Buckling-enabled composite bracing for damage-avoidance rocking structures

Kibriya, L. T.; Mariotti, C.; Kashani, Mohammad M.

doi:10.1016/j.ijmecsci.2019.105359

Cited by 7 publications

(2 citation statements)

References 36 publications

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“…Static redundancy, ductility and positive stiffness are among the most advantageous structural characteristics according to modern earthquake engineering. Yet, articulated structures with negative stiffness that are allowed to uplift have shown remarkable seismic performance in the past (Housner 1963;Makris 2014) and have motivated the creation of a new family of earthquake resilient post-tensioned systems (see for example Granello et al 2020 andKibriya et al 2020). This unconventional response, which can be generally described as rocking, is representative of the dynamic behaviour of a wide range of structures, from small museum exhibits to articulated modern buildings and bridges (Calio and Marletta 2003;Giouvanidis and Dimitrakopoulos 2017;Makris andVassiliou 2012, 2015).…”

Section: Introductionmentioning

confidence: 99%

Impact and clutch nonlinearities in the seismic response of inerto-rocking systems

Zhang

Thiers-Moggia

Mariotti

2022

Bull Earthquake Eng

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Rocking bodies can be found at all structural scales, from small museum exhibits to uplifting buildings. These structures, whose dynamic stability springs from the difficulty of mobilizing their rotational inertia, are ideal candidates for benefiting from the supplemental inertia provided by inerters. This benefit can be limited, however, if the inerter drives the structural response towards potentially undesirable motions by transferring back the kinetic energy accumulated within it at inconvenient times. To control this phenomenon, a clutching system can be employed to direct the interaction between the interter and the structure improving further its dynamic behaviour. To date, however, most of the studies dealing with clutching inerto-elastic or inerto-rocking systems under seismic excitation have adopted a rather simplistic idealisation of the clutch engagement-disengagement response. In this paper, we re-visit the impact effects on inerto-rocking structures and propose an improved mechanistic model of the clutching system. First, the effects of the inerter on the transition upon impact and the impact effects on the acceleration response of rocking blocks are analysed. Then, a set of original analytical expressions for rigid and flexible rocking structures equipped with a pair of clutched inerters are derived. The newly proposed models are used to examine the evolution of the energy dissipation in the device and the influence of key parameters like the clutch stiffness, gears play, viscous damping and dry friction on its response. We conclude by evaluating the behaviour of the detailed rocking model with clutched inerters to a set of realistic earthquake ground motions. Although important differences are observed in the evolution of energy dissipation and engagement response depending on the type and characteristics of the clutch model, largely comparable peak values of displacement are obtained. On the other hand, a more accurate representation of the clutch behaviour leads to potentially larger acceleration demands. Our analyses also show that, in general, the inclusion of the inerter results in higher coefficients of restitution, indicating lower energy dissipation during impact and that the infinite acceleration spikes predicted by Housner’s model can be ignored if impact forces are sufficiently distributed over time as to cause continuous velocity transitions, but sharp enough not to appreciably affect the rotation response.

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Section: Introductionmentioning

confidence: 99%

Impact and clutch nonlinearities in the seismic response of inerto-rocking systems

Zhang

Thiers-Moggia

Mariotti

2022

Bull Earthquake Eng

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“…This fact was already recognized by Housner [1], who motivated by the good performance of tall slender structures during several earthquakes, studied the planar dynamic behaviour of rigid bodies and derived analytical equations that describe their rocking motion. During the last decades, 5 this concept has been widely applied to the development of post-tensioned buildings that aim to limit the structural damage during severe earthquakes [2][3][4]. Popular among these applications are post-tensioned rocking walls [5,6], where the structural members are free to uplift and rock while post-tensioned tendons are incorporated to increase the lateral strength and recentring capabilities of the structure.…”

Section: Introductionmentioning

confidence: 99%

Dynamic response of post-tensioned rocking structures with inerters

Thiers-Moggia

Mariotti

2020

International Journal of Mechanical Sciences

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Post-tensioned rocking systems have proved to be highly effective in controlling structural damage during strong ground motions. However, recent events have highlighted the importance of looking at both the structural and non-structural components within a holistic framework. In this context, the high rotations and accelerations associated with the rocking motion can cause significant non-structural damage and affect the performance and functionality of the entire system. In this paper, we examine analytically the fundamental dynamics of post-tensioned rocking structures and investigate the benefits of using supplemental rotational inertia to reduce their seismic demands and improve their overall performance. The newly proposed strategy employs inerters, a mechanical device that develops a resisting force proportional to the relative acceleration between its terminals. Analyses conducted for a wide range of acceleration pulses and real pulse-like ground motions show that post-tensioned structures equipped with inerters consistently experience lower demands and have reduced probabilities of exceeding limit states typically associated with damage. Importantly, the new vibration control strategy advanced in this paper opens the door for an expedient modification of the fundamental dynamic response of rocking systems without altering their geometry.

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Seismic Behaviour of Damaged Steel Frames Retrofitted with Inerters

Zahra,

Málaga-Chuquitaype

2024

Lecture Notes in Civil Engineering

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Buckling-enabled composite bracing for damage-avoidance rocking structures

Cited by 7 publications

References 36 publications

Impact and clutch nonlinearities in the seismic response of inerto-rocking systems

Impact and clutch nonlinearities in the seismic response of inerto-rocking systems

Dynamic response of post-tensioned rocking structures with inerters

Seismic Behaviour of Damaged Steel Frames Retrofitted with Inerters

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