Quantification of seismic performance factors for self-centering controlled rocking special concentrically braced frame

Modern self-centering controlled rocking special concentrically braced frame (SC-CR SCBF) is capable of reducing structural damage compared with conventional buildings following an earthquake. This investigation quantifies three seismic performance factors, including over-strength factor (Omega(0)), period-based ductility (mu(T)) and response modification coefficient (R), for low-and mid-rise SC-CR SCBFs. Nonlinear static analysis is conducted to derive Omega(0) and mu(T) factors for 12 SC-CR archetypes. Validity of trial R coefficient is also evaluated using a collapse-based assessment procedure by comparing adjusted collapse margin ratios with the established acceptance criteria. Results indicate that the Omega(0) and mu(T) factors are in the range of 1.39 to 2.29 and 12.25 to 29.0, respectively, and R of 8 is proposed for design of SC-CR archetypes. A reliability study is also performed to examine the effects of modeling and ground motion parameters on the safety margin of designed SC-CR archetypes with the proposed R value. Results indicate that the design of mid-rise space archetypes in high-seismicity regions with the R coefficient of 8 is more reliable than that of the low-rise perimeter ones in low-seismicity regions. Copyright (C) 2016 John Wiley & Sons, Ltd.