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Project in Detail

ARENA ZAGREB

Structural Design - Spans (eg bridges, stadiums, big sheds)
Zagreb, Croatia
UPI-2M, Croatia
2009
World Architecture Festival 2009 - Structural Design of the Year

roof_view 
Jasenko Rasol 


Arena Zagreb is multifunctional indoor hall with the footprint of 90340 sq. m. It is located in the southwestern part of Zagreb, Croatia, at one of the main city entrances. Also it lies opposite of popular Zagreb recreation and sports center Jarun. Arena Zagreb became a new city emblem in one of its main axes, offering to the citizens a large palette of amusement events. The unique shape of this building is strongly inspired by its significance in the city context, but also by its mega-structural characteristics that predefine main bearing elements. The shell shape is following the structure logic – it partly covers the inner space with curved columns. Basic shape and structural element of this hall are prestressed prefabricated reinforced concrete curved columns with the height up to 39 m. Eighty-six large curved prestressed, pre-fabricated concrete columns are carrying the main façade, mutually connected by illuminant semi-translucent polycarbonate envelope that enables for various light effects. They also support stands and carry suspended steel roof structure. Columns’ height goes from 26,5m to 38,8m. Span of steel roof structure equals 104m.
The major parts of the hall are: suspended steel roof structure, pre-stressed, prefabricated, reinforced concrete columns, and monolithic reinforced concrete structure of the stands, pit and entrance plateau.
Under the stands and field of play there is a garage with surface of approximately 30 000 m2 (with capacity of 817 vehicles). The garage lies on joint-less foundation slab with work dilatations. Number of work dilatations depends on available concrete fabrication plant (up to1000m3 per day). Part of work dilatations is performed in a way that one stripe (with width of 1 m) is being left in the middle and concreted subsequently. Such concept ensures undisturbed process of creep and shrinkage in initial faze. Avoiding of dilatation provides more simple (with easier quality control) and faster hydro-insulation montage in conditions of relatively high underground water. Above the garage there is 5 floor monolithic reinforced concrete structure of arena. Statically, it represents spatial frame with beams (span up to 10 m) and columns. On height of +5,0 (point of main pedestrian entrances) there is a support for 86 reinforced concrete prefabricated columns. After monolithisation of columns on mentioned height as well as on contact with beams of upper floors, they make one unit with monolithic structure. Reinforced concrete structure is made out of concrete of quality C30/37.
Statics scheme (cantilever with length up to 15m), load (2000 kN on the top of cantilevered beam), shape (curved), cross section (oval), size (39 x 8,5m) weight (up to 220 t) - all these data are the reason of using the mentioned technology in production of columns.
Columns are being produced on the site, using the concrete C50/60, in horizontal position inside the specially designed formwork and partly prestressed, in order to provide the fastest possible extracting from the formwork (30% of force). After extraction out of formwork, columns are being put in a „stand“, 12 cables are fully pre-stressed (1200 kN per cable) and injected.
At that moment, columns are ready for „verticalisation“ and transfer (using crane with capacity of 500 t – at the end of the arm outstretched 70 m, one will have necessary capacity) till planned location for embedding.
Columns are embedded on pre-built anchors (HALFEN, part of anchors on which column is stacked is embedded in column’s bottom) and temporarily stabilised (till monolithisation process is finished).
Monolithisation with spatial frame structure of the hall will provide necessary horizontal stability of columns in high seismic conditions (calculated acceleration of the ground 0, 27 g).
On the top of the column, there is a point for anchoring of cables predicted, which carry roof structure.
On full locked cable with diameter of 66 mm, calculated resistance of 2636 kN and range of 103, 7 m using vertical and diagonal hangers (full rod with diameter of 34 mm), roof structure is suspended.
Suspended steel roof structure is made out of steel HEB 450 profiles in major and secondary direction. Wind influence is dominant with uplift action on the roof with (wo= 0,7kN / sq.m; additional safety factor 1,5; shape factor c=-0,62). The weight of structure and stabilization truss have favourable influence on dynamics of structure, provides load disposal in case of asymmetric combination and ensure cable replacement.
In order to fulfil main characteristic of the ARENA ZAGREB – multi-functionality, it is necessary to predict locations where the equipment (sound speakers, spot lights etc) will be installed (hanged). For this Arena, total weight of such equipment equals 100 t. Deflection of structure for design loading (which includes elastic deformation of hanging points on top of the column) equals 33 cm.
Steel beams of major direction (their ends) are supported by elastomeric bearings embedded in stands structure. Elasticity of bearings provides for roof structure to „float“above the hall (uplift is blocked).

Lead Architect »

Mr ALAN LEO PLESTINA
UPI-2M
Croatia
 

Professional Credits »

3D
FREYA
Croatia

Acoustics Consultant
Mr Hrvoje Domitrovic
UNIVERSITY OF ZAGREB, FACULTY OF ELECTRICAL AND COMPUTER ENGINEERING
Croatia

Architect
Mr NENAD BORGUDAN
UPI-2M
Croatia

Architect
Mr ALAN LEO PLESTINA
UPI-2M
Croatia

Architect
Mrs TAMARA STANTIC BRCIC
UPI-2M
Croatia
tamara@upi-2m.hr

architect student
Mr MARKO NIKIC
UPI-2M
Croatia

architect student - scholar
Mr IVICA ZMISA
UPI-2M
Croatia

associate
Mr MARKO DJURAN
UPI-2M
Croatia

associate
Mr DARKO MAKAR
UPI-2M
Croatia

associate
Mr HRVOJE SARIC
UPI-2M
Croatia

associate architect
Mr IVAN CIKES
UPI-2M
Croatia

associate architect
Miss NEVENA KUZMANIC
UPI-2M
Croatia

associate architect
Mrs ANAMARIA PLESTINA
UPI-2M
Croatia

associate architect
Mrs SANJA TUSEK
UPI-2M
Croatia

associate architect
Mr DINKO UGLESIC
UPI-2M
Croatia

associate civil engineer
Mr KRESO CERAJ
UPI-2M
Croatia

associate engineer
Mr TOMISLAV ILICKOVIC
UPI-2M
Croatia

associate structural designer
Mr GORAN JANJUS
UPI-2M
Croatia

associate structural designer
Mr ANDREJ MARKOVIC
UPI-2M
Croatia

associate structural designer
Mr HRVOJE MIHAL
UPI-2M
Croatia

associate structural designer
Miss RUZICA PALIJAN
UPI-2M
Croatia

Client / Developer
INGRA
Croatia

colaborating architects
URBANE TEHNIKE
Croatia

consultant
Mr Carl A. H. Martin
BUDAPEST ARENA
Hungary

consultant
Mr Gergely Szutrély
BUDAPEST ARENA
Hungary

consultant
Mr Christos Kourtis
DECATHLON
Greece

consultant
Mr Jamie Peel
DECATHLON
Greece

consultant
Mr Mike Bedford
VANGARDIA CONSULTING
United Kingdom

consultant
Mr Jim Griffiths
VANGARDIA CONSULTING
United Kingdom

design of elevator
LIFT MODUS
Croatia

design of structural and physics characteristic
GAPP ARHITEKTURA
Croatia

electroinstallation design
IPROINZENJERING
Croatia

execution design of roof structure
A.K.I.
Croatia

fire detection design and carbonate monoxid detec
PROFECTUS
Croatia

fire protection design and labour safety design
INSPEKTING
Croatia

gas intsallation design and thermo technical inst.
KGH
Croatia

interior elements design
VERONICA
Croatia

smoke exhaustion design
BRODARSKI INSTITUTE OF ZAGREB
Croatia

sprinkler installation design
IPROINZENJERING
Croatia

Structural Engineer
Mr BERISLAV MEDIC
UPI-2M
Croatia
berislav_medic@upi-2m.hr

student CEng.
Miss REA GIASCHI
UPI-2M
Croatia

traffic design
TIGON
Croatia

visual identity and wayfinding system design
CAVAR-PAYER
Croatia

watersupply and sewage system design
IPROINZENJERING
Croatia