since 05 February 2011 :
View(s): 754 (8 ULiège)
Download(s): 1265 (11 ULiège)
print        
Farzad Saghafi, Ali Seyedkazemi, Hossein Mehrabian & Morteza Hosseinali Beygi

Comparison of Seismic Behavior of Eccentrically Braced Frames with Vertical and Knee Links in Retrofitting the Reinforced-Concrete Buildings with Intermediate Moment-Resisting Frame Systems

(Volume 85 - Année 2016 — Actes de colloques — Special edition)
Article
Open Access

Attached document(s)

original pdf file
Keywords : eccentrically braced frames (EBFs), knee links, retrofitting, seismic performance evaluation, single link beams

1Given the fact that some reinforced-concrete (RC) buildings have not met resistance against seismic loads, it is mandatory to adopt a suitable and economically cost-efficient method to retrofit them. One appropriate method is application of steel Eccentrically Braced Frames (EBFs). This article is aimed at evaluation of seismic performance of retrofitted reinforce-concrete buildings by EBFs with single and knee links. For evaluation of modeled buildings, different editions of the Iranian Seismic Code (Standard No. 2800) were reviewed. To this end, three Moment-Resisting Frames (MRF) of four-, eight-, and twelve-story buildings with medium ductility were modeled where they were designed for seismic loads based on Standard 2800, 2nd edition. In order to evaluate buildings under modified seismic loads, models were seismically reloaded based on the Standard 2800, 3rd edition. Reanalysis showed that the stress ratios exceeded 1 in most columns. Therefore, buildings were retrofitted using EBFs with knee and single vertical links and their seismic performance were evaluated using nonlinear static analysis. Results indicate that knee bracing systems are more efficient than bracing systems with vertical link in increasing rigidity and controlling displacements, while they significantly reduce ductility. For example, application of knee bracing system in the twelve-story building can cause an 11% reduction in displacement in comparison to bracing systems with vertical links.

To cite this article

Farzad Saghafi, Ali Seyedkazemi, Hossein Mehrabian & Morteza Hosseinali Beygi, «Comparison of Seismic Behavior of Eccentrically Braced Frames with Vertical and Knee Links in Retrofitting the Reinforced-Concrete Buildings with Intermediate Moment-Resisting Frame Systems», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 85 - Année 2016, Actes de colloques, Special edition, 540 - 552 URL : https://popups.uliege.be/0037-9565/index.php?id=5468.

About: Farzad Saghafi

M.Sc. in Civil Engineering – Structure, Islamic Azad University, Ayatollah Amoli Branch, Amol, Iran, farzad.s.46@gmail.com

About: Ali Seyedkazemi

Lecturer, Department of Civil Engineering, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran

About: Hossein Mehrabian

M.Sc ,in Civil Engineering – Structure, Islamic Azad University, Islamshahr Branch, Tehran, Iran

About: Morteza Hosseinali Beygi

Assistant Professor in Civil Engineering Dept., Nooshirvani Industrial University, Babol, Iran