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Structural Engineering and Mechanics
  Volume 75, Number 3, August10 2020, pages 283-294

Multi-Beams modelling for high-rise buildings subjected to static horizontal loads
Luca Sgambi

    In general, the study of a high-rise building's behaviour when subjected to a horizontal load (wind or earthquake) is carried out through numerical modelling with finite elements method. This paper proposes a new, original approach based on the use of a multi-beams model. By redistributing bending and axial stiffness of horizontal elements (beams and slabs) along vertical elements, it becomes possible to produce a system of differential equations able to represent the structural behaviour of the whole building. In this paper this approach is applied to the study of bending behaviour in a 37-storey building (Torre Pontina, Latina, Italy) with a regular reinforced concrete structure. The load considered is the wind, estimated in accordance with Italian national technical rules and regulations. To simplify the explanation of the approach, the wind load was considered uniform on the height of building with a value equal to the average value of the wind load distribution. The system of differential equations' is assessed numerically, using Matlab, and compared with the obtainable solution from a finite elements model along with the obtainable solutions via classical Euler-Bernoulli beam theory. The comparison carried out demonstrates, in the case study examined, an excellent approximation of structural behaviour.
Key Words
    multi-beams system; high-rise building; structural modelling; structural mechanics
Faculty of Architecture, Architectural Engineering and Urban Planning, Université catholique de Louvain, Louvain-la-Neuve, Belgium

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