Load pattern FAQ

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How are line loads applied to membranes?

Answer: To apply line loads to deck-type objects, several options are available, including:

• Add these loads as distributed loads to decks, usually as small partition loads for decks without beams underneath.

• Add loads directly to supporting beams.

• Use shell-type objects.

For time-history analysis, can different ground motions be applied to individual supports?

Yes, please see the Displacement time-history record article for details.

Is it possible to apply multiple live-load patterns separately?

Extended Question: I am interested in applying various live-load patterns to determine the governing configuration. When I specify LIVE_LOC1 and LIVE_LOC2 as separate patterns, both of LIVE design type, the combination 1.2*DL+1.6*LIVE_LOC1+1.6*LIVE_LOC2 is automatically generated. How do I apply these patterns separately?

Answer: Load-pattern design types correlate with specific design post-processing methods such that design load combinations are automatically created with the appropriate load factors.

For the configuration described, the separate live-load patterns may be applied by manually creating load combinations as follows:

• 1.2*DL + 1.6*LIVE_LOC1

• 1.2*DL + 1.6*LIVE_LOC2