190 X3 Category 3: Industrial Buildings and Plants The existing building is currently used for storage activities. A development process demands changes which will allow the company to use the existing building for other purposes. After a redevelopment programme, the reconstructed building will be mostly used as a “Steel structures manufacturing plant”. Along one side of the reconstructed facility there will be a new canopy for storage and handling purposes. Architectural design The new design is based on the existing structure with a rectangular floor plan of 1,015 m2 and a double pitched roof with a parapet wall around the perimeter. Along one whole side of the facility there will be a new canopy of 788 m2, attached to the main columns of the structure with openings on the front and rear sides. Inside the main facility there will be a crane girder with a crane track along the length of the building. The girder is intended for an overhead travelling crane with a hoist that has a 10 t bearing capacity. The main goal of the design is to modify and strengthen the existing steel structure with minimal additional structural interventions in reconstruction. The crane and the crane girder will be relocated from their current location in another industrial building. Steel structure design and technical data Basic steel structure The main bearing structure consists of double pitched planar steel frames with a span of 20.0 m and a ~5.0 m eaves height. Frame columns are anchored into foundation buckets. The secondary structure consists of roof beams and stability beams with cross diagonal bracings. Both end frames have three facade columns which are also supporting roof columns and wall diagonal bracings. Modified steel structure The main structure frames are upgraded to a new eaves height of ~9.0 m with identical steel column sections. On the inner side of the frame, new column strengthening profiles are added parallel to the existing columns with a 0.5 m axial distance and height of 7.4 m. These columns have two functions. Firstly, they are to strengthen the existing structure, and secondly, they are to carry crane loads directly from the crane rail beams which are mounted on top of new columns. The stability of these columns is provided by angular bracing elements in the same fields as the main stability elements of the building and link beam elements to main columns. Both end frames were raised to a new eaves height and modified to assure the required bearing strength. The roof beams of the end frames were strengthened with a rectangular hollow steel section on the bottom side of the main section while facade columns were strengthened by adding a rectangular hollow steel section parallel to the main column with a 0.30 m axial distance provided by steel plates. Some additional stability beams were also added because of larger buckling lengths. In total, ~29,993t or 29.5 kg/m2 of additional steel was needed for the reconstruction of the main facility without consideration of the crane-rail beams. Crane rail track The installed crane rail track extends from the second axis and ends 1.2 m from the end of the building. The total length of the track is 43.8 m. No additional steel was added for the crane rail track. Canopy The canopy roof structure consists of main roof beams and columns on one side. The roof beams are coped at each end and strengthened with steel plates. Both end frames were designed to sit on two columns, because no additional loads were allowed on the corner columns of the main facility. Stability beams and diagonal bracings were used for global stability. The canopy structure weighs ~23,855 t or 30.3 kg/m2. Software and calculation model Scia Engineer 2012 was used for 3D-Modeling and calculation. The general idea was to achieve the complete use of the existing structure with minimal reconstruction costs, which was provided with optimisation of the structure for at least 16.4 kg/m2 or ~20% in comparison with a similar structure type and loads on other buildings calculated with other software. With the Scia software, all EC and National standards were also used. Software: Scia Engineer Reconstruction of Existing Industrial Building MOBITEX - Lendava, Slovenia
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