ASCE 7-2002

[altoid3000]

I am using ASCE 7-2002 seismic code for design of a horizontal vessel. I am using DISASU software. Can someone tell me what the following parameters mean?
Sds, I, R

In the data book given to me, I need to use the following parameters. Ss=0.20, S1=0.08, I=1.25, Soil Type= +D. How do I translate these numbers into Sds, I, R that the software is asking for.

Please direct me to the correct section of ASCE 7-2002 to read. As you can guess I am a newbie.

 

[Shofa]

Ss and Sl are EarthQuake Parameters

These factors are for short and long periods (0.2 and 1.0). These tables are found on pgs. 100 - 117 (ASCE 98)publication.


R is Response Modification Factor

Enter the value from table 9.5.2.2 (ASCE) as required. R is usually equal to 2.5 for inverted pendulum systems and cantilevered column systems. For elevated tanks use a value of 4. For horizontal vessels, leg supported vessels and others use a value of 3.0.


I is Importance Factor

This is the occupancy importance factor as given in 9.1.4 (ASCE). The importance factor accounts for loss of life and property. This value typically ranges between 1.0 and 1.5.