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Obtaining service loads from the analysis model in Sumo

When linear analysis is done, combinations are decomposed to unfactored load cases with their respective load factors. This cannot be done for non-linear analysis because superposition does not apply. Additional load combinations, with factors of one, are required.

Problem

The combined effect (C1) of vertical gravity load (D) and a lateral load (L) on a column is analysed.

After analysis, a pad footing is designed through the design link using the reaction forces at the support. Depending on the type of analysis, the loads table looks different.

Linear

Superposition applies and as such Sumo can decompose the combination into separate load cases with their respective load factors. This means the program can perform ultimate and service checks.

Non-linear (including second-order)

Superposition does not apply and as such Sumo cannot decompose the combination.

C1_PS1_1 represents ultimate loads.

Solution

If service loads are required, a second combination with factors of one should be created in Sumo.

After analysis, the loads table in the design program will look like this.

C1_PS1_1 represents ultimate loads.

C1_SLS_PS1_1 represents service loads.