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Direction definition 

Click the Direction definition button in the dynamic analysisparameter dialog to define the direction of spectral/seismic excitation.

The Resolution of a force (seismic/spectral) into directions optiongenerates three seismic cases differing in direction of excitation. Theexcitation direction (X!") defined at the top of the dialog isappropriately resol#ed for the case (X$$) ($!$) ($$"). The names

of the ne%ly created cases contain information indicating %hichdirection the excitation is defined. Therefore #alues defined in the X !" fields are components of the excitation #ector. &elect 'se normalied#alues to scale component #alues so that the resultant #ector is a unit#ector.

or a seismic case calculated according to codes *& +, and -*& +$the parameter determining the spectrum direction is automatically set.

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Cases are generated as soon as the dialog for definingseismic/spectral analysis parameters is closed.

!ou can define the follo%ing combinations.

• uadratic

Note - combination may be a signed combination.

• according to *& +, code chapter .0

Group 1

Group 2

Group 3

 

• %here1• &x &y & 2 are the results of the automatically created cases for

directions X ! " calculated according to &R&& or C3Ccombinations respecti#ely. Combination type may be selected in theCombination selection field.

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