topic Re: API CombinationType modification in Robot Structural Analysis Forum

API CombinationType modification

piglet0 — Fri, 14 Nov 2025 09:25:49 GMT

Hi All,

I preparing a script that modifies combination type for selected number of combinations. I have a problem with listing and changing combination type for sls frequent, characteristic etc.

I defined all types of available combinations:

I try to read combination type using following script:

Sub CombTypeList() Call CreateRobotObject Dim rSelection As RobotSelection Set rSelection = RobApp.Project.Structure.Selections.CreatePredefined(I_PS_CASE_COMBINATIONS) Debug.Print "Selection", rSelection.ToText Dim AllObjects As RobotCaseCollection Set AllObjects = RobApp.Project.Structure.Cases.GetMany(rSelection) Dim i As Long Dim c As IRobotCase For i = 1 To AllObjects.Count Set c = AllObjects.Get(i) Debug.Print c.combinationType Next i End Sub

In the result I got:

Selection 2to8 0 1 2 3 1 1 1

So SLS:CHR, SLS:FRE and SLS:QPR is simplified to SLS 1.

How can I get unique values of those types? API manual mentions for example I_CBT_SLS_EC_FRE = 4 but I have no idea how to read this value.

I would appreciate your help.

Michal

Re: API CombinationType modification

Stephane.kapetanovic — Fri, 14 Nov 2025 12:13:16 GMT

hi @piglet0

You can find the values of the enumeration IRobotCombinationType on page 429 of the "Robot API 20xx.pdf" available in the \SDK directory.

The CombinationType property is read/write.

Best Regards

Re: API CombinationType modification

piglet0 — Fri, 14 Nov 2025 12:53:14 GMT

@Stephane.kapetanovic thank you for your reply.

I found the table in the API manual, but for some reason I am not able to read those values.

Instead reading values of 4, 5, 6 I get 1 for all of them.

Can you take a look at the code in my post? I guess I do something wrong there. It could be a lame question because I am new to the use of API.

Thanks, Michal

Re: API CombinationType modification

Stephane.kapetanovic — Tue, 02 Dec 2025 08:33:13 GMT

Have you selected EN1990 Eurocode standards in the default preferences for design codes?

In any case, certain types of combinations are not accessed or edited in the standard way.

This project is currently underway. I’m preparing a post on combinations and will let you know as soon as it’s ready.

Best Regards

Re: API CombinationType modification

Stephane.kapetanovic — Fri, 28 Nov 2025 08:33:25 GMT

hi @piglet0

Here is a test project applied to generating combinations through direct insertion from the table.
The code addresses two major points:

execution time compared with using the API (three times faster),
and the ability to customize the parameters : Analysis Type, Combination Type, Case Nature, and SQRT.

In this version, the project ~~is limited to 75~~ is available for 9000 combinations and unlocked. It will be possible to link it with a table designed for creating combinations based on load cases sorted by number and by nature, similar to the ones that have already been freely shared on the forum.

The properties highlighted in green including combination type ↓ are writable.

For those who want to learn more about the code used and plan to include it in their own projects, you can refer to this page or read the vba code directly.

Best Regards

Updated 11/26/2025 - Rewrite / Modified protection / Packet size 75>500 / Total number of combinations 75>9000