 Ik denk dat deze nog is. Oké, dank je wel. Dames en dames, ik wil een kort presentatie geven over de bezoekers en de bezoekers die een aantal ongeving, monitoring initiaties ontdekken hebben in de Nederlands tijdens een study. De fact sheet was made together with a number of colleagues of mine from TNO also in collaboration with Mr. Driemann of Fubro Geoservices. The study of which I present the conclusions now was performed by the SBR CURNET from the Netherlands it's a Dutch association with partners from building industry that initiates research topics, stimulates innovations develops guidelines and disseminates knowledge and one of the studies performed by SBR CURNET was done by committee 1992 and the question to be answered was how can monitoring be applied and promoted in construction and maintenance. The committee consisted out of numerous parties from TNO but also Delft University governmental parties municipalities and building and consulting industry. So the idea was to take a number of ongoing monitoring projects and have a closer look at them answering questions like are they successful or not are their opportunities are their threats and if so why and can we then extract lessons from that. Now how did we evaluate these monitoring projects we decided to do that based on a scheme for monitoring I guess this is one of the many schemes that you can think of in case of monitoring and probably this one also has some flaws but it turned out to be very useful in structuring our study about the monitoring systems like the point to the top of the scheme where we see on the left an objective a goal that is searched for which should be balanced with the parties on the right hand side giving the supply of information of monitoring systems the flowchart that you see on the screen has a number of blocks and they also labeled with ABC and so on en these labelings will be used later on in presenting the state of the number of ongoing monitoring systems Normally one should start on the left hand side of the scheme in defining the objective so one might think of maintenance optimizations service life extensions gaining insight in specific mechanisms and owners or stakeholders are then interested in how these goals and objectives can be optimized and managed based on proper decisions and measures to be taken for instance optimized maintenance policies operational measures strengthening renewal but also was also introduced this morning this afternoon gathering information for learning so designed by experiments or introducing innovative projects or products coming to the right and once these objectives are looked for you also look for enabling and supporting models that describe the problems at hand and normally these models then also give incentives in proper quantities that can be measured if needed examples of these models quantities are models for threat close or threat close en if these give a need for extra information you can go on to the definition of the requirements of the monitoring so that will be a stage of phase C in our scheme going further towards the design and build of the monitoring system the operational phase with respect to acquisition and we are almost there but then of course it's also a matter of getting the information out of the data and giving the data and information towards the model to optimize then the decision phase stage G apart from the scheme just presented we also looked at some additional aspects that are important in classifying the state of monitoring systems and they are listed in this sheet on top there is the interests and needs of the owner or the user of the objectives that's also including the higher level societal and economic needs and interests then of course opportunities and threats what efficiencies and successes are found but also what kind of factors are found that are hindering a large scale application of structural health monitoring the time horizon is it temporarily or indefinitely in time a cost benefit of course quantitative with respect to for instance single cost or initial cost but also what would it be if one starts upscaling the systems data management is also found to be very important for instance is the organization ready to deal with these large in general large amounts of data is able to manage it and couple it to existing information and last but not least but also the technology readiness level, the real level of the systems to what extent the system is ready for repeated and also organization wide application so far for the scheme that we applied so it's about time to show some results it's probably readable in this matrix we see five projects that we're all dealing with maintenance optimization as an objective so some examples for instance a sense of system to measure the light intensity of a tunnel in Rotterdam with the goal to optimize the cleaning frequency this system came up to phase of stage C so it is not operational not found to be operational yet it's probably due to the fact that it has to be incorporated into the organization there are two examples of joints in highway viaducts again with the goal to optimize maintenance frequencies also these, now one of these two is still found to be in proof of principle and proof of concept stage and the second one is indeed already running and is successfully applied and there is a classical one chloride penetration in concrete we are in a feasibility study with respect to this so phase D some pictures has the picture of the master in Rotterdam with the light system or lighting system we were talking about oh this one I did mention I'm sorry about that but this is about tags or radio frequency IDs that enable the identification of structures but also components within structures and there and thus also decrease uncertainties that can take place for instance during inspections so it's more with respect to data management and a little bit out of context with monitoring maybe a second set of results is presented by this matrix we are now looking at a different objective in this case we are looking at service life extension examples shown here involve for instance on top the moving apartments of a bridge where there was a need of gaining the insight in the mechanisms taking place again a bridge joint whereas we of the people working on it successfully applied the monitoring system and as such could delay the maintenance by and also then successfully have the replacement be combined with other maintenance actions going on on the road there is a steel deck of the van Brienendord bridge in Rotterdam where the crack cross is monitored for those of you interested there is there was a paper also included in the booklet of the first workshop in Copenhagen about this and then again one for concrete silica reaction deterioration also in a highway and most of these projects presented in this matrix are running up and running successfully except for the first one where we did not yet or they did not yet found conclusive answers about the mechanisms looked for so this is a picture of the example with respect to the moving apartments this is the example of the crack cross modeling and monitoring in the van Brienendord bridge in Rotterdam a third set of projects that we looked at is presented in this last matrix it's about getting inside in behaviour of systems and structures first one is an interesting one where we are now introducing synthetic of fiber reinforced plastic lock gates in hydraulic structures in the Netherlands and one of the questions that is to be answered is how can load modeling be properly designed and applied from the regulations point of view again also let's say a kind of innovative path that is worked is with respect to high string concrete high strings concrete applied at the Styx bridge in Blaricum inside in the creep and shrinkage behaviour there are the autotropic steel elements in the helicopter bridge in Utrecht where we want to determine the additional load bearing capacity and there is a way motion system for several places in the highways in the Netherlands with the goal to evaluate the actual traffic loads we don't know they are still in compliance with the Eurocode all of these are basically all successfully up and running in the Netherlands a picture of a way motion system and also a picture of temperature data that is gathered for the synthetic lock gates in Blaricum so some conclusions about this study first of all the scheme or the flowchart it turned out to be a very useful guiding or guidance for appraisal it facilitated the monitoring system design balancing demand and supply it also facilitates the comparison of different monitoring systems getting feedback communication with respect to monitoring systems the monitoring systems themselves most of them turned out to be composed out of the shell components they are in general in general there are a lot of pilots in it by pioneers mostly research driven some of them are also business driven not yet always labeled as successful and what a big lesson learned is that if there are monitoring projects with clear objectives and a good interaction with supply they in general turn out to be more successful with respect to the application and upscaling I think this was also mentioned today that sometimes or maybe too often there we feel or find resistance from a practice a number of courses could be mentioned sometimes it's argued that problems are not urgent enough so in terms of let us proceed the way we always did sometimes the problems are too urgent so then they don't want to take any risk better safe than sorry why start monitoring if we just can place the element and finally the last two they always respect to the costs and benefits it's about who's going to pay and who's going to benefit that's also an important issue that plays a part in the application and upscaling and that's only respect to who and whom but also respect to time often you have to invest a lot of money now and be rewarded much later and maybe you are not the one who gets to reward so these conclusions I think they put some pressure on cost action of what the way that we all together are working on it should indeed enable better the applications of monitoring systems as we are all working on a more structured approach putting the objectives in front with a good balance on demand and supply and last but not least also respect to the costs I think earphones are always a good argument to get things done so the quantification of the value of information is very important for getting monitoring systems applied thank you very much ok thank you very much for sharing this experience from the Netherlands so as for the first part we'll have a short discussion I would like to steal 5 minutes of your time of the coffee break and I would like to invite the 3 speakers here to join me on the stage so in the second part we've even widened the scope of structures