consideration the influence of the longitudinal deformation of the columns on the main bearing system. Deformations of columns due to high compression have to deal with elastic deformation creeping and shrinkage of the concrete. Some deformation is eliminated by floor slab levelling, some has to be predicted by calculation. It is also necessary to take into the consideration the decreasing normal forces in the columns due to the decreasing effect of the live load depending on the number of the floors above. Influence of the settlement in the core area, which is higher than settlement in the perimeter columns, also plays a role in the designing of the bearing system. For seismic response calculation, different sub grade properties have to be used (stiffness or resistance of the soil in the case of the dynamic loads is higher). At least two models have to be calculated for one proportioning. With ESA-Prima Win we have the possibility to make many calculations in real time. Foundation slab design and calculation The internal force and the calculation of the foundation slab on the 3D model for global structure analysis was used here. The centre of the gravity forces of the building was not close to the centre of the contact area, as resulting from the basement layout. For this reason cantilever parts were designed. Now the centre of the gravity force comes close to the gravity centre of the resisting contact area. The proportioning was performed in the same model. Columns calculation Columns are calculated in a separate calculation. Normal forces are adopted from global structural analysis. Bending moments are adopted from floor slab calculation. For each type of column, a calculation is performed and influence due to live load is taken into consideration. Floor slab calculation Floor slabs are calculated in a separate model, punching shear and connection to the core walls is taken into account. In this model also bending moments in the columns are calculated. Around the columns a more dense mesh is used. On one side, there are decreased bending moments in the columns, and on the opposite side, there are increased positive moments in the floor slab. The proportioning of the slab in the columns is done based on sections and the reinforcement is distributed accordingly. Conclusion In order to obtain a solution of such a demanding structure, a very effective program for the calculation of internal forces calculation is needed. It must be able to prepare the structural model and to offer various possibilities to check the results. The incorporation of the proportioning in one package is also big advantage. ESA-Prima Win fulfils these requirements. 117
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