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BY 4.0 license Open Access Published by De Gruyter Open Access August 18, 2021

An analytical formulation to evaluate natural frequencies and mode shapes of high-rise buildings

Giuseppe Nitti , Giuseppe Lacidogna EMAIL logo and Alberto Carpinteri

Abstract

In this paper, an original analytical formulation to evaluate the natural frequencies and mode shapes of high-rise buildings is proposed. The methodology is intended to be used by engineers in the preliminary design phases as it allows the evaluation of the dynamic response of high-rise buildings consisting of thin-walled closed- or open-section shear walls, frames, framed tubes, and dia-grid systems. If thin-walled open-section shear walls are present, the stiffness matrix of the element is evaluated considering Vlasov’s theory. Using the procedure called General Algorithm, which allows to assemble the stiffness matrices of the individual vertical bracing elements, it is possible to model the structure as a single equivalent cantilever beam. Furthermore, the degrees of freedom of the structural system are reduced to only three per floor: two translations in the x and y directions and a rigid rotation of the floor around the vertical axis of the building. This results in a drastic reduction in calculation times compared to those necessary to carry out the same analysis using commercial software that implements Finite Element models. The potential of the proposed method is confirmed by a numerical example, which demonstrates the benefits of this procedure.

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Received: 2021-05-21
Accepted: 2021-07-08
Published Online: 2021-08-18

© 2021 Giuseppe Nitti et al., published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 International License.

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