The maximum seismic response of torsionally coupled plan asymmetric structures can be rationally visualized and computed through a Mohr Circle Response Spectrum Analysis (MCRSA). This is done combining the graphic modal properties of the torsional dynamic equations of motion with the structural earthquake demand in terms of a displacement spectrum as a function of the modal eigenvalues SD(ω2). A compact representation of the modal properties and of the response envelope is built and visualized in the Mohr plane. The maximum modal responses are then combined using a graphic adaptation of the SRSS and CCQ combination rules based on the elastic response spectrum. This Graphic Dynamic rule proves to be an effective response prediction tool, and is particularly suited to estimate the response of seismic base isolation systems.
Mohr circle-based graphical vibration analysis and earthquake response of asymmetric systems / Faggella, Marco; Gigliotti, Rosario; Morrone, Carmen; Spacone, Enrico. - In: PROCEDIA ENGINEERING. - ISSN 1877-7058. - 199:(2017), pp. 128-133. (Intervento presentato al convegno 10th International Conference on Structural Dynamics, EURODYN 2017 tenutosi a Rome, It nel 2017) [10.1016/j.proeng.2017.09.194].
Mohr circle-based graphical vibration analysis and earthquake response of asymmetric systems
Gigliotti, Rosario;
2017
Abstract
The maximum seismic response of torsionally coupled plan asymmetric structures can be rationally visualized and computed through a Mohr Circle Response Spectrum Analysis (MCRSA). This is done combining the graphic modal properties of the torsional dynamic equations of motion with the structural earthquake demand in terms of a displacement spectrum as a function of the modal eigenvalues SD(ω2). A compact representation of the modal properties and of the response envelope is built and visualized in the Mohr plane. The maximum modal responses are then combined using a graphic adaptation of the SRSS and CCQ combination rules based on the elastic response spectrum. This Graphic Dynamic rule proves to be an effective response prediction tool, and is particularly suited to estimate the response of seismic base isolation systems.File | Dimensione | Formato | |
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