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Eriksson Culvert uses the internal forces from both analyses to develop unfactored EQ min/max envelopes for every member in the structure. The considered cases to develop these envelopes are:
Results from the racking analysis
Results from the vertical analysis
Racking + vertical analysis results
Users have the option of determining how ‘(3) Racking + vertical analysis results’ are calculated, by either of the following combinations:
1.
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0 / 1.0, which includes:
1.0 H + 1.0 V
-1.0 H - 1.0 V
-1.0 H + 1.0 V
1.0 H - 1.0 V
0.3 / 1.0, which includes:
0.3 H + 1.0 V
-0.3 H - 1.0 V
-0.3 H + 1.0 V
0.3 H - 1.0 V
1.0 H + 0.3 V
-1.0 H - 0.3 V
-1.0 H + 0.3 V
1.0 H - 0.3 V
These unfactored forces are then applied in the LRFD extreme event I load combination:
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