Combination of loads

SOFiSTiK Teddy
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1

Hello there.
I have got some problems to define a combination of load cases which consist of:
1 - self weight (which is set by sofiplus)
2 - LM1 model load which is set by using Teddy.

What I have done for now is to set selfweight in sofiplus and I have created teddy files to run LM1 along the bridge on national lane A and national lane B.
I make also a combination of LM1 load cases to get a group of loadcases (I wanted to get a situation when LM1 on national lane A is taken into account in different position than LM1 on national lane B)

Now I want to write a code in Teddy to get a ULS combination of selfweight + leading load (LM1 - to be exactly group of load which I mentioned) + follow load for example wind load. All of those load should have correct coefficients and factors.

this is code of LM1 run on two national lanes (A = 10 and B = 11)
$case 1 - laneset 10
lc #lc_minu1 type GR_U titl ‘LM1:UDL Lane 10 A’
copy no #trai(0) fact 1.0 type gru ref ‘axis.10’ dx 0

$case 1 - laneset 11
lc #lc_minu2 type GR_U titl ‘LM1:UDL Lane 11 B’
copy no #trai(1) fact 1.0 type gru ref ‘axis.11’ dx 0

and hereunder is code which take the worst load case for lane 10 and lane 11:
comb 1 stan base 2100 type GR_T
lc (#lc_min1 #lc_max1 1) type A1
lc (#lc_min2 #lc_max2 1) type A2

What should I do now to write correct ULS combination rule with all factors and other stuff?

2

Hello,

as I have understood you want to make the ULS combination(s) for actions of bridges with the program MAXIMA.

At first the ULS combinations depend on the design code or its National Annex.
For the generation of the actions combinations for bridges you have two possibilities using load groups for the UDL and TS loads with former definition of these load groups in program SOFiLOAD or in the task Action Manager:

  • Using the program CSM Superpositioning
  • Manual creation of the action combinations with the program MAXIMA

For using CSM Superpositioning there are some videos are available in Youtube ‘SOFiSTiK | 2020 – Bridge Design Training → Bridge Design Training #04 – Actions and Load Types and Bridge Design Training #11 – Superpositions within CSM.

When you want to define the action combinations manually in the program MAXIMA there are more explanations about the combination of load groups in our Online Help which you can find in SSD or TEDDY via Help → Online Help → Tutorials → Superpositions → Superposition of Load Groups.

With kind regards
Sabine Fahrendholz
Senior Product Manager