Inspirations in Engineering 2013 - page 30

Category 1: Buildings
Description of the project
The building is designed as a reinforced concrete
monolithic skeleton structure with bracing walls of the
vertical core. It has 3 underground floors and 18 above-
ground floors.
The foundation slab is assessed on the 5 m-thick gravel
layer. Under the gravel there is a neogene clayey layer
more than 30 m thick. The whole building was designed
as one unit, without a dilatation joint between the high
part and the underground part. The measurements of
the underground part are 96 x 52 m. The foundation
slab under the high part working together with
reinforced concrete piles is 1,200 mm thick, under the
columns there is a mushroom head for punching efforts.
The foundation slab under the low part is 400 mm thick.
The maximum underground water lifting power is higher
than the dead load of the low part, so the structure is
protected against underground water pressure by piles.
All peripheral walls and slabs are designed as watertight
reinforced concrete with the maximum crack width
0.25 mm.
The vertical bearing elements are reinforced concrete
monolithic columns and walls. C40/50 concrete is used
for the columns, C30/37 for the other vertical structure
and C25/30 for the typical upper floor slabs. The walls
of the vertical communication core ensure the stability
of the building against wind and seismic load. The
maximum seismic acceleration of 0.6 m/s
was used
for calculation. The span of 7.8 x 8.1 m is used for the
columns. The horizontal bearing elements are beamless
solid slabs with reinforced concrete mushrooms heads.
The thickness of the slabs for floors is 200 mm and the
mushrooms heads ensure the allowed deflections and
the shearing efforts. The slab over the 1st underground
floor is designed for 33 kN/m
of dead load because
there is a park with trees provided.
The layouts of the 1st and 2nd floors do not have the
same shape as the other upper floors, that is why they
are hung on the 3rd floor slab. This slab was reinforced
by beams for this reason. The length of the peripheral
columns on the 1st, 2nd and 3rd floors supporting the
whole building is 12 m.
The process of work started in January 2012 and the
expected deadline is June 2013. The excavation, piles
and whole concrete bearing structure were completed in
September 2012.
Use of Scia Engineer
Scia Engineer software was used for the static and
dynamic analysis. The EN standards were used for
calculation. One complete model of the main structure
and some partial models for particular floors were made,
and all bearing elements are designed. The Soilin
module was used for the settlement calculations and for
the contact tensions. Scia Engineer allows for the model
of the complicated building to be produced very easily.
It allows for a number of alternatives of the structure
as well. There were more designs in the process of
the work according to the client and architect demands
and Scia Engineer permits changing of the structure
very easily. The real deflections of the structure were
measured on site, and the results are very near to the
calculated deflections.
Software: Scia Engineer
Forum Business Center - Bratislava, Slovakia
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