Dynamic and Seismic Protection of Rigid-Block-Like Elements and Structures on Deformable Ground with Mass-Damper Dynamic Absorbers
Publication: Journal of Engineering Mechanics
Volume 146, Issue 6
Abstract
Some elements and structures can be modeled as rigid blocks. To reduce their likelihood of overturning such block-like elements, structures can be coupled with safety devices. In this paper, a model of a rigid block placed on a deformable soil is coupled with a pendulum working as mass-damper dynamic absorber. The deformable ground is modeled as a continuous bed of vertical linear springs and dashpots. To assess the effectiveness of the mass-damper dynamic absorber, a parametric analysis is performed by numerically integrating the equations of motion and considering one-sine pulse and seismic excitations. In the analyses, the geometrical characteristics of the block, the mass and length of the pendulum, and the stiffness of the soil are taken as variable parameters. Under one-sine excitation, the comparison of overturning spectra obtained for blocks with and without a mass-damper dynamic absorber demonstrates the effectiveness of the chosen protection device, especially for soils characterized by high stiffness. The beneficial effect of the mass-damper dynamic absorber on the dynamics of the rigid block under seismic excitations is evaluated by comparing the rocking maps obtained for blocks that are and are not equipped with mass-damper dynamic absorbers. In addition to the reduction of the overturning events of the block, the results show that the protection device has the positive effect of reducing the amplitude of the rocking angle.
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Data Availability Statement
Some or all of the data, models, or code generated or used during the study are available from the corresponding author by request. Specifically the following data are available: (1) the registered earthquake data indicated in Fig. 15; (2) all of the data of the results; and (3) the source code of the numerical integration procedure.
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Published In
Journal of Engineering Mechanics
Volume 146 • Issue 6 • June 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jul 18, 2019
Accepted: Jan 6, 2020
Published online: Apr 3, 2020
Published in print: Jun 1, 2020
Discussion open until: Sep 3, 2020
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