Rapid Seismic Economic Loss Assessment for Steel Concentrically Braced Frames Designed to Eurocode 8

ce/papers ◽  
2021 ◽  
Vol 4 (2-4) ◽  
pp. 1856-1863
Author(s):  
John Hickey ◽  
Brian Broderick
Keyword(s):  
Economic Loss ◽  
Eurocode 8 ◽  
Braced Frames ◽  
Loss Assessment ◽  
Concentrically Braced Frames ◽  
Concentrically Braced

scholarly journals Seismic Behaviour of EC8-Compliant Moment Resisting and Concentrically Braced Frames

Buildings ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 196 ◽  
Author(s):  
Silvia Costanzo ◽  
Roberto Tartaglia ◽  
Gianmaria Di Lorenzo ◽  
Attilio De Martino
Keyword(s):  
Design Procedure ◽  
Eurocode 8 ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Research Activity ◽  
Seismic Behaviour ◽  
Concentrically Braced ◽  
Dynamic Analyses ◽  
Moment Resisting ◽  
Energy Dissipation Capacity

The design procedure codified within current Eurocode 8 for dissipative moment resisting and concentrically braced frames have led to the design of massive systems characterized in the most of cases by poor energy dissipation capacity. The research activity presented in the current paper addresses the identification of the main criticisms and fallacies in the current EN 1998-1 for those seismic-resistant typologies. In this regard, the design provisions and codified rules for both moment resisting frames (MRFs) and chevron concentrically braced frames (CCBFs) are critically discussed and numerically investigated. Static and incremental dynamic analyses were performed on a set of 3 and 6-story frames designed compliant to EN 1998-1. The results from the numerical analyses are reported and discussed.

High strength steel in chevron concentrically braced frames designed according to Eurocode 8

2016 ◽  
Vol 124 ◽  
pp. 167-185 ◽  
Author(s):  
Andre Tenchini ◽  
Mario D’Aniello ◽  
Carlos Rebelo ◽  
Raffaele Landolfo ◽  
Luis Simões da Silva ◽  
...  
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Eurocode 8 ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Concentrically Braced

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

2017 ◽  
Vol 11 (1) ◽  
pp. 496-512 ◽  
Author(s):  
André Tenchini ◽  
Carlos Rebelo ◽  
Luis Simões da Silva ◽  
Luciano Lima
Keyword(s):  
Seismic Performance ◽  
High Strength Steel ◽  
Steel Production ◽  
High Strength ◽  
High Yield ◽  
Eurocode 8 ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Concentrically Braced ◽  
Steel Grades

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.

scholarly journals Earthquake-Induced Collapse Risk and Loss Assessment of Steel Concentrically Braced Frames

2018 ◽  
Vol 763 ◽  
pp. 90-97 ◽  
Author(s):  
Seong Hoon Hwang ◽  
Dimitrios G. Lignos
Keyword(s):  
Earthquake Engineering ◽  
Economic Losses ◽  
Seismic Events ◽  
Braced Frames ◽  
Loss Assessment ◽  
Concentrically Braced Frames ◽  
Probability Of Occurrence ◽  
Building Model ◽  
Wide Range ◽  
Concentrically Braced

This paper quantifies the collapse risk and earthquake-induced losses for a wide range of archetype buildings with special concentrically braced frames (SCBFs). The collapse risk and expected economic losses associated with repair, demolition and collapse are computed based on a performance-based earthquake engineering framework developed within the Pacific Earthquake Engineering Research Center. It is shown that the collapse risk of the steel SCBF archetypes may be significantly overestimated when the influence of the gravity framing system on the lateral frame strength and stiffness is ignored. It is also found that the building-specific earthquake loss assessment is significantly overestimated at low probability of occurrence seismic events (i.e., 2% probability of occurrence in 50 years) when the gravity framing system is not modeled explicitly as part of the nonlinear building model. For frequent and design-basis seismic events (i.e., 50 and 10% probability of exceedance over 50 years of building life expectancy), acceleration-sensitive nonstructural component repairs govern the building losses regardless of the employed nonlinear building model representation. For the same seismic events, steel brace flexural buckling contributes to structural repair losses.

Remarks on Seismic Design Rules of EC8 for Inverted-V CBFs

2018 ◽  
Vol 763 ◽  
pp. 1147-1154 ◽  
Author(s):  
Silvia Costanzo ◽  
Mario D'Aniello ◽  
Raffaele Landolfo ◽  
Attilio de Martino
Keyword(s):  
Design Procedure ◽  
Eurocode 8 ◽  
Structural System ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Design Rules ◽  
Concentrically Braced ◽  
Dynamic Analyses ◽  
Study Case ◽  
Nonlinear Dynamic Analyses

Chevron concentrically braced frames (C-CBFs) are expected to provide limited ductility in the framework of Eurocode 8: differently from North American codes, lower values of behavior factors are recommended by EN 1998 for C-CBFs than for other concentric bracing configurations (namely diagonal and cross bracings). The research presented in this paper is aimed at revising the design rules and requirements provided for by EN 1998-1 for C-CBFs in order to improve the ductility and the dissipative capacity of this structural system. The proposed design criteria are validated by means of nonlinear dynamic analyses performed on a study case. The results confirm the effectiveness of developed design procedure.

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