Archetype Dynamically Equivalent 3-DOF Model to Evaluate Seismic Performances of Intermediate Discontinuity in Frame Structures
Publication: Journal of Engineering Mechanics
Volume 148, Issue 3
Abstract
This paper investigated an intermediate discontinuity in a frame structure and its capability to mitigate the effects of seismic ground motions. The discontinuity represents a sudden change in the stiffness of the frame. The behavior of a structure after the introduction of discontinuity was studied by means of an archetype dynamically equivalent three-degree-of-freedom model. Two auxiliary systems were introduced to evaluate the effectiveness of the discontinuity. The first auxiliary system represented the structure without discontinuity. The second represented a system in which the part of the structure below the discontinuity is rigid. These two auxiliary systems allowed us to evaluate whether discontinuity is able to reduce the displacements of frame structure. The results were summarized using three gain coefficients that portray the ratio of displacements and drifts with and without the discontinuity. When the gain coefficients are less than unity, the discontinuity improves the dynamic behavior of the frame. To check the effectiveness of the proposed archetype model, results provided by an archetype and by spatial shear-type frames were compared. Then the archetype three-degrees-of-freedom system was used to conduct an extensive parametric analysis by varying geometrical and mechanical parameters. The results were organized in gain maps that represent the contour plot of the gain coefficients. Some maps were built using the spectrum compatibility criterion so that the results depend only on the seismic design spectrum. The gain maps show several ranges of the parameters’ region in which discontinuity is effective.
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Data Availability Statement
Data, models, or code generated or used during the study are available from the corresponding author by request, including all the data of the results and the source code of the numerical integration procedure.
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Journal of Engineering Mechanics
Volume 148 • Issue 3 • March 2022
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© 2022 American Society of Civil Engineers.
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Received: May 3, 2021
Accepted: Nov 11, 2021
Published online: Jan 5, 2022
Published in print: Mar 1, 2022
Discussion open until: Jun 5, 2022
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