RESEARCH ARTICLE


Comparison Between Different Design Strategies For Freedam Frames: Push-Overs and Ida Analyses



Rosario Montuori1, Elide Nastri1, Vincenzo Piluso1, Simona Streppone1, *, Mario D’Aniello2, Mariana Zimbru2, Raffaele Landolfo2
1 University of Salerno, Department of Civil Engineering, Fisciano (SA), Italy
2 University of Naples “Federico II”, Department of Structures for Engineering and Architecture, Naples (NA), Italy


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Creative Commons License
© 2018 Montuori et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this authors at the University of Salerno, Department of Civil Engineering, Via Giovanni Paolo II, 132, 84084, Fisciano (SA), Italy; Tel: 089963411; E-mail: sstreppone@unisa.it


Abstract

Background:

Modern seismic code design rules are known to be based on capacity design principles. They try to assure the damage to occur in the ductile parts of the structure, such as beam ends while the other have to remain in elastic range. Therefore, in the aftermath of design earthquakes, plastic deformations at member or connection level will imply high repair costs. In the last decades, innovative structural solutions based on the so-called supplementary energy dissipation strategy allow increasing the dissipative capacity of structures through equipping it with special damping devices. In the case of substitution of dissipative zones with dissipative devices the strategy takes the name of substitutive strategy. This is the case of Moment Resisting Frames investigated in this paper, where traditional dissipa-tive zones, are equipped with innovative low damage frictional devices. However, the current version of codes does not provide any rules to design of MRFs equipped with this type of friction joints.

Methods:

Therefore, this paper reports two design approaches amply investigated and compared. The first one is based on the application of the Beam-to-Column Hierarchy Criterion (BCHC) while the second one exploits the Theory of Plastic Mechanism Control (TPMC). The comparison between them is herein discussed on the basis of the results of nonlinear static and dynamic analyses.

Conclusions:

Structures equipped with low damage frictional connections show larger drift demand than conventional Moment Resisting Frames. However, differently from traditional structures, the larger displacement demand of MRFs equipped with friction joints does not corre-spond to structural damage, thus allowing the reparability of the structure.

Keywords: Seismic Design, MRF, Free from damage structures, Push-over, IDA, TPMC.