Office building in Bydgoszcz

Building use

Office building

Country/Region

Poland

Overview

The building is a speculative investment of a local developer. Built with a tight budget the building maximizes the opportunities offered by the construction materials to make the most efficient use of their properties.

Basic information (construction date, number of stories, gross floor area, adopted design code, engineer(s), Contractor(s), etc.)

Construction date: 2018-2021
Number of stories: 5
Gross floor area: 22,500m2
Adopted design code: –
Engineer(s): Łukasz Gąska
Contractor(s): ARD

Issue and/or innovation

The innovative aspect of the building is the optimization of the structural solutions for beams in order to achieve the ideal exploitation of it height, favoring high ceilings. In order to do that, MEP network of horizontal ducts are concentrated in “MEP corridors”, using a slim-floor system only where needed, while the rest of the construction is made with normal reinforced concrete beams.

Reason for composite solution

The composite solution consists in a prefabricated composite beams for the construction of slimfloor systems. This allows the creation of “MEP corridors” only in certain locations of the building, as shown in the illustration provided.

Specific solution/technical details

The prefabricated composite beam is built with an inverted TT steel section of 10mm of thickness reinforced with C60/75 concrete. The steel bottom flange is 78cm wide. The floor surface is created with hollow-core prefab concrete slabs that lay on the bottom flange of the composite beam for 15 cm each. The floor assembly is then finished with rebars that pass through the composite beam pre-made holes, allowing the creation of a solid slab.

Impact or effectiveness

Classic reinforcement concrete beam had 50 cm height but the composite slim-floor solution only needed 27, so providing 23 cm of extra space above the false ceiling for the MEP corridors.