 Okay, hello. So it's a new case study. I was attending the training school this week here, so I came to an idea maybe not to work on examples that Sebastian told us and to program in MATLAB, but maybe to also contribute in such a way to present, you know, a material which was missing in all of the presentation. So I don't know who is here dealing with timber, but I will present one structure that we are assessing for some time. Okay, so first the main purpose of the initial investment in structural health monitoring is the extended service life of the building. I will show the building and I will not go through these slides with the textual slides and I will just talk on the slides where I have figures. So this is the technical museum Nicola Tesla in Zagreb and it was built exactly 70 years ago and it's timber trust system. It's one really not strange, but peculiar thing. It was designed to stand for one year. So it was just for a purpose of Zagreb Fair in 1947 and the snow load wasn't included in the original project of design of this building. And as we see it now, it's still standing 70 years after, 70 years after. Here are some sketches of this museum. So we have timber trust roof. We also have truss columns here. In this direction is 80 meters. The major span here is 25 meters and all together is 42, 43 meters. Basically it looks like this and it's just simple 3D model. It's really, it was, I don't know how to say, I was doing the assessment of this building and it's not really easy to assess it. You know, here the height of the building is one meter and you need to crawl between the trusses. And it was so, of course, in the winter is minus 10 here and during the summer it's 40 degrees inside. So we were doing this for several years. This was our flowchart how to assess the building. So we had some preliminary survey, some entity, some preliminary reports, visual inspection and so on and so on. And in the end we just pointed out the main faults, the main cracks, instabilities on the roof. And also in original projects, project there were no stabilizations. So we proposed some stabilization of the structure. So yesterday I was doing this. So maybe my presentation was not so developed because I started to do it yesterday. But I have something here. So the main, the owner is a city of Zagreb and the users are tourist students, citizens of the city of Zagreb. And what is really important is that this museum is under protection of cultural heritage in Timber. So when you assess this kind of building, it's not the same like you said, the buildings which are not the cultural heritage. So main objectives are, of course, extensive life. It's 70 years now, it was designed for one year. And to minimize operational maintenance inspection costs. Of course, optimized management system and to avoid some reputation loss. I said already this and we have some indicators and we have remedial actions. And as previous presentation, we have a problem with snow. Of course, what's happening? It was not designed to carry any snow. But in Zagreb, sometimes we have really heavy winters and we have a lot of snows. And what is actually happening now? People with the shells are throwing away the snow from the roof. So I just won't go back. But what happens then? They are throwing away snow from this truss and they are putting it here. And then again, down. So let's say it's a huge problem. And I think this case study can maybe improve all of these measures that we're doing in Zagreb in the museum. So remedial actions, do nothing, impose some kind of load restriction, or measurements how to restrict the load or to replace the structure. But it's not ideal to replace the structure because it's of heritage value. So it's thousands of problems. And yesterday we started to do Daniel Honfi and Dominic. They helped me. This was the first sketch of a decision tree. But in the end, we ended up in this. It was for the first time I was doing this. And maybe there are some mistakes. So we have a decision chance. And then we call it consequence in the end. So here is this is the biggest picture of this year, which is rectangle. So do nothing. We don't have failure. We have failure. And then we have some consequences, which can be a loss of life property loss of loss of revenue. Then we have assessment. So which kind of assessment? First we can have visual inspection, then maybe we can get satisfactory results. No failure, failure. Or no satisfactory results. And I don't know is this allowed, but to do it to go back here to first doubt. And then we still have a chance to choose to assess it with other methods or to have an intervention here. Of course, we will not go up and do nothing because we know that we have some kind of problem. I just want to explain this. It's the same. It's just to visualize the flow chart, the decision tree not to repeat all of this here and here because it was impossible to do it in a PowerPoint presentation. And then the last thing is an intervention. So we can have strengthening of structure, load reducing measures. It can be melting of snow or maybe such kind of similar measures and the demolition of the structure. And again, strengthening can be successful and not successful. And then we can have, if it's successful, no failure, but also maybe we can have some kind of failure. So this was really briefly, we were doing this yesterday. So I hope I introduce you to the problem of this and I still need to do fact sheets and everything. So thank you very much.