August 30, 2019

Nested Load Combinations in RISAFoundation

RISAFoundation v12 now includes the ability to utilize “nested” load combinations. Currently, the Load Combinations spreadsheet in RISAFoundation is limited to eight columns of Basic Load Cases (BLCs) and Factor combinations. However, there are times where you may need to include additional entries to your Load Combination. To do this, you can simply “nest” your load combinations.

L Cspreadsheet basic 600x239 2x

This means that if you need more than eight BLC entries in a single load combination, you can define the common BLCs (such as Self Weight, DL, and/or LL) in one load combination that you can then reference in the other load combinations. Entering “Lnn” in the BLC field will include all the BLCs (and their factors) from the load combination on line “nn” of the spreadsheet, thereby “nesting” the combination. This can also be used to simplify your input.

FD Nested LC 600x102 2x

Note: When a Factor is assigned to the “nested” BLC line, it will be applied to all the entries in the nested combination. For example, in the image above, the DL in LC2 has a Factor of 1.2, whereas the “nested” combination (LC2) has a Factor of 1.5. This means that the two Factors will be multiplied together, resulting in an overall factor of 1.2*1.5 = 1.8 to the DL. This is why it is important to consider all factors listed when using the nesting feature.

Tags: RISAFoundation Loads Load Combinations

You may also be interested in

Nov 8, 2018 | Tips & Tricks
Mat Slab Overturning and Sliding Safety Factors

RISAFoundation v11.0 includes two new tabs in the Safety Factors resul...
Read More

Aug 21, 2019 | Tips & Tricks
RISA-3D v18 Sneak Peek Videos

The new release of RISA-3D is right around the corner! Check out our t...
Read More

Jul 12, 2019 | Tips & Tricks
Implementing Realistic Behavior for T/C Members in RISA-3D

Tension or Compression (T/C) Only members are commonly used in steel b...
Read More

Jun 20, 2019 | Tips & Tricks
Understanding Wall Panel Forces with Rigid Diaphragms

Rigid diaphragms represent a plane of very high rigidity and distribut...
Read More