Abstract
In this paper the dynamic behaviour of a high-rise building with complex structural system is studied. In some cases, to optimize the building design, the horizontal stability of the building is accomplished by the contribution of several structural components. This is the case of the JuBi tower, the building studied in this paper. The horizontal stability of the building is accomplished by three cores and outer walls. The cores and the walls are connected through the floors and the foundation. The data recorded during the experimental campaign carried out in this building show a double-peak behaviour corresponding to two closely spaced modes in the translational directions. This is caused by the weak coupling between the structural components. To study this phenomena, in this paper, a yet unique double-beam model is used. The parameters of the model are tuned so as to resemble the experimental response of the building. Results of the model evidence that the weak coupling is caused by the beams and the foundation. Also, it is shown that the two closely spaced modes correspond both to bending shape modes.
Highlights
High-rise buildings can be subjected to vibrations caused by wind gusts
The horizontal stability of the building is achieved by means of three cores of different dimensions and outer walls that are coupled through the floors and the foundation of the building
A model based on a double-beam system is used to resemble the dynamic behaviour of a high-rise building
Summary
High-rise buildings can be subjected to vibrations caused by wind gusts. These vibrations may produce structural damage or lead to a drastic reduction of their fatigue life [1]. Li and Sun [12], presented a solution for free and forced response, for different loading conditions, of non-identical beams elastically connected with arbitrary boundary conditions. All these systems are widely used to study vibrations in many applications, until now, no attempt has been made to use double-beam system to model a high-rise building. This paper presents a unique yet double-beam model to study structural vibrations of a high-rise building subject to wind loading. The beams are modelled with non-identical mass, bending stiffness and internal damping These are connected with uniformly distributed visco-elastic elements that mimic the floors. The model shows that the closely spaced modes correspond to bending modes
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