To specify an IBC 2012/ASCE 7-10 static seismic load

1. Either:

   Select Commands >  Loading >  Definitions >  Seismic Load >  IBC 2012 Load

   or

   Select the Definitions section in the Load & Definitions dialog and then click Add.

   The Create New Definitions / Load Cases / Load Items dialog opens with the Add New Seismic Definitions dialog tab selected.

   

   The Seismic Parameters as a stand-alone dialog

2. Select IBC 2012 ASCE 7-10 in the Type drop-down list.
3. (Optional) Select the Include Accidental Load checkbox to consider accidental torsion.

4. Either:

   Type a ZIP code

   or

   Type Latitude and Longitude values

   or

   Type Ss and S1 mapped values.

5. Specify the required seismic load parameters:

   1. Type long-period transition time, TL, value in the indicated units.
   2. Type an Importance factor (I) value.
   3. Type Response Modification Factor X (RX) and Response Modification Factor Z (RZ) values, respectively.
   4. Select the Site class (SCL) from the drop-down list.

6. (Optional) Specify the following optional seismic parameters as necessary:

   1. Type short-period site coefficient, Fa, and long-period site coefficient, Fv, values, respectively.

      Note: These values are required if Site class (SCL) of 6 is selected (corresponds to IBC 2012 site class of F).
   2. Type a CT value used to calculate the time period.
   3. Type the Period in X Direction (PX) and Period in Z Direction (PZ) values, respectively. Otherwise these values are calculated from the code.
   4. Type an exponent value, x, for use in ASCE 7-10 equation 12.8-7.

7. Click Add.

   The IBC 2012 parameters are added to the Seismic Definitions section of the Load & Definition dialog.

Refer to TR.31.2.15 IBC 2012 Seismic Load Definition for details.