entered the value is calculated from the code.
SFRS in X direction (STX) Type of lateral resisting system along the X direction. The parameters can take values from 1 to 5:
  • 1 = Moment Resisting Frames
  • 2 = Coupled Walls
  • 3 = Braced Frames
  • 4 = Walls, wall-frame systems
  • 5 = Other systems
SFRS in Z direction (STZ) Type of lateral resisting system along the Z direction. The parameters can take values from 1 to 5:
  • 1 = Moment Resisting Frames
  • 2 = Coupled Walls
  • 3 = Braced Frames
  • 4 = Walls, wall-frame systems
  • 5 = Other systems
Provisions for Command to check if the time period calculated is for the purpose of Member Strength or Deflection as per Clause 4.1.8.11.(3).(v)
  • 1 = Member strength
  • 2 = Deflection

Canadian: NBCC - 2005

Parameters for seismic loading per the 2005 edition of the National Building Code (NRC/CNRC) of Canada.

SettingDescription
Sa(0.2) (SA1) Seismic Data, Sa(0.2), as per Table C-2.
Sa(0.5) (SA2) Seismic Data, Sa(0.5), as per Table C-2.
Sa(1.0) (SA3) Seismic Data, Sa(1.0), as per Table C-2.
Sa(2.0) (SA4) Seismic Data, Sa(2), as per Table C-2.
Importance factor (IE) The earthquake importance factor of the structure. This input is based on Importance Category and ULS / SLS. Refer to NRC Table 4.1.8.11.
Site class (SCL) an integer corresponding to site classes A through E(where 1 = A and 6 = F). Fa and Fv are determined based on Site Class as per NRC Table 4.1.8.4.B and Table 4.1.8.4.C.
Fa Optional Short-Period site coefficient at 0.2s. Value must be provided if SCLASS set to F (i.e., f14 = 6).
Fv Optional Long-Period site coefficient at 1.0s. Value must be provided if SCLASS set to F (i.e., f14 = 6).
Higher Mode Factor, Mvx The higher mode factor along the X direction. Refer NRC Table 4.1.8.11.
Higher Mode Factor, Mvz The higher mode factor along the Z direction. Refer NRC Table 4.1.8.11.
Base Overturning Reduction Factor, Jx The numerical reduction coefficient for base overturning moment along the X direction. Refer to NRC Table 4.1.8.11.
Base Overturning Reduction Factor, Jz The numerical reduction coefficient for base overturning moment along the Z direction. Refer to NRC Table 4.1.8.11.
Force Modification Factor, (Rdx) The ductility-related force modification factor reflecting the capability of a structure to dissipate energy through inelastic behavior as described in article 4.1.8.9. along the X direction. Refer to NRC Table 4.1.8.9.
Force Modification Factor, (Rdz) The ductility-related force modification factor reflecting the capability of a structure to dissipate energy through inelastic behavior as described in article 4.1.8.9. along the Z direction. Refer to NRC Table 4.1.8.9.
Force Modification Factor, (Rox) The over strength-related force modification factor accounting for the dependable portion of reserve strength in a structure designed according to the provision of the Article 4.1.8.9. along the X direction. Refer to NRC Table 4.1.8.9.
Force Modification Factor, (Roz) The over strength-related force modification factor accounting for the dependable portion of reserve strength in a structure designed according to the provision of the Article 4.1.8.9. along the Z direction. Refer to NRC Table 4.1.8.9.
*CT Value (CT) Optional CT value used in calculating the period of the structure based on the empirical method.
*Period in X Direction (PX) Optional period of the structure (in sec) in the X direction, to be used as fundamental period of the structure. If not entered the value is calculated from the code.
*Period in Z Direction (PZ) Optional period of the structure (in sec) in the Z direction, to be used as fundamental period of the structure. If not entered the value is calculated from the code.

Chinese:GB50011-2001

SettingDescription
Fortification Intensity Zone the Fortification Intensity (ref. table 5.1.4-1). Acceptable values are 6, 7, 7A, 8, 8A, or 9. 7A represents 7 (0.15g), 8A represents 8 (0.30g).
Frequency of the Seismic Event
Seismic Design Group Design Seismic Group (ref. table 5.1.4-2). Acceptable values are 1,2, or 3.
Site Class Site-Class (ref. table 5.1.4-2). Acceptable values are 1, 2, 3, or 4.
Damping Ratio Damping ratio (default = 0.05 for 5% damping)
Additional seismic action factor at the top of the building δn , Additional seismic action factor at the top of the building (default as calculated from Table 5.2.1)
Shear Factor Shear Factor, λ, Minimum seismic shear factor of the floor (default as calculated from Table 5.2.5)
Maximum vertical seismic influence coefficient factor

and

*Period in the X direction optional time period along the X direction
*Period in the Z direction optional time period along the Z direction

Colombian: NSR-10

SettingDescription
Coeff. for peak horiz. design accel. (Aa) A coefficient representing effective peak horizontal acceleration for design (Table A.2.4-3 NSR-10). Must be within the range of 0 to 0.5 (inclusive) or the output will indicate an error.
Coeff. for peak horiz. design accel. (Av) A coefficient representing the effective peak horizontal velocity for design (Table A.2.4-4 NSR-10). Must be within the range of 0 to 0.5 (inclusive) or the output will indicate an error.
Short period accel. factor (Fa) The dimensionless amplification factor that affects the acceleration in the short periods due to the effects site (Table A.2.4-3 NSR-10). Must be within the range of 0 to 3.5 (inclusive) or the output will indicate an error.
Intermediate period accel. factor (Fv) The dimensionless amplification factor that affects the acceleration in the intermediate periods due to site effects (Table A.2.4-4 NSR-10). Must be within the range of 0 to 3.5 (inclusive) or the output will indicate an error.
Importance factor (I) The importance factor (Table A.2.5-1 NSR-10). Must be within the range of 1 to 1.5 (inclusive) or the output will indicate an error.
*Period calculation coefficient (Ct) Optional CT value to calculate time period. (Table A.4.2-1 NSR-10)
*Period in X Direction (PX) Optional Period of structure (in sec) in X-direction to be in lieu of fundamental period of the structure
*Period in Z Direction (PZ) Optional Period of structure (in sec) in Z-direction to be in lieu of fundamental period of the structure
*Exponent (Alpha) Exponent used in calculating the approximate period, Ta (Table A.4.2-1 NSR-10).

Colombian: NRC 95

SettingDescription
Zone Seismic Risk factor
Importance Factor (I) Soil Site Coefficient
Site coefficient (S) Coefficient of Importance

Indian: IS 1893 - 2016

SettingDescription
Zone Seismic zone factor. Refer to Table 3 (Clause 6.4.2) of IS:1893 (Part 1)-2016.
Response reduction factor (RF) Response reduction factor. Refer Table 9 (Clause 7.2.6) of IS: 1893 (Part 1) -2016.
Importance factor (I) Importance factor depending upon the functional use of the structures, characterized by hazardous consequences of its failure, post-earthquake functional needs, historical value, or economic importance. Refer Table 8 (Clause 7.2.3) of IS:1893 (Part 1)-2016.
Rock and soil site factor (SS) Rock or soil sites factor. Depending on type of soil, average response acceleration coefficient Sa/g is calculated corresponding to 5% damping. Refer to Table 4 (Clause 6.4.2.1) of IS:1893 (Part 1) -2016.
  • 1 = hard soil
  • 2 = medium soil
  • 3 = soft soil
Note: Use either SS orSA to specify site conditions. If both parameters are specified, SS is ignored.
Type of structure (ST) Structure type of the seismic-resisting system. The program will calculate natural period as per Clause 7.6.2 of IS:1893(Part 1)-2016.
  • 1 = RC moment-resisting frame building
  • 2 = RC-Steel composite moment-resisting frame building
  • 3 = Steel moment-resisting frame building
  • 4 = Building with RC structural walls*
  • 5 = All other buildings
Note: For ST 4 (concrete walls), you must also specify the shear wall area at the first story.
Damping ratio (DM) Damping ratio to obtain multiplying factor for calculating Sa/g for different damping. If no damping is specified 5% damping (default value 0.05) will be considered corresponding to which multiplying factor is 1.0. Refer to Clause 7.2.4 of IS:1893(Part 1)-2016.
Note: Use either DM orDF to specify damping. If both parameters are specified, DM is ignored.

This should be a value between 0 (zero) and 1.0, inclusive. For example, 7% damping should be specified as 0.07.

*Period in X Direction (PX) Optional period of structure (in sec) in X direction. If this is defined this value will be  used to calculate Sa/g for generation of seismic load along X direction.
*Period in Z Direction (PZ) Optional period of structure (in sec) in Z direction. If this is defined this value will be used to calculate Sa/g for generation of seismic load along Z direction.
*Depth of Foundation (DT) Depth of foundation below ground level. It should be defined in current units. If the depth of foundation is 30 m or more, the value of Ah is taken as half the value obtained. If the foundation is placed between the ground level and 30 m depth, this value is linearly interpolated between Ah and 0.5Ah. Refer to Clause 6.4.5 of IS:1893(Part 1)-2016.
Note: Use either DT or GL to specify foundation depth. If both parameters are specified, DT is ignored. See Node d below.
*Ground Level (GL) Y coordinate of ground level (or global Z coordinate for SET Z UP). A reduced lateral force is applied to levels below this height, per Clause 6.4.5.
Note: Use either DT or GL to specify foundation depth. If both parameters are specified, DT is ignored. See Node d below.
*Spectral Acceleration (SA) Average response spectral acceleration coefficient corresponding to site specific spectra. Refer to Clause 6.4.7 of IS:1893(Part 1)-2016.
*Multiplying Factor for SA (DF) Multiplying factor for calculating Sa/g.
*Height of building (HT) Height of the building. Refer Clause 7.6.2 (a) and Fig. 5 of IS 1893 2016
*Base dimension in X direction (DX) Base dimension of the building in X direction at the plinth level. Refer Clause 7.6.2(b) or (c)
*Base dimension in Z direction (DZ) Base dimension of the building in Z direction at the plinth level. Refer Clause 7.6.2(b) or (c)
Wall Area X Direction (For ST 4 only) Check to specify concrete wall area along the global X direction. The X Values field appears. Click in the field to display the table of Width and Length values for walls in the first floor.
Wall Area Z Direction (For ST 4 only) Check to specify cocnrete wall area along the global Z direction. The Z Values field appears. Click in the field to display the table of Width and Length values for walls in the first floor.

Indian: IS 1893 - 2002/2005

SettingDescription
Generate Opens the Seismic Parameter dialog, which is used to populate the parameter fields with appropriate values for the IS 1893 - 2002 code based on a more simplified set of general parameters.
Include IS 1893 Part 4 (IS 1893 - 2002/2005 only) Set this option to specify loads per IS 1893 (Part 4) 2005 for industrial or stack-like structures. When set, the a value for ST is required (1 or 5). When set and ST of 5 is used, CV and DV are also required.
If this check box is clear, then IS 1893 (Part 1) 2002 is used.

Notes: To use IS 1893 (Part 4) 2015, select that code separately.
Zone Seismic zone coefficient. Refer to Table 2 of IS:1893 (Part 1)-2002.
Response reduction Factor (RF) Response reduction factor. Refer Table 7 of IS: 1893 (Part 1) -2002 or Table 3 of IS: 1893 (Part 4) -2005.
Importance factor (I) Importance factor depending upon the functional use of the structures, characterized by hazardous consequences of its failure, post-earthquake functional needs, historical value, or economic importance. Refer Table 6 of IS: 1893(Part 1)-2002 or Table 2 of IS: 1893 (Part 4)-2005.
Rock and soil site factor (SS) Rock or soil sites factor. Depending on type of soil, average response acceleration coefficient Sa/g is calculated corresponding to 5% damping. Refer Clause 6.4.5 of IS: 1893 (Part 1) -2002 or Clause 8.3.2 of IS: 1893 (Part 4) -2005.
  • 1 = hard soil
  • 2 = medium soil
  • 3 = soft soil
Note: Use either SS orSA to specify site conditions. If both parameters are specified, SS is ignored.
Type of structure (ST)
For IS 1893 Part 1, the program will calculate natural period as per Clause 7.6 of IS:1893(Part 1)-2002.
  • 1 = RC frame building
  • 2 = Steel frame building
  • 3 = All other buildings
For IS1893 Part 4, the program will calculate period as per Clause 14.1 of IS:1893(Part 4)-2005 for stack-like structures. For Category 1 Industrial Structures base shear is calculated as twice the base shear of other structures as per Clause 8.3 of IS:1893(Part 4)-2005.
  • 1 = Category 1 industrial structure (Part 4)
  • 3 = All other industrial structures
  • 5 = stack-like structures
Note: This parameter is optional for Part 1, but is required for Part 4.
Damping ratio (DM) Damping ratio to obtain multiplying factor for calculating Sa/g for different damping. If no damping is specified 5% damping (default value 0.05) will be considered corresponding to which multiplying factor is 1.0. Refer Table 3 of IS:1893(Part 1)-2002.
Note: Use either DM orDF to specify damping. If both parameters are specified, DM is ignored.

This should be a value between 0 (zero) and 1.0, inclusive. For example, 7% damping should be specified as 0.07.
*Period in X Direction (PX) Optional period of structure (in sec) in X direction. If this is defined this value will be  used to calculate Sa/g for generation of seismic load along X direction.
*Period in Z Direction (PZ) Optional period of structure (in sec) in Z direction. If this is defined this value will be used to calculate Sa/g for generation of seismic load along Z direction.
Depth of Foundation (DT) Depth of foundation below ground level. It should be defined in current units. If the depth of foundation is 30 m or more, the value of Ah is taken as half the value obtained. If the foundation is placed between the ground level and 30 m depth, this value is linearly interpolated between Ah and 0.5Ah.
Note: Use either DT or GL to specify foundation depth. If both parameters are specified, DT is ignored.
*Ground level (GL) Y coordinate of ground level. A reduced lateral force is applied to levels below this height, per Clause 6.4.4.
*Spectral acceleration (SA) Average response spectral acceleration coefficient corresponding to site specific spectra.
*Multiplying factor for SA (DF) Multiplying factor for calculating Sa/g.
*Coefficient (CS) Coefficient as given in Table 6 of IS:1893(Part 4)-2005. Valid only for stack-like structures for calculating fundamental time period per Cl. 14.1.
*Area of cross-section (AX) Area of cross-section at the base of stack-like structures for calculating fundamental time period per Cl. 14.1 of IS:1893(Part 4)-2005.
*Modulus of elasticity (ES) Modulus of elasticity of material of stack-like structures for calculating fundamental time period per Cl. 14.1 of IS:1893(Part 4)-2005.
*Coefficient of shear force (CV) Coefficient of shear force given in Table 6 of IS:1893(Part 4)-2005. Required for stack-like structures (ST 5).
*Distribution factor (DV) Distribution factor for shear force given in Table 11 of IS:1893(Part 4)-2005. Required for stack-like structures (ST 5).

Japanese: AIJ

SettingDescription
Zone Zone factor (0.7, 0.8, 0.9 or 1.0 )
Normal coefficient of shear (CO) Normal coefficient of shear force ( 0.2 or 1.0 )
TC Value (TC) Period defined by ground support specification ( 0.4, 0.6 or 0.8 sec)
Ratio of Steel Part (ALPHA) Ratio of steel height to overall building height, which are used in the calculation of Rt.

Mexican: CFE - 1993

SettingDescription
Zone Zone number specified in number such as 1, 2, 3 or 4
Seismic Behavior factor X seismic behavior factor of the structure along X direction as a parameter according 3.2.4.
Seismic Behavior factor Z seismic behavior factor of the structure along Z direction as a parameter according 3.2.4.
Group of structure Group of structure entered as A or B
Soil Profile Type (STYP) Soil type entered as 1 or 2 or 3
*Site characteristic period (TS) site characteristic period
*Period in X Direction (PX) Optional Period of structure (in sec) in X-direction to be used as fundamental period of the structure instead of the value calculated by the program using Rayleigh-Quotient method
*Period in X Direction (PZ) Optional Period of structure (in sec) in Z direction (or Y if SET Z UP is used) to be used as fundamental period of the structure instead of the value calculated by the program using Rayleigh-Quotient method

IBC 2018 ASCE 7-15

SettingDescription
Zip Code The zip code of the site location to determine the latitude and longitude and consequently the Ss and S1 factors. (ASCE 7-16 Chapter 22). 
Latitude The latitude of the site used to determine the Ss and S1 factors. (ASCE 7-16 Chapter 22).
Longitude The longitude of the site used to determine the Ss and S1 factors. (ASCE 7-16 Chapter 22).
Ss The mapped MCE for 0.2s spectral response acceleration. (ASCE 7-16 Clause 11.4.2).
S1 The mapped MCE spectral response acceleration at a period of 1 second as determined in accordance with Section 11.4.2 ASCE7-16.
TL f9 Long-Period transition period in seconds. (ASCE 7-16 Clause 11.4.5 and Chapter 22). 
Importance factor (I) Occupancy importance factor. (IBC 2018 Clause 1604.5, ASCE 7-16 Table 11.5-1) 
Response Modification Factor X (RX) The response modification factor, R, for lateral load along the X direction, (ASCE Table 12.2.1). This is the value used for calculating Cs.
Response Modification Factor Z (RZ) The response modification factor, R, for lateral load along the Z direction, (ASCE Table 12.2.1) This is the value used for calculating Cs.
Site class (SCL) Site class. Enter 1 through 6 in place of A through F, see table below. (IBC 2018 clause 1613.3.2, ASCE 7-16 Section 20.3)
Fa Optional Short-Period site coefficient at 0.2s. Value must be provided if SCLASS set to F (i.e., 6). (IBC 2018 Clause 1613.3.3, ASCE 7-16 Section 11.4.3).
Fv Optional Long-Period site coefficient at 1.0s. Value must be provided if SCLASS set to F (i.e., 6). (IBC 2018 Clause 1613.3.3, ASCE 7-16 Section 11.4.3). 
*CT Value in X Direction (CTX) Optional CT value in X-direction to calculate time period. (ASCE 7-16 Table 12.8-2).
*CT Value in X Direction (CTZ) Optional CT value in Z-direction to calculate time period. (ASCE 7-16 Table 12.8-2).
*Period in X Direction (PX) Optional period of structure (in sec) in X-direction to be used as fundamental period of the structure. If not entered the value is calculated from the code. (ASCE 7-15 Table 12.8-2). 
*Period in Z Direction (PZ) Optional period of structure (in sec) in Z-direction to be used as fundamental period of the structure. If not entered the value is calculated from the code. (ASCE 7-16 Table 12.8-2). 
x index in X dir Optional exponent value, x, in X-direction, used in equation 12.8-7, ASCE 7. (ASCE 7-16 table 12.8-2).
x index in Z dir Optional exponent value, x, in Z-direction, used in equation 12.8-7, ASCE 7. (ASCE 7-16 table 12.8-2).

IBC 2015 ASCE 7-10

SettingDescription
Zip Code The zip code of the site location to determine the latitude and longitude and consequently the Ss and S1 factors. (ASCE 7-10 Chapter 22). 
Latitude The latitude and longitude, respectively, of the site used with the longitude to determine the Ss and S1 factors. (ASCE 7-10 Chapter 22).
Longitude The latitude and longitude, respectively, of the site used with the longitude to determine the Ss and S1 factors. (ASCE 7-10 Chapter 22).
Ss The mapped MCE for 0.2s spectral response acceleration. (IBC 2015 Clause 1613.5.1, ASCE 7-10 Clause 11.4.1).
S1 The mapped MCE spectral response acceleration at a period of 1 second as determined in accordance with Section 11.4.1 ASCE7-10.
TL f9 Long-Period transition period in seconds (ASCE 7-10 Clause 11.4.5 and Chapter 22).
Importance factor (I) Occupancy importance factor (IBC 2015 Clause 1604.5, ASCE 7-10 Table 11.5-1). 
Response Modification Factor X (RX) The response modification factor, R, for lateral load along the X direction, (ASCE 7-10 Table 12.2.1). This is the value used for calculating Cs.
Response Modification Factor Z (RZ) The response modification factor, R, for lateral load along the Z direction, (ASCE 7-10 Table 12.2.1) This is the value used for calculating Cs.
Site class (SCL) Site class. Enter 1 through 6 in place of A through F, see table below (IBC 2015 clause 1613.3.2, ASCE 7-10 Section 20.3) 
Fa Optional Short-Period site coefficient at 0.2s. Value must be provided if SCLASS set to F (i.e., 6). (IBC 2015 Clause 1613.3.3, ASCE 7-10 Section 11.4.3).
Fv Optional Long-Period site coefficient at 1.0s. Value must be provided if SCLASS set to F (i.e., 6). (IBC 2015 Clause 1613.3.3, ASCE 7-10 Section 11.4.3).
*CT Value in X Direction (CTX) Optional CT value in X-direction to calculate time period. (ASCE 7-10 Table 12.8-2).
*CT Value in X Direction (CTZ) Optional CT value in Z-direction to calculate time period. (ASCE 7-10 Table 12.8-2).
*Period in X Direction (PX) Optional period of structure (in sec) in X-direction to be used as fundamental period of the structure. If not entered the value is calculated from the code. (ASCE 7-10 Table 12.8-2). 
*Period in Z Direction (PZ) Optional period of structure (in sec) in Z-direction to be used as fundamental period of the structure. If not entered the value is calculated from the code. (ASCE 7-10 Table 12.8-2). 
x index in X dir Optional exponent value, x, in X-direction, used in equation 12.8-7, ASCE 7. (ASCE 7-10 table 12.8-2).
x index in Z dir Optional exponent value, x, in Z-direction, used in equation 12.8-7, ASCE 7. (ASCE 7-10 table 12.8-2).

IBC 2012 ASCE 7-10

SettingDescription
Zip Code The zip code of the site location to determine the latitude and longitude and consequently the Ss and S1 factors. (ASCE 7-10 Chapter 22). 
Latitude The latitude and longitude, respectively, of the site used with the longitude to determine the Ss and S1 factors. (ASCE 7-10 Chapter 22).
Longitude The latitude and longitude, respectively, of the site used with the longitude to determine the Ss and S1 factors. (ASCE 7-10 Chapter 22).
Ss The mapped MCE for 0.2s spectral response acceleration. (IBC 2012 Clause 1613.5.1, ASCE 7-10 Clause 11.4.1).
S1 The mapped MCE spectral response acceleration at a period of 1 second as determined in accordance with Section 11.4.1 ASCE7-10.
TL f9 Long-Period transition period in seconds (ASCE 7-10 Clause 11.4.5 and Chapter 22).
Importance factor (I) Occupancy importance factor (IBC 2012 Clause 1604.5, ASCE 7-10 Table 11.5-1). 
Response Modification Factor X (RX) The response modification factor, R, for lateral load along the X direction, (ASCE 7-10 Table 12.2.1). This is the value used for calculating Cs.
Response Modification Factor Z (RZ) The response modification factor, R, for lateral load along the Z direction, (ASCE 7-10 Table 12.2.1) This is the value used for calculating Cs.
Site class (SCL) Site class. Enter 1 through 6 in place of A through F, see table below (IBC 2012 clause 1613.3.2, ASCE 7-10 Section 20.3) 
Fa Optional Short-Period site coefficient at 0.2s. Value must be provided if SCLASS set to F (i.e., 6). (IBC 2012 Clause 1613.3.3, ASCE 7-10 Section 11.4.3).
Fv Optional Long-Period site coefficient at 1.0s. Value must be provided if SCLASS set to F (i.e., 6). (IBC 2012 Clause 1613.3.3, ASCE 7-10 Section 11.4.3).
*CT Value in X Direction (CTX) Optional Ct value in X-direction to calculate time period. (ASCE 7-10 Table 12.8-2).
*CT Value in X Direction (CTZ) Optional Ct value in Z-direction to calculate time period. (ASCE 7-10 Table 12.8-2).
*Period in X Direction (PX) Optional period of structure (in sec) in X-direction to be used as fundamental period of the structure. If not entered the value is calculated from the code. (ASCE 7-10 Table 12.8-2). 
*Period in Z Direction (PZ) Optional period of structure (in sec) in Z-direction to be used as fundamental period of the structure. If not entered the value is calculated from the code. (ASCE 7-10 Table 12.8-2). 
x index in X dir Optional exponent value, x, in X-direction, used in equation 12.8-7, ASCE 7. (ASCE 7-10 table 12.8-2).
x index in Z dir Optional exponent value, x, in Z-direction, used in equation 12.8-7, ASCE 7. (ASCE 7-10 table 12.8-2).

UBC 1997

SettingDescription
Zone Seismic zone coefficient. Instead of using an integer value like 1, 2, 3 or 4, use the fractional value like 0.075, 0.15, 0.2, 0.3, 0.4, etc.  
Importance factor (I) Importance factor
Rw in X Direction (RWX) Numerical coefficient R for lateral load in X direction
Rw in Z Direction (RWZ) Numerical coefficient R for lateral load in Z direction
Soil Profile Type (STYP) Soil Profile type. Valid range of values are integers 1 through 5. These are related to the values shown in Table 16-J of the UBC 1997 code in the following manner:
  1. SA
  2. SB
  3. SC
  4. SD
  5. SE
Note: The soil profile type SF is not supported.
Near source Factor Na (NA) Near source factor Na
Near source Factor (NV)( Near source factor Nv
*CT Value (CT) Optional CT value to calculate time period based on Method A
*Period in X Direction (PX) Optional Period of structure (in sec) in X-direction to be used in Method B
*Period in Z Direction (PZ) Optional Period of structure (in sec) in Z-direction to be used in Method B
IS: 1893 Seismic Parameters dialog
Parent topic: Catalog Ribbon Tab
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