| A reinforced concrete frame with rocking spine system is evaluated using reliability-index method with main objective of establishing the load and resistance factors for the force-controlled components. A nonlinear structural model of a six-bay six-story concrete frame building with stiff infill panels idealized as compression only struts was constructed in OpenSees. Spine-infills, spine-beams, and spine-columns, are considered as force-controlled components, while non-spine infills and adjacent beams are considered as deformation-controlled components. The model is evaluated with 44 ground motions through Incremental Dynamic Analysis (IDA) to determine the demands in the force-controlled components. The model was also evaluated through response spectrum analysis to define the system's yield modification factor, Rmu, which is used along with hazard curve to obtain the reliability index of the system, beta R,Halpha. The capacity,,and demand,factors are calculated by defining the probability of demand surpassing capacity in 50 years equal to 0.05%, 0.1%, 0.2%, 0.5%, and 1%. The results show that the &phis;/gamma decreases as Rmu and betaR,Halpha increases. The capacity and demand factors of spine-infill struts, spine-beams, and spine-columns for 0.1% P(D>C) 50 years are: gamma = 1.0, &phis; = 0.2; gamma = 1.0, &phis; = 1.0; respectively. |
