96 X1 Category 1: Buildings Introduction This project is a continuation of an existing homebuilding initiative in a Bratislava location. The building is divided into three parts, with each having a different number of storeys. The ground plan dimensions of the whole object are 96 m x 25 m and it is divided into five dilatation units. The maximal height of the building is 28.8 m. There are projected flats (third-storey and higher), offices (second-storey), shops (first-storey) and a car parking facility (two sub-levels) within this object. The motivation for this project is to have all the roofs designed as “greenery” so that the roof layers’ weight generates the load case on the roofs’ reinforced concrete slab. Geological conditions According to the results of the geological examination of the foundation’s soil, the following points were determined: the surface layer is created by dirt-sand with a clay addition, underneath which there is a gravel layer, and then at a depth of 13 m is a layer of neogen clay. Underground water was found at a 2.5 - 3.0 m depth during the geological examination. The water is in direct relation to the Danube river. Load bearing system The main load bearing system is a combination of reinforced concrete walls, columns, communication cores and slabs. The car parking facility has two underground storeys comprising reinforced concrete box with a foundation slab. The thickness of the reinforced concrete walls is 200 mm. There are various types of column dimensions. The thickness of the typical slabs is 200 mm, while for the roof slabs it is 250 mm. The foundation slab has three different thicknesses – 900 mm, 800 mm and 700 mm. Use of Scia Engineer software The calculation consists of static analysis regarding the vertical load, wind load and dynamic loads. For the static and dynamic (seismic) solutions for the structure, a 3D model was created for the whole object with Scia Engineer software using finite element method calculations. The loads were calculated according to Eurocode 1. The seismic load is considered as a standard designed spectrum of seismic response according to Eurocode 8. The seismic response of the structure was calculated using modal analysis, which consists of the eigen vectors solution and then the internal forces solution for each load case. Scia module Soilin was used for the calculation of the interaction of the foundation soil and reinforced concrete structure. Separate calculations were performed for the typical floor slabs. A particular model was created for each slab, while the internal forces and deflections with creep were calculated. Scia software helped us to decide on the foundation. In just a short time it is possible to make adjustments and to calculate the response of the concrete structure. Polyfunctional Building - Bratislava, Slovakia Software: Scia Engineer
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