To estimate amount of damage to structure subjected to an earthquake, various damage indices have been developed in recent years. Results of dynamic analysis are usually used to evaluate damage to structure in these indices. The objective of this study is to develop a new method to evaluate damage to steel structures based on the results of pushover analysis. For this purpose, several steel moment resisting frames are considered and inelastic damage analysis is performed on them subjected to various earthquake records. Then nonlinear static analysis (pushover analysis) is performed on all the frames and performance points are determined using the capacity spectrum method. By having the performance points, the static damages are computed at these points. By evaluation correlation between the damage index in nonlinear dynamic analysis and the damage indices in pushover analysis, some equations are present to estimate the damage to structure based on pushover results. In order to present an effective procedure in determining the structural damage by using proposed criterion, a table is presented.