Multifunctional building 2A
Statika stavieb
Bajzova 6
82108 Bratislava
Slovakia
Tel.: +421243411703
Fax: +421243411703
Contact:
M. Jozef Baran
Email:
After finishing my studies at the Slovak Uni-
versity of Technology in 1976, I started to
work as a civil engineer.
Untill 1990, I
worked in a company as the responsible
civil engineer. Since 1990, I have become an
independent structural engineer. I am a
member of the Slovak Chamber of Civil
Engineers.
In my office we are working with 3 to 10
civil engineers according the volume of
work.
For my calculations I use the following soft-
ware: SCIA FEAT Release 2002, FINE GEO4
and in cooperation
with other colleagues
IDA Nexis 32 (ESA-Prima Win). This year I
will start with SCIA•ESA PT.
In general
A block of apartments will be erected in the
near future. At the moment all project data
are prepared to obtain a building licence. The
main investor of the building is IPEC s.r.o.
Basic parameters of the building
Total numbers of floors is 20. Eighteen above
ground level and three floors below ground
level. The total height of the building is 64.33
m. The total area is more than 10 000 m²,
approximately 600 m² per floor.
The main bearing system of the building is
created from cast in place reinforced con-
crete. In the middle of the building is located
a core with the dimensions 6.90 m.x 10.00 m,
the walls thicknesses go from 400 mm to 200
mm. The dimensions of the square columns
are 300 x 700 mm to 300 x 400 mm in the
upper part of the building. Floor slabs are
beamless with a thickness of 200 mm.
Method of the designing for detail
design
For the calculation of the main bearing sys-
tem based on architectural drawing, a 3D
model
was created. For the separate parts,
some models were created in the FEAT pro-
gram.
The results from the global calculation were
included into the separate models as external
load or are included into the proportioning.
Loads
The self weight of the structure is considered
according the thickness of the bearing parts.
The additional dead load lies in the range of
1.5 to 3.0 kappa. The live load on common
floors is 1.5 kPa.
Global structural calculation
The main bearing systemof the building is cal-
culated by a 3D computational
model created
by the finite element method. Floor slabs are
modelled but for computational reasons only
a very large mesh is used. For linear seismic
response calculation, the response spectra
method is used. For the combination of the
modal responses, the CQC method is used.
The proportioning of the foundation slab and
the core walls is done in this model
without
any other influence or consideration.
All
calculation is
performed
by
NEXIS
32.50.05 program (ESA-Prima Win).
Structural analysis and design
Foundation: The geological structure of the
concerned territory is built-up by Palaeozoic
granitoide rocks. The shallow foundations - a
foundation slab of 1.2 m thickness - has been
designed. Concrete C30/37, Reinforcement:
fyk = 460 MPa
Design and calculation of the
foundation slab
Internal force and calculation of the founda-
tion slab on 3D
model for global structure
analysis was used here.
Upper structure
Regarding the structural point of view this is
the combined system of a wall and skeleton
structure. Both the basement and the ground
floor vertical load bearing elements are
monolithic reinforced concrete columns com-
pleted with reinforced concrete walls of 300
or 250 mm thickness serving as a stiffening
walls at the same time.
Horizontal load bear-
ing structures are beamless monolithic rein-
forced concrete slabs 200 mm thick.
Concrete C30/37, Reinforcement: fyk = 460
MPa. Concrete for columns C40/50, Rein-
forcement: fyk = 460 MPa
Calculation of the columns
Columns are calculated in a separate calcula-
tion.
Normal forces are adopted from global
structural analysis. Bending
moments are
adopted from floor slab calculation per-
formed by FEAT program. For each type of
column, a separate calculation is performed
and influence due to live load is taken into
consideration.
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Company
Project
Multifunctional building 2A
Statica stavieb
SCIA User Contest 2005 / Civil Engineering
2
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