In recent years, dynamic analysis has been considered as an appropriate tool in the earthquake engineering field. On the other hand, the number of analyzes required in the research and design field has grown. So, in some fields of research with a probabilistic approach, resilience or optimization, requires extensive nonlinear dynamic analyses. Performing such a mass analysis has a very high computational cost and requires a lot of analysis time. One of the practical solutions to this problem is the use of simplified models that significantly reduce the total analysis time with appropriate and acceptable accuracy compared to the detailed model. In this research, in order to determine the collapse margin ratio of structures, three 8-,12-, and 20- story buildings have been considered. By performing the incremental dynamic analysis (IDA) on the detailed model and the substitute frame model, their collapse intensities and collapse margin ratio have been calculated. The results show that the substitute frame model determines the collapse margin ratio with an error rate of 3%, and also reduces the analysis time by an average of 2/5%.