125 In general „PARK ONE“ is an office building in the centre of Bratislava city. It consists of four underground and nine upper floors. The structure is designed as a monolithic reinforced concrete skeleton with slabs without ribs. The total height of the project above the ground level is 36 m. The excavation is surrounded on three sides by the main city infrastructure, which is separated from the excavation only by a pedestrian sidewalk. The depth of the excavation was 12 m. The nailed slope with additional ground anchors secured the walls of the excavation. The main raft was located about 2 m below the groundwater level, therefore the hole was stuffed by bentonite aperture to the impervious neogenic footwall and the water was drained. Geological conditions In the geological content of the building area is quarterar and neogene soil. The surface layer is created by anthropogenic sediments with the characteristics of dirt-sand accretions with the rest of the building process sewage. The sediment discharge is up to 1,50 – 2,0m p.t. Quarterar sediments are represented mostly by a sand-gravel complex. It is usually dirt-sand gravel with boulders up to 15 cm. Neogene is represented in a depth of 14m p.t. by relatively impervious negenic grey-green clay. Foundation The optimal solution due to the geological conditions was the shallow foundation – foundation raft in the gravel level. The raft is 1100 mm thick. The external walls of all of the basements are made of watertight concrete C30/37 with reinforcement fy=460 Mpa. Bearing system The main bearing system of the building is created from a cast in place reinforced concrete skeleton with reinforcement walls around the vertical communication cores. The walls thicknesses go from 300 mm to 200 mm. The object has 4 basement floors and 9 upper floors. The construction heights of the basement floors are 2,7 m and 3,9 m, the construction height of the ground floor is 4,8 m and the construction heights of the remaining floors are 3,55 m. The prevalent module step in the longitudinal direction is 7,5 and in the cross direction 7,5 and 5,1 m. The remaining bearing constructions are reinforced concrete columns and walls. The type of the concrete of the columns is C30/37. The horizontal bearing constructions are monolithic, reinforced concrete and slabs, designed from a C25/30 concrete in the whole extent. The thickness of the slabs is 230 mm. In order to secure the slab against the shearing efforts welded reinforcement are placed around the columns as a shearing reinforcement. The reinforcement of the slabs is created by the KARI mesh with additional reinforcement. The facade of the object is fully vitreous, therefore a belt girder is designed on the circumference of the roof rafts, so that the roof deformations were eliminated to a required standard. Structural calculations The calculations were realized by the SCIA•ESA PT 5.2 software, using the finite element method. The whole object was simulated in the 3D model created by 2D – shell elements, which are used for approximation of the bracing walls and for slabs. Columns are approximated by the 1D elements. The loads are calculated according to the valid Slovak standards. Module Soilin was used to simulate the footwall. Multifunctional Offices Building Park One Multifunctional Offices Building Park One „PARK ONE“ is an office building in the centre of Bratislava city. It consists of four underground and nine upper floors. The structure is designed as a monolithic reinforced concrete skeleton with slabs without ribs. The total height of the project above the ground level is 36 m. The excavation is surrounded on three sides by the main city infrastructure, which is separated from the excavation only by a pedestrian sidewalk. The depth of the excavation was 12 m. The nailed slope with additional ground anchors secured the walls of the excavation. The main raft was located about 2 m below the groundwater level. The facade of the object is fully vitreous, therefore a belt girder was designed on the circumference of the roof rafts.
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