 Yeah, thank you very much Try to make it as quick as possible. Yeah, so this is a case study proposal from Sweden and the main person behind this is John Leander who is a Member of this cost action, but he couldn't come here working at KTH in Stockholm and we have another contributor Ivar Björnsson from the University and this is within a National project that we have in Sweden called the Big Brew. Brew means bridge so it's kind of a funny name for this and it's really inspired by this cost action So we really try to contribute in a way that we think could be practical because the main financier of this is the Swedish Road Administration So we try to look into What kind of methods they use and what are the problems that they have? We just had the reference group meeting two weeks ago So they are really excited about this to have a case study when it is cost action So this is the bridge. It's in a central Stockholm, Söderström bridge You might see it's really somewhere in the middle of Stockholm and It's a quite important bridge if There would be a traffic disruption that would that would be have quite significant consequences It's mostly commuter trains, but also Intercity trains and freight trains pass over the bridge more than 500 Trains every day. There's some data about the bridge. It's a steel bridge Six spans continuous Gerder bridge total length is about almost 200 meters and built in the 50s. So it's a quite old bridge and Yeah, as I said, it's it's quite important in both for the region and also for the country and It's a typical Steel railway bridge It has numerous Fatty critical details For example, I don't have a pointer here, but between the main beam and the crossbeams That's typical where they found cracks this web gap cracking the phenomena that occurred Quite a lot of similar cracks But we didn't select that case because those were repaired. We thought it's It's even more interesting to look at another detail, which is Like denoted with this Blue circle here in the middle Between the stringer beam and letter of basing Where there are no cracks, but theoretical assessments and also Strain measurements Indicate that there should be so according to the current regulation The the fatigue life has been exhausted. So then it's an interesting question. What should we do then? Is that okay, or do we have to do something with this? So that's that's sort of the inspiration of of this case study. This has been investigated quite a lot from But 2008 I think so there are a lot of publications and we have data on this So we try to put this in this condition assessment framework problem and That's a typical situation where after the visual inspection The the the manager the road and administration has to Make it a decision Should we further investigate The problem do a more detailed assessment or should we do some kind of intervention? So this this is what we are focusing right now with this we looked at There has been several research projects in Europe also from this cost action when this levels of assessments are Categorized in different ways. So we looked into this. I don't I don't want to talk about all the details because we have a little time then we thought that usually when they Move to a higher level of assessment that is could be categorized as three different things either Improving the the model of sophistication, that's how we called it like a structural modeling you can have a more detailed model or more advanced sexual model or The how you consider uncertainties like going to a high level of probabilistic assessment or it could relate to the information content in your assessment So this this is the inspiration of a way of thinking and then we illustrated this These different Directions in this group with this bridge so Looking at the modeling sophistication first you can do one can do an initial assessment conventional assessment with a Quite true simplified model and then can go to higher levels Then answer to the cost of consideration that could also be successfully or Subsequently increased and this is illustrated with this cube. This was just a guide guidance for us how this thinking is made and With all that that could that could be interesting to see how from the the origin of these axes you should Try to Try to get further and further in all directions typically So this is illustrated here with including more and more information That could be collected on the real structure And how this connects them to Or cost action here are just some numerical example from this case. So this has been analyzed with Reliability based methods And this you can see here that in this first initial assessment indicated that the fatigue life is Over so it's in sufficiently detail following the The guidelines for existing bridges in Sweden, but then of course or Quite often with more advanced methods you can prove that they're still Still remaining capacity or remaining service life and then what we thought what is difficult what is interesting then then The road administration has to decide on this if they should go on a for level That will have a cost either collecting information or just paying more for the consultant companies who have them with this But how these could be compared? So that that without could be a very good very simple example to focus on And and that is relatively easy So we started to do this with this posterior pre-prosterior analysis, but With just tentative numbers so like the cost of the inspection here is one unit and the The repair cost was set to hundred and the failure of the detail is is more expensive and But we talked to the road administration and they could provide us with realistic numbers So I think that would be quite interesting to see Yeah, I think that was it Some yeah, yeah, just some references. So the good thing is that it's Quite well documented and we have previous experience and models that we could use But you've said it or in connection to the expenses we have to pay for doing these another so You've shown that the value of information decision tree and contains experiments but Actually, I was talking about information requirement and actually using different system models or using different models is similar to an Experiment Yeah, yeah, and we have actually I forgot to mention that it's in the project we have more partners So we have two construction companies and consultant and also Chalmers from Gothenburg and Yeah, we would like to to come up with some realistic estimates of like even the engineers work For doing a more detailed assessment how much that we're costs and also the putting up sensors and and and we really have to be Persuasive because the the road ministrations really is typically very conservative So actually what they say that we don't need any Any monitoring system for new bridges we can talk about it after 30 years We are already What would have another