Dynamic damping of vibrations of structures of high-rise buildings of trunk-suspension type under seismic effects

Introduction. Suspended buildings with rigid core have a number of important design features, which consist in increased flexibility of their load-bearing elements. This can be used to reduce the seismic load on the structures of high-rise buildings. However, the technical difficulties of construction, as well as calculation methods that did not allow receiving data on the behaviour of suspended structures under seismic impact, served as an obstacle to the use of this system in the construction of high-rise buildings. Another approach to providing seismic protection for high-rise buildings is the installation of dynamic absorbers. Suspended structures in buildings with a rigid core can potentially act as dynamic absorbers. Modern methods of calculating mathematical models allow us to verify this assumption. This paper presents a new design solution for a suspended building with a rigid core, as well as an assessment of the influence of engineering parameters of the suspended part of the building on its seismic resistance.

Materials and methods. Numerical modelling of buildings with the proposed design solution under seismic impact was performed in the LIRA software package in a stepwise nonlinear setting. The effectiveness of the considered structural solution of the building is evaluated on the basis of data on the movements and accelerations of load-bearing structures under seismic impact.

Results. The patterns of the influence of the longitudinal stiffness of elastic links and the mass of the upper suspended block of floors on the displacement and acceleration of load-bearing structures of the building were found. A comparative analysis of deformation state of the structure during seismic action was performed, the optimal parameters of suspended structures were determined, allowing to reduce vibrations of the entire building.

Conclusions. A change in the mass of suspended floors and the rigidity of the connections between the elements of suspended building can lead to a decrease in displacements and accelerations of structures and damping system vibrations. Further research can be devoted to the analytical determination of the optimal parameters of suspended structures that ensure the dispersion of seismic action energy.

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