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Response spectrum generator according to STN (Slovak standard)

Procedure to input a new STN seismic spectrum

1. Expand branch Libraries of the main tree menu.
2. Expand sub-branch Loads.
3. Start function Seismic spectrum to open the Seismic Spectrum Manager.
4. Click button New.
5. In combo box Input type select option STN - Slovak standard.
6. Review and, if required, adjust the spectrum parameters.
7. Click button Code parameter to review or modify the code-defined parameters of the spectrum.
8. Confirm the code parameters with OK.
9. Click OK to confirm the spectrum.
10. Close the Seismic Spectrum Manager.

Spectrum definition and code parameters

A response spectrum can be defined according to STN by selecting STN - Slovak standard as Input type.

Max frequency & Step

The values of the spectrum are generated between a maximum period of 4 seconds (=0.25 Hz) and the input maximum frequency, using the input Step value.

Code parameters

This button opens the dialogue defining the code-dependent parameters.

coeff accel. ag

Value of the design acceleration expressed as a multiple of the acceleration of gravity g

ag - design acceleration

Design ground acceleration on type A ground

eta damping coefficient

Damping correction coefficient (default = 1.0)

ksi - relative damping coefficient

Relative damping in % (default = 5%)

q - behaviour coefficient

Behaviour coefficient (default = 1.0)

Subsoil type

Ground type (A, B, C, D)

Theoretical background

Spectrum formulation TO DO

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