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)
Seismic Load Generation calculation
- Directly Input Seismic Loads - specify values for shear force and moment
- Mass Table C.G. - (US code only) If mass data has been entered in the Time Period page for the calculation of the vessel's fundamental period, that data can also be used by the program to determine the center of gravity.
- User Defined C.G. - Specify the center of gravity of the vertical vessel.
Directly Input Seismic Loads
Depending on the load combination, operating seismic or empty seismic will be taken into consideration.
Setting | Description |
---|---|
Operating Seismic Load | seismic load subjected at top of pedestal for operating conditions. |
Empty Seismic Load | seismic load subjected at top of pedestal for empty conditions. |
Mass Table C.G. - US Code
The program will calculate seismic loads per ASCE 7-2005 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.
User Defined C.G. - 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.
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. |