For Seismic design of vessels, CodeCalc uses the following tables of Coefficients. These coefficients are taken from the Uniform Building Code (1988).
|
Seismic Zone |
Cs |
|
0 |
0.0 |
|
1 |
0.069 |
|
2a |
0.138 |
|
2b |
0.184 |
|
3 |
0.275 |
|
4 |
0.367 |
The Cs factor from the chart will be multiplied by the operating weight of the vessel to produce a horizontal shear force which acts midway up the vessel.
If the above values are not satisfactory, enter your own value of Cs in the User Entered Seismic factor box. This value can be between 0.0 and 0.5. The following chart shows the various seismic zones.
