Seismic Load Generation page

Used to input seismic load data—either directly or by parameters which the program will then use to calculate code-specified seismic loads. The following codes are supported:

ASCE 7-2005 (US)
IS-1893 Part 1 (Indian)

Setting	Description
< Previous	Steps the Wizard to the previous step.
Next >	Proceeds the Wizard to the next step.
Cancel	Exits the Wizard without creating a new Heat Exchanger Footing job.

Setting	Description
Directly Input Seismic Loads	Depending on the load combination, operating seismic or empty seismic will be taken into consideration. Select this option to specify values for shear force and moment. Otherwise, seismic load generation parameters are required to generate loads.
Empty Load Case group	seismic load subjected at top of pedestal for empty conditions.
Operating Load Case group	seismic load subjected at top of pedestal for operating conditions.

Program Calculated - US Code

The program will calculate seismic loads per ASCE 7 for you. You have the option to use database mapped acceleration values based on Zip code or to specify values directly.

Select using Zip Code — Populates the Select Zip combo box with all U.S. zip codes. Choosing any one of them will (or simply type in the value to select faster) will selected mapped acceleration values for that geographic location.
Enter Value Manually— Specify values for S1 and Ss in the respective fields.

Setting	Description
City / Latitude / Longitude	(non editable) Displayed for the specified zip code to verify location.
S1 / Ss	The 1-second and short period acceleration values from ASCE 7 maps.
Site Class	Value of Fa and Fv, which are functions of Site Class and mapped acceleration values. Note: If Site Class is selected as F, Fa and Fv may be entered manually.
Response Modification Factor (R)	Select the response modification factor (either 2 or 3). Note: The value may be selected from the drop-down list a custom value may be entered manually.
Occupancy Importance Factor (I)	Select the importance factor for the structure (1.00, 1.25, or 1.50) Note: The value may be selected from the drop-down list a custom value may be entered manually.
Transverse Direction	Fundamental Period (T) in the direction transverse to the length of the horizontal heat exchanger vessel(s).
Longitudinal Direction	Fundamental Period (T) in the direction parallel to the length of the vessel(s).
Long-Period Transition Period (TL)	The Period for Long Transition defined in section 11.4.5.

Program Calculated - Indian Code

The program will calculate the seismic loads per IS-1893 Part 1 for you. You have the option to select a mapped acceleration value based on a Indian city or to specify values directly.

Note: Refer to US Code above for description of other common parameters.

Setting	Description
Seismic Zone Selection	Set the option to either Select City from a list of Indian cities or Enter Value Manually to select the Zone (Z) from a list.
Average Response Acceleration Coefficient	Set the option to either Select Soil Type from a list of soil descriptions or Enter Value Manually to type the Sa/g value directly.
Response Reduction Factor (R)	Select the reduction factor from the list as defined in Table 7 of IS 1893 Part 1.
Importance Factor (I)	Select the importance factor from the list as defined in Table 6 of IS 1893 Part 1.