Response Spectrum EuroCode 8 Function Definition Form



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Access the Response Spectrum EuroCode 8 Function Definition forms as follows:

 

Click the Define menu > Functions > Response Spectrum command to display the Define Response Spectrum Functions form. Then do one of the following:

    • Select EuroCode8 Spectrum in the Choose Function Type to Add drop-down list and click the Add New Function button.

    • Highlight a previously defined EuroCode8 response spectrum function definition and click the Modify/Show Spectrum button.

See Response Spectrum Code Function Definition Form for details about using the form. The parameters for this code are as follows:

The 1998 Eurocode 8 response spectrum function is constructed as described in 1998 Eurocode ENV 1998-1-1:1994 Section 4.2.2. The parameters to be entered are the design ground acceleration, ag, the subsoil class and the damping correction factor, h. Any positive, nonzero value can be specified for the design ground acceleration. The damping correction factor must satisfy h ³ 0.7. The subsoil class can be input as A, B or C.

The ordinates of the response spectrum are calculated using Equations 4.1 through 4.4 in 1998 Eurocode ENV 1998-1-1:1994 Section 4.2.2. The values of bo, TB, TC, TD, k1, k2 and S are taken from Table 4.1 in 1998 Eurocode ENV 1998-1-1:1994 Section 4.2.2. Note that the value of these items depends on the specified subsoil class.

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