Non-linear support

SOFiSTiK
1

Hi all,

I am looking into modelling compression only supports on a bridge project. I went through the guidance documents but I cannot get my head around the non-linear analysis for the springs.
- How do I create an envelope of loads calculated with a non-linear support? It seems like all loads should belong to the same type - which would create a nightmare when building combinations.
- How do I run a traffic on non-linear supports?
- ASE tells me that I can only run one load at a time. it there a way to create a loop so that I do not have to call out each load case individually.

Note that I mainly use Teddy as an input and I feel like there has to be a more efficient way of modelling a bearing that what I am doing now.

Thank you!
Ines

2

Either you model everything linear and then the compression only is verified by checking for tension in the load combinations.

Or you have to manually combine the loads to a combined load and run a non linear analysis.

There is no superposition with non linear analysis by definition.
If there’s tension due to traffic, you don’t necessarily get lift in a bearing due to compression from self weight being greater.
So each load “combination” has to be combined manually for a non linear analysis, since you’re checking for lift due to a sum of actions.

3

Here is a way that i have been shown to make a loop for ASE to run nonlinear LC.

Defining the loadcase:


sto#ULS1_start 901 ! Number for first ULS dom. Temp LC
Let#LC_NO #ULS1_start

!*! ULS 6.10a STR-1
LC #LC_NO TYPE 'None' TITL 'ULS 6.10a - Dom. egenvægt' ! Type is None as MAXIMA needs loadcases to superposition
        COPY 100,110,410,420,440,450,        #KFI*1.2                     ! Dead load
        sto#LC_comb(#LC_no-#ULS1_start) #LC_no          ! Saves each LC numb. in LC_comb array to loop through in the ASE program
        Let#LC_NO #LC_NO+1                              ! go to next LC

sto#no_ULS1 #LC_no-#ULS1_start                             ! Saves the total number of ULS dom. Temp LCs

And in the ASE module:

+prog ASE urs:36.1
head ASE
CTRL SOLV 4 !solver option
CTRL WARN 129
CTRL WARN 125
CTRL WARN 120

let#LC #LC_Comb(:)

#DEFINE Run
    LC #LC(#i)
#ENDDEF

loop#i LC
    #include Run
    END
endloop


end