Office building in Madrid (Oria Tower)

Fhecor – Spain

Office building in Madrid (Oria Tower)

Building use

Office building

Country/Region

Spain

Overview

The 25 story office building Oria Tower stems from the rehabilitation of a former industrial site. The old industrial buildings will be restored and converted, and two additional office buildings are being added to the site. With construction works starting in late 2023 the project is expected to finished in about 2 years.

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

Construction date: 2023-2025
Number of stories: 25
Gross floor area: 40,000m2
Adopted design code: Eurocode
Engineer(s): Fhechor (engineers) Ortiz-Leon (architects)
Contractor(s): –

Issue and/or innovation

The goal is the maximization of the available floor area for the tower, with columns that take up the least possible amount of space. For this reason, they change in diameter with the increased height of the tower, progressively decreasing their presence in the space. Also the composite element inside the column is optimized so as to save material and cost, so every column is almost unique in terms of external size, size of the encased H steel profile, number and size of the rebars.

Reason for composite solution

The composite solution is used to achieve the goal of reducing the area of the columns. A cost assessment was done considering also concrete or all-steel columns but construction and economic reasons were in favor of composite construction.

Specific solution/technical details

The solution adopted consists of a heavy HEM profile encased in reinforced concrete. The steel is S355 with sections ranging from HD320x451 to HD320x127. HA-50 concrete is used to create the columns that range from 70 to 90 cm in diameter. Depending on the floor level of the column range from, the reinforcement of concrete is made with 26 rebars with 25mm of diameter down to 14 rebars with 20mm of diameter, confined by a 8mm stirrup.

Impact or effectiveness

To keep the most heavily loaded columns in the diameter of 0.80 m, it has been necessary to embed metal profiles that conduct the loads by adhesion into the rest of the concrete structure. Likewise, some of the supports collect tensile forces due to the roof, which are also transmitted through metal profiles embedded in the horizontal supports. The transfer is provided for by adhesion, extending the mixed profiles in this case only up to level zero, in which the tractions are comfortably supported by the weight of the slabs. The embedded metal profiles collaborate constructively in the assembly of the roof, by allowing the support of the lattices independently of the concreting of the supports.

References / Technical Papers Content

A. Vidal Vacas, A. Serrano Corral, “Banco Popular new headquarters building in Madrid”, Hormigon y Acero 2018, 69(248) 1-25, https://doi.org/10.1016/j.hya.2017.06.001