Finite element code-based modeling of a multi-feature isolation system and passive alleviation of possible inner pounding

Ismail, Mohammed and López Almansa, Francisco and Benavent Climent, Amadeo and Pujades Beneit, Luis G. (2014). Finite element code-based modeling of a multi-feature isolation system and passive alleviation of possible inner pounding. "International Journal of Advanced Structural Engineering", v. 6 (n. 69); pp. 1-23. ISSN 2008-3556. https://doi.org/10.1007/s40091-014-0069-y.

Description

Title: Finite element code-based modeling of a multi-feature isolation system and passive alleviation of possible inner pounding
Author/s:
  • Ismail, Mohammed
  • López Almansa, Francisco
  • Benavent Climent, Amadeo
  • Pujades Beneit, Luis G.
Item Type: Article
Título de Revista/Publicación: International Journal of Advanced Structural Engineering
Date: September 2014
ISSN: 2008-3556
Volume: 6
Subjects:
Freetext Keywords: Seismic isolation; Adjacent structures; Self-recentering; Buffer; Hysteresis; Pounding
Faculty: E.T.S.I. Industriales (UPM)
Department: Ingeniería Mecánica
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The existing seismic isolation systems are based on well-known and accepted physical principles, but they are still having some functional drawbacks. As an attempt of improvement, the Roll-N-Cage (RNC) isolator has been recently proposed. It is designed to achieve a balance in controlling isolator displacement demands and structural accelerations. It provides in a single unit all the necessary functions of vertical rigid support, horizontal flexibility with enhanced stability, resistance to low service loads and minor vibration, and hysteretic energy dissipation characteristics. It is characterized by two unique features that are a self-braking (buffer) and a self-recentering mechanism. This paper presents an advanced representation of the main and unique features of the RNC isolator using an available finite element code called SAP2000. The validity of the obtained SAP2000 model is then checked using experimental, numerical and analytical results. Then, the paper investigates the merits and demerits of activating the built-in buffer mechanism on both structural pounding mitigation and isolation efficiency. The paper addresses the problem of passive alleviation of possible inner pounding within the RNC isolator, which may arise due to the activation of its self-braking mechanism under sever excitations such as near-fault earthquakes. The results show that the obtained finite element code-based model can closely match and accurately predict the overall behavior of the RNC isolator with effectively small errors. Moreover, the inherent buffer mechanism of the RNC isolator could mitigate or even eliminate direct structure-tostructure pounding under severe excitation considering limited septation gaps between adjacent structures. In addition, the increase of inherent hysteretic damping of the RNC isolator can efficiently limit its peak displacement together with the severity of the possibly developed inner pounding and, therefore, alleviate or even eliminate the possibly arising negative effects of the buffer mechanism on the overall RNC-isolated structural responses.

More information

Item ID: 35906
DC Identifier: http://oa.upm.es/35906/
OAI Identifier: oai:oa.upm.es:35906
DOI: 10.1007/s40091-014-0069-y
Official URL: http://link.springer.com/article/10.1007/s40091-014-0069-y
Deposited by: Memoria Investigacion
Deposited on: 07 Mar 2016 11:40
Last Modified: 07 Mar 2016 11:40
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