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http://dx.doi.org/10.12989/eas.2022.22.5.517

Large deformations of a flexural frame under nonlinear P-delta effects  

Afshar, Dana (Department of Technology and Engineering, Imam Khomeini International University)
Afshar, Majid Amin (Department of Technology and Engineering, Imam Khomeini International University)
Publication Information
Earthquakes and Structures / v.22, no.5, 2022 , pp. 517-526 More about this Journal
Abstract
In this paper, nonlinear P-delta effects are studied on the seismic performance, and the modal responses of a flexural frame, considering large deformations. Using multiple scales method, the nonlinear differential equations of motion are estimated, and the nonlinear interactions between the frame's degrees of freedom are outcropped. The results of time and frequency domain analyzes of a dynamic model are examined under internal resonance cases, and the linear and nonlinear responses are investigated in each modal cases. Also, changing the modal responses with respect to the amplitude and frequency of the harmonic forces is evaluated. It is shown that the dominant absorption of energy is in the first natural frequency of the frame, in the case of earthquake excitation, and when a harmonic force is applied to the frame, the peaks of the frequency domain responses depending on the frequency of harmonic force are in the first, and second or third natural frequency of the structure.
Keywords
flexural frame; multiple scales method; nonlinear interaction; P-delta effect;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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