Risk estimation of rocking components subjected to ground motions

Espinosa, M

Abstract:: The behaviour of a rocking object has fascinated the scientific community for many years. This is partly because its study is applicable to a wide variety of structural and non-structural elements, i.e., hospital equipment, industrial technology, bridge piers or art preservation. Rocking motion typically occurs in objects that are unrestrained at their base and are disturbed from their equilibrium position. However, despite the intuitive nature of rocking motion, it is in fact a high...
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APA Style

Espinosa, M. (2018). Risk estimation of rocking components subjected to ground motions [PhD thesis]. University of Oxford.

MLA Style

Espinosa, M. Risk Estimation of Rocking Components Subjected to Ground Motions. 2018. University of Oxford, PhD thesis.

Chicago Style

Espinosa, M. 2018. “Risk Estimation of Rocking Components Subjected to Ground Motions.” PhD thesis, University of Oxford.
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Files:: María García Espinosa.pdf

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Authors

+ Espinosa, M More by this author

Division:: MPLS
Department:: Engineering Science
Role:: Author

Contributors

+ Chatzis, M

Role:: Supervisor

+ EC, FP7-PEOPLE-2013, Marie Curie, Career Integration Grant, ’RERCSGM’ More from this funder

Grant:: 618359

DOI:: 10.5287/ora-9ra982ybb
Type of award:: DPhil
Level of award:: Doctoral
Awarding institution:: University of Oxford

Language:: English
Keywords:: stochastic analysis

non linear dynamics

earthquake generation

Rocking
UUID:: uuid:bbe4ec8e-b076-4c9c-bc61-f4034120a12f
Deposit date:: 2019-03-26
ARK identifier:: ark:/29072/ora_bbe4ec8eb0764c9cbc61f4034120a12f

Related item:: Examining the energy loss in the inverted pendulum model for rocking bodies
Description:: Understanding the mechanisms that may lead to failure of rocking bodies is significantly important in quantifying and minimizing the associated risk. The most common model to describe the rocking problem is the inverted pendulum model (IPM) proposed by George W. Housner, which has been followed by multiple researchers. It is often claimed that the IPM is an acceptable model if behaviors such as sliding, uplifting, deformability, and the three-dimensional nature of the response can be restrained mechanically. However, even in a suitably chosen case in which the previous may indeed have a minimal effect in the response, there are still uncertainties with regard to the assumption introduced in the IPM of how energy is lost during impacts. This paper focuses on this assumption and investigates the effects in the stability of rocking bodies. The effect of this assumption is discussed, showing that the associated uncertainty points to whether a rocking body would survive or fail when subjected to a ground excitation. A method that quantifies this uncertainty by making use of a dynamic property of the rocking system is introduced.
Related item:: Energy loss in systems of stacked rocking bodies
Description:: Free-standing bodies, which rock in response to dynamic base excitations, can be found in a wide range of applications. There are many instances, for example a museum artifact seated on a support pedestal, where both the object and its support are free-standing, resulting in a dynamic system where both bodies can rock with respect to their contact interfaces. This paper analyzes the rich dynamics of systems of two stacked rocking bodies. It focuses on the location of the resultant impulses between bodies during impact, considering their effect on the overall stability of the system. The widely-used assumption that the impulses occur at the future rocking corners is shown to be the least conservative scenario and often leads to underestimating the likelihood of failure. The optimum configuration of two stacked blocks is found to be highly sensitive to the characteristics of the input motion and to the location of the impulses

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Copyright holder:: Espinosa, M

Licence:: CC Attribution-NonCommercial-NoDerivatives (CC BY-NC-ND)

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Risk estimation of rocking components subjected to ground motions

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Risk estimation of rocking components subjected to ground motions

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