141 Technical data of the project This project treats the static of a reinforced concrete structure (C20/25) for a shopping-storing project in Bratislava – Slovakia. The structure was mounted from September 2006 up to January 2007. The total length of this structure is 88,5 m, the width approximately 11,4 m, the area 1000 m² and the volume more than 20.000 m³. The total volume of reinforced concrete for the structure amounted up to 512 m³ and its weight was 1413,6 t. The building costs are 750.000 Euro. Description of the structure The reinforced concrete structure of the shopping- storing project of the Wellington Company has 7 modules A-G, consisting of box girders type 4. The storing object has a breadth distance of 11,40m with expansion gaps of min. 30mm; the overall length of the object will be 88,50 m. The supporting structure of the object is made of reinforced concrete from spilt concrete consisting of vertical wall- and horizontal board elements forming a compact unit with transversal, as well as longitudinal stiffening in horizontal and vertical planes. On the supporting circumferential walls are fastened, on the outside, warming panels of a planar weight 30 kg/m², protecting the hall from meteorological and precipitation influences of weather and thermal bridge. The horizontal structures of the ceilings are formed of monolithic plates with a thickness of 200 mm with a span of max. 6,30 m. The mutual clear distance of two supporting walls – the circumferential one and the internal stairway is 8200 mm, but the plates will be placed on the longitudinal monolithic extenders, 200 mm broad, with clear spans 6,30 + 5,60 +3,60 m and the last one will be a variable one, from 6,10 to 0,00 m, because 7 object of stores are gradually getting shorter by a constant length 900 mm. The double- armed stairway is monolithic too. Monolithic circumferential walls and an internal stairway- holding wall stiffen the individual objects. On the front shield wall of the stores dominant is the main entrance with an oblique monolithic roof supported by a monolithic joist 1500 mm high for a clear span 8,20 m. Description oh the Parts of Concrete Structure The primary supporting system of the object is combined in the transversal, as well as in the longitudinal direction and it has been calculated for every loading effect. The object of the project in the static calculation is especially the monolithic structure supported by circumferential walls from three sides (on the fourth side – the front one – there is a glassed- in wall) and several supporting columns in axial distances max. 3,00 m and is considered as one special unit. On the first storey from the rear side, the ceiling plate is dimensioned as a bracket with the span 1,20 m, on which the dodged rear wall of second and third storey will be placed. The vertical supporting structures of the object, as well as the horizontal supporting structures of the ceilings will be consist of monolithic plates 200 mm thick from concrete C20/25, which according to the static calculation are mutually sticked. The vertical communication areas – stairways – are situated in the stairway area limited by the internal supporting monolithic walls 200 mm thick. Both arms of the stairway are formed by bent monolithic plates sticked into pedestal and interpodestal supporting monolithic plates by anchoring stiffeners. The effective thickness of the plate is 150 mm.The main pedestal plates are, on the other hand, inserted into the internal supporting wall and into the circumferential walls 200 mm thick, which are limiting the stairway area approximately 5,30 x 2,60 m. All stiffening elements of the object are monolithic structures of the supporting system, i.e. they are designed in the longitudinal, as well as transversal direction and in the ceiling plane monolithic wall elements and on the fourth storey also supporting columns. Foundations The ground of the object of the stores area – setting the lower parts of the walls will form a reinforced concrete foundation made of concrete of the class C16/20 as far downward as the non- freezing depth. Dimensions of the reinforced concrete foundation strip are transversally 600 x 600 mm approximately to the depth -3,275 m. The fundaments for the circumference of the object and for the internal supporting walls around the stairway will follow form monolithic fundament strips under the supporting walls of the object. Material and loading data Foundation and bearing structures were designed acc. to ENV 1993-1-1:1992 Euro code 3. Design of the device consists of calculation and evaluation of a number of load cases and their complex combination effect: Except the dead load (own weight) was considered live load – for ceilings it is the standardized value 2,50 kN/m², for stairway 3,00 kN/m². Snow loading (area II.) so = 0,70 kN/m2 and wind loading wo = 0,55 kN/m² (during erection and on final building). After that was considered seismicity 7o MSK-64, category “A” and temperature loading (shell structure contains a higher temperatures as column support during operation). Description of the method of Static calculation Static calculation is prepared with software NEXIS rel. 3.70. It was calculated 65 most dangerous combinations acc. to ENV 1993-11:1992 Euro code 3 with coefficient 1,35 in two basic combinations (bearing capacity and deformations). Model contains 385 macros 1D and 2D. Bearing capacity, deformations of the walls and ceilings • The text enclosure shows bearing capacity of the walls and ceilings in relevant load case combinations (the same in the graphic enclosure). The nodes were selected in all four corners on each floor elevation. • Horizontal deformation in x, y direction should not exceed 1/1000 of node elevation above support (of the structure as whole) acc. to recommended limit deformations in ENV 1993-11:1992 Euro code 3. The software evaluates extreme deformations in every direction separately (x, y, z) as well as maximum node rotation around axes x, y, z. Shopping-storing project in Bratislava
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