personnel between the Tebodin offices. Services offered by Tebodin EC Consultancy, site selection Conceptual studies Project management Permitting Basic and detail engineering Tendering and procurement Construction supervision and Commissioning. These are offered as single engineering or consultancy packages or on an EPC-Contract (Engineering, Procurement, Construction) or even turnkey basis. The services and know-how offered by Tebodin EC cover the following technological areas: Process Technology Power Plants Logistics Environment Automotive Telecommunications Steel and machine building Logistics and Manufacturing Buildings and Infrastructure: Construction, Architecture, Building physics, Installations, Transport, Estimating/Bid documents One of the main activities of Tebodin EC is to provide the full range of services for new facilities for foreign investors in Hungary, specifically in the areas of industrial plants, commercial and logistics centres and infrastructural development. Your Project: The project covers a very old blast furnace in a Hungarian steel work factory in the town of Dunaujvaros, (built in 1960). The statical system of this furnace was so that the base concrete block on soil supported the lower part of the furnace and the furnaces is also supported at 1/3 of the height with a spring on the surface mantle. A horizontal plate divided the two parts of the body. This plate functioned like a compensator, because the whole furnaces was heated of course and was supported in vertical direction on two different levels. The furnace was rebuild in 1989 when every element of the furnace was removed and rebuilt exactly as before. More space around the furnace was needed and they simply removed the supporting structures without reinforcements of the body. Now the horizontal plate in the middle served as support of the upper part, turning the furnace into a selfsupporting construction. It is interesting that the construction still stands with the changed statical system and the 40 mm thick middle plate. The steel work decided to remove the old furnace in 2001 and they build a new one. Satisfied with the old technology, the new furnace was built around the same kind of furnace. So they chose the same shape as before. Knowing that there were open questions about the earlier rebuilding, they commissioned Tebodin EC Ltd to do a stress analysis of the body of the furnace, to examine what point had to be reinforced for safe working over the next 10-15 years. We examined the whole furnace body and made a model from 2D members adding all the loads acting on the furnace. Technical data of the project Height: Base on Level +1.50 m, Top on Level+37.47 m Diameter: 11.576 m down, 10.43 in the middle, 4.28 m the throat Weight: 368 tons Material: Steel Fe510: (Ultimate strength: 510 Mpa/Yield strength: 355 Mpa) Thickness of the plates: Lower part 40 mm, Upper part 30 mm, Upper truncated cone 40 mm 4 connecting smoke ducts D=1891mm, t=25 mm on Level +36.0 m 16 pieces of oxygen blasting each D=990mm, thickness of the rim is 40 mm on Level +12.20 m. Loads: Dead load of the structure by ESA-Prima Win, loads in the inside of the body simulated by changing thickness of brick and other insulation materials Live load (long lasting/not long lasting): according to the technology Wind load: acc. to the Hungarian Standard, acting on the body and connecting structures direct Pressure inside: 1.5-2.5 bar Temperature load: temperature of the shell during work was measured by the plant & taken into consideration in two different load cases: Case 1: 12-60 °C, Case 2: 30-80 °C Load Combination according to the Hungarian Standards As a result of our analysis we could say that the stresses in the shell of the furnaces are nowhere bigger than the allowable limit. Some plate thickness had to be increased. The main problem was the above-mentioned horizontal plate; it was 40 mm before and had to be increased to 50 mm. The upper part of the body was made from 30 mm of plate before, but the part that connected to the horizontal plate was not strong enough, this part had to be reinforced too to 40 mm. Use of ESA-Prima Win Modules used Base module 3D shell Intersection Experiences with ESA-Prima Win As we wanted to make better and better model for this furnace we were keeping the point when we had to make intersections for different 3D members. We had not have the right module for it before, and we had to buy it, and the life was easy after that action. It was very comfortable to work with this module and I use it really very frequently for other projects too. I have other remarks too. At that time we could not apply the temperature load with the value of °C, but with relative displacement of the member. This question is not a question any more, because it has been changed. It would be useful if the local distributed load on a 3D member not only with one arrow would be marked but in the same form like the global loads. 39 SCIA User Contest Catalog
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