Dariush Alimohammadi - M.Sc. Graduate, Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
Esmaeel Izadi Zaman Abadi - Assistant Professor, Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

In this study, the effect of using two seismic design methodologies, Direct Displacement-Based Design (DDBD) and traditional Force-Based Design (FBD), on the probabilistic seismic performance of an ۸-story RC moment resistant building is investigated. Also, two probabilistic procedures are applied for considering aleatory and epistemic uncertainties. Thus, this research is conducted by studying (i) non-linear static curve (ii) incremental dynamic analysis curve (iii) the Mean Annual Frequency (MAF) (iv) seismic demand of limit states (v) the confidence level of structures under the earthquakes with low to high hazard levels. Based on the comparing two mentioned seismic design methods, it can be said that the structure designed with FBD, unlike DDBD methodology is not capable of estimating performance goals. Also, it is concluded that the structure under both aleatory and epistemic uncertainties behaves more vulnerable and MAF of exceeding the immediate occupancy and collapse prevention is increased.

Direct Displacement Based Design, RC frame, Nonlinear Analysis, Probabilistic evaluation, Confidence level