The influence of beam stiffness on seismic response of chevron concentric bracings

D’Aniello, Mario; Costanzo, Silvia

doi:10.1016/j.jcsr.2015.05.021

Cited by 69 publications

(51 citation statements)

References 33 publications

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“…The results show that the examined structures experience poor seismic performance without tensile yielding of bracing members. The authors highlighted that the flexural stiffness of the braced-intercepted beams in chevron bracing is mainly responsible for the poor performance of inverted V CBF, which is in line with the recent findings by [21]. The paper by Güneyisi and Gültekin [22] deals with the seismic performance of gate braced frames.…”

supporting

confidence: 73%

Nonlinear Behaviour, Design and Analysis of Steel Structures: Recent Findings and New Trends for the Next Generation of European Design Standards

D’Aniello¹

2017

TOCIEJ

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supporting

confidence: 73%

Nonlinear Behaviour, Design and Analysis of Steel Structures: Recent Findings and New Trends for the Next Generation of European Design Standards

D’Aniello¹

2017

TOCIEJ

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“…This value is larger than the value adopted in this study at design stage. Since EN1998-1 [8] does not recommend any value for the overstrength factor of the D-CBFs with chevron braces, this result can be a contribution for future discussion to revise the code; Regarding the overstrength ratio Ω 2 , associated to criteria of the seismic design, the median value is higher than 1.0 showing that the assumptions adopted in the seismic design stage does not provide structures with good level of optimization; In the opinion of the authors the inadequate behaviour of chevron CBFs is mainly due to the ineffectiveness of hierarchy requirements recommended by the current version of EN1998-1 [8], which do not guarantee adequate flexural stiffness to brace-intercepted beams in line with [28]; From economic point of view it was observed that the use of HSS in non-dissipative structural elements represented an effective solution to limit the constructional costs.…”

Section: Resultsmentioning

confidence: 99%

Dual-concentrically Braced Frames Using High Strength Steel – Seismic Response

Silva¹,

Rebelo²,

Silva³

et al. 2017

TOCIEJ

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Abstract:The recent technological advances on steel production process allowed introducing in construction market steel grades with significantly high yield strength. These new materials are known as High Strength Steel (HSS). The use of these steel grades offers economical and mechanical benefits compared with mild carbon steel (MCS). Consequently, their use is constantly increasing especially for seismic applications that are the rational field to exploit the high performance of HSS, by means of the "dual-steel" concept, which combines the HSS with MCS in order to provide overstrength to non-dissipative element and ductility to dissipative ones, thus controlling the global frame behaviour into a ductile overall failure mode. In this paper, a comprehensive parametric study devoted to investigate the seismic performance of Eurocode 8 compliant dual-steel chevron Dual-Concentrically Braced Frames (D-CBF) is presented and discussed. This structural typology is composed of two dissipative sub-systems acting in parallel, namely Moment Resisting Frames (MRFs) and Concentrically Braced Frames (CBFs). Static nonlinear pushover analyses were carried out in order to assess the seismic performance of the D-CBFs. The examined parameters cover both geometric and mechanical variables, as the type columns, span length, number of storeys and spectral shape. The analyses showed that the use of HSS in Eurocode 8 compliant D-CBFs is effective to avoid the damage in non-dissipative members. On the other hand, the use of HSS leads to design flexible members, especially for the braced-intercepted beams, resulting in poor performance of bracing members due to significant damage concentration. The economic evaluation shows that the use of HSS allows reducing the material consumptions and dropping the total constructional costs.

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“…Therefore, structures with strong and deformable beams are characterized by poor seismic performance, showing severe damage concentration in the braces under compression, while those in tension behave elastically. In particular, D'Aniello et al [15], based on an extensive parametric numerical study, provide an analytical relationship correlating the brace post-buckling compression strength to the mutual beam-to-brace vertical stiffness ratio K F . The brace post-buckling prediction curves obtained by both [22,25] (a) and [15] (b) are shown in Fig.…”

Section: Design Of Beamsmentioning

confidence: 99%

Concentrically Braced Frames: European vs. North American Seismic Design Provisions

Costanzo¹,

Landolfo²

2017

TOCIEJ

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Abstract:A critical review of seismic design provisions for concentrically braced frames (CBFs) in both European and North American (i.e. US and Canadian) codes is presented in this paper. Indeed, even though those codes are based on capacity design philosophy, different requirements and different approaches are used to guarantee the hierarchy of resistances between dissipative and non-dissipative elements, thus leading different overall seismic performance. In detail, the main issues critically discussed are (i) the ductility classes and the correlated force-reduction factors; (ii) the structural analysis methods permitted by different codes; (iii) the modelling aspects of braces; (iv) the detailing rules for both dissipative (bracing members) and non-dissipative elements. Synoptic tables summarizing the corresponding assumptions and requirements in different codes are provided.

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The influence of beam stiffness on seismic response of chevron concentric bracings

Cited by 69 publications

References 33 publications

Nonlinear Behaviour, Design and Analysis of Steel Structures: Recent Findings and New Trends for the Next Generation of European Design Standards

Nonlinear Behaviour, Design and Analysis of Steel Structures: Recent Findings and New Trends for the Next Generation of European Design Standards

Dual-concentrically Braced Frames Using High Strength Steel – Seismic Response

Concentrically Braced Frames: European vs. North American Seismic Design Provisions

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