Abstract

The Maule earthquake of February 27, 2010, with magnitude Mw = 8.8 is the fifth largest event that occurred worldwide, showing the vulnerability of various structures, including steel structures. Among the most used structural systems in Chile are the Special Concentrically Braced Frames (SCBF) because they can provide a great stiffness to withstand the lateral deformations produced by design earthquakes. The current Chilean seismic design standard NCh433 includes SCBF as a structural alternative, however, the seismic design of steel structures shall be designed according to the AISC 341–2005 using seismic design parameters which should be updated. The main objective of this research is to evaluate the seismic performance of SCBF models using Chevron and Two-story configurations subjected to Chilean earthquakes applying the methodology established in FEMA P695. Seismic design parameters such as ductility, overstrength and response reduction factor were quantified. The results showed that the combination of a drift limit of 0.002 rad established in NCh433, combined with the design requirements established in AISC341–22 provides high levels of overstrength. An overstrength factor of ?= 5.0 was obtained for SCBFs in comparison to the value established in ASCE 7 (?=2.5). Also, values of R-factor higher than the established of Chilean code were obtained except for low-rise archetypes, which achieved 4