RISA-2D modeling separate load cases under same load combination 1

[dgfem]

Hi, I am trying to figure out if RISA-2D is able to model separate load cases under same load combination.
On page 106 of RISA-2D Tutorial, it says: "Many structures, however, will be modeled with multiple separate load cases that are part of the same family."
SO I have a dead load of 10 kip, a live load 1 = 2kip, second live load = 3 kip. The load combination is 1.2 DL + 1.6 LL.
The solve give one solution to 1.2x(10) + 1.6 x (2 +3), which is not what I want.
I want it to solve for both cases:
Case 1: 1.2 x (DL = 10 kips) + 1.6 X(Live Load 1 = 2 kips)
Cas2 2: 1.2 x (DL = 10 kips) + 1.6 X(Live Load 2 = 3 kips).

I wonder if RISA-2D is able to model with multiple loads case under the same load combination family. Thanks.

 

[JoshPlumSE]

Yes. Take a look at your Basic Load Cases spreadsheet. It should look something like the following (from a demo version of RISA-3D v16). See how I have organized the BLC's so there are multiple ones assigned to the Load Categories LL and DL? When I used the load categories in the Load Combinations directly (as opposed to references the BLC number), That tells the program to grabe every BLC that has that category assigned to it and include it in the load combination with the corresponding factor.

 

[Lomarandil]

Note that Josh's example will include all of the loads listed as "DL" and "LL" in the load combination. Or in your example, 1.2x(10) + 1.6x(2+3).

In order to solve for different live load possibilities separately, you will need to build separate load combinations (as far as my RISA-fu knows).

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just call me Lo.