Plastic design of eccentrically braced frames, II: Failure mode control

Mastrandrea, Luigi; Piluso, Vincenzo

doi:10.1016/j.jcsr.2008.10.001

Cited by 47 publications

(26 citation statements)

References 7 publications

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“…These results are particularly useful in the development of a design procedure which is the natural extension to KB-structures of a design methodology already suggested for seismic-resistant frames (Mazzolani and Piluso [1]) and for eccentrically braced frames (Mastrandrea et al [2]). Therefore, this methodology constitutes a general design approach which allows the control of the failure mode for any type of seismic-resistant structure.…”

Section: Discussionmentioning

confidence: 95%

“…The expressions of the kinematically admissible multipliers  im (2) and  im (3) , and of the slopes  im (2) and  im (3) , of the mechanism equilibrium curves corresponding to type 2 and type 3 mechanisms, respectively, can be obtained by means of the same procedure.…”

Section: Equilibrium Curves Of Analysed Mechanismsmentioning

confidence: 99%

“…This is obtained by means of the limit analysis, which allows to define appropriate design conditions and contemporary provides useful tools to account for local ductility demands. This methodology has already been developed in the case of moment resisting frames (Mazzolani and Piluso [1]) and eccentrically braced (Mastrandrea et al [2]), providing satisfactory results, so that it is proposed as a general design approach for seismic resistant structures.…”

Section: Introductionmentioning

confidence: 99%

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Plastic Design and Seismic Response of Knee Braced Frames

Conti¹,

Mastrandrea²,

Piluso³

2009

Volume 5 Number 3

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ABSTRACT:In this paper a design methodology aiming at the development of a collapse mechanism of global type for seismic resistant knee braced frames is presented. The proposed methodology is based on the assumption that the beam, brace and knee sections are known, while the column sections constitute the unknowns of the design problem. The design requirements are derived by means of the kinematic theorem of plastic collapse. In particular, column sections are obtained by imposing that the mechanism equilibrium curve corresponding to the global mechanism has to lie below those corresponding to all the undesired mechanisms within a displacement range compatible with the local ductility supply of knee elements.The proposed design procedure has been implemented in a computer program and applied to design some knee braced frames. Successively, static and dynamic non-linear analyses have been carried out aiming at the evaluation of the performance of the designed braced frames in terms of collapse mechanism developed under seismic forces, energy dissipation capacity and global and local ductility demands.

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Section: Discussionmentioning

confidence: 95%

Section: Equilibrium Curves Of Analysed Mechanismsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Plastic Design and Seismic Response of Knee Braced Frames

Conti¹,

Mastrandrea²,

Piluso³

2009

Volume 5 Number 3

Self Cite

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“…In this paper, a design methodology aimed at the failure mode control, already successfully applied with reference to MRFs [1,2], CBFs [3,4] EBFs [5,6] and KBFs [7], has been implemented for MRF-CBF dual systems. In addition, structures with different number of storeys (4, 6 and 8) have been dimensioned according to the described design procedure.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, in order to design structures able to assure the development of a collapse mechanism of global type under destructive seismic actions, a rigorous application *Address correspondence to this author at the Department of Civil Engineering, University of Salerno, Italy; Tel: +39+089+964108; Fax: +39+089+964108; E-mail: v.piluso@unisa.it of capacity design principles is needed, requiring more sophisticated design procedures. In particular, sophisticated design procedures assuring a collapse mechanism of global type have been already successfully developed with reference to moment-resisting frames (MRFs) [1,2], concentrically braced frames (CBFs) [3,4], eccentrically braced frames (EBFs) [5,6] and knee braced frames (KBFs) [7].…”

Section: Introductionmentioning

confidence: 99%

Failure Mode and Drift Control of MRF-CBF Dual Systems

Giugliano¹,

Longo²,

Montuori³

et al. 2010

TOBCTJ

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Abstract:In this paper, a new method for designing moment resisting frame (MRF) -concentrically braced frame (CBF) dual systems failing in global mode is presented. Starting from the analyses of the typical collapse mechanisms of such structural typology subjected to seismic horizontal forces, the method is based on the application of the kinematic theorem of plastic collapse. Beam and diagonal sections are assumed to be known quantities, because they are designed to resist vertical loads and horizontal forces, respectively. Therefore, the column sections are the only unknowns of the design problem. Column sections are obtained by imposing that the equilibrium curve corresponding to the global mechanism has to lie below all the equilibrium curves corresponding to the undesired collapse mechanisms within a displacement range compatible with the local ductility supply of dissipative elements. Such procedure has been applied to design several MRF-CBF dual systems and has been validated by means of non-linear static analyses aimed to check the actual pattern of yielding.

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On the plastic analysis of concentrically braced frames with shear panel, obtaining predetermined collapse mechanism

Hamed

Mofid

2014

Structural Design Tall Build

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Conventional design methods do not ensure that the desired collapse mechanism is developed at target displacement. In this paper, a case study is presented to analyze concentrically braced frames with steel shear panel (CBFSP). Also, extensive investigation in the failure modes are made, to have the global yielding mode at the final state. For this purpose, each of one-story, three-story, six-story and nine-story CBFSP models were decomposed into three parts where the members' closed-form equations of internal forces were identified and superimposed. On the basis of the kinematic theorem of plastic collapse, the possible mechanisms and the related energy equations were defined to estimate the lateral load multiplier. First, the shear panels, columns, vertical and horizontal boundary elements were designed using the values of internal forces and seismic loads. Next, sections of the beams and braces were selected by constraining, where the mechanism equilibrium curve of the desired mechanism had to be placed below the others within the admissible roof displacement. Finally, for assessment of the precision of the method, results of the pushover analysis of the finite element models were compared with the theoretical ones. The findings show that, despite more effort for design, the investigated method is reliable and satisfactory.

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Plastic design of eccentrically braced frames, II: Failure mode control

Cited by 47 publications

References 7 publications

Plastic Design and Seismic Response of Knee Braced Frames

Plastic Design and Seismic Response of Knee Braced Frames

Failure Mode and Drift Control of MRF-CBF Dual Systems

On the plastic analysis of concentrically braced frames with shear panel, obtaining predetermined collapse mechanism

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