Two formidable 21-stories-high skyscrapers at the side of one of Ljubljana’s main traffic arteries are currently the highest residential buildings in Slovenia and offer stunning 360 panoramic vistas across the city and towards the mountains in the north.
The business and residential complex Spektra rises above an extended ground floor devoted to commercial and service sector activities, while the basement underneath provides four stories of parking space with 420 parking spots for residents and visitors and over 500 parking spots for bicycles. Inside the 85-meters-high skyscrapers are 208 individual apartments ranging from 23 to 120 m2 in size.
Identifying the appropriate seismic design for such a mighty building presented a particular challenge. We developed a solution that included a large reinforced-concrete core, which encompasses the staircase, elevator shafts, and the entire hallway connecting the apartments. The uninterrupted core spans the entire height of the building, while the thickness of its walls becomes gradually thinner – from 50 centimeters on the ground floor to 20 centimeters on the top floors of the building.
We chose entirely prestressed slabs for the two skyscrapers because of two specific advantages they offer: a lower overall mass of the building (ensuring lower seismic loads) and a shorter construction timeframe, which were essential when building Slovenia’s tallest skyscrapers.
We designed the entire project using advanced BIM technologies.
Project typeNew buildingLocationLjubljana, SloveniaArea45,000 m²Inv. value€60,000,000Year(s)2018-2023ServicesConcept design, building permit design, execution design, as built documentationArchitectureScapelab d.o.o.InvestorSpektra Invest d.o.o., SloveniaPhotosMiran Kambrič
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