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2024-02-15

Evaluating the Relevance of a Seismic Design

Click the Calculate All button in the 'Load Cases & Combinations' dialog box. The program then calculates all load cases and load combinations.

At the end of the calculation, the results of the result combination are determined automatically. Use the toolbar list to select the load case, combination, or design situation whose results you want to see.

Set the seismic design situation DS6.

The deformations of the platform girders are about 2.6 mm (though they are not relevant for the seismic analysis), while the maximum deformation of all surfaces is 1.1 mm. To display that value on the model, select the Values on Surfaces option in the upper part of the navigator (1). Then activate the Extreme Values in its lower part (2).

Select the "ordinary" ULS design situation DS1 next to compare the deformations.

The platform girders show deformations of 10 mm; the overall maximum of the surfaces is about 1.7 mm. Both values are significantly greater than those of the seismic design situation. It means that the model is not primarily prone to seismic actions. Rather, relatively small forces arise from the seismic analysis. This suggests the conclusion that earthquakes are not relevant for the design.