In this study, behavior of two reinforced concrete buildings, which have been designed in accordance to national building codes such as ABA and 2800 have been evaluated under surface blast loading. Then, the two buildings are modeled in 3D dimensions by Abaqus/Explicit software. The buildings under investigation include 4-storey and 8-storey moment resistant frames. These two buildings are analyzed under surface blast loading and seismic loading. Then, structural responses such as base shear and base moment are compared with each other. Obtained results showed that blast loading has much higher effects than earthquake on the frames, although blast time period is much less than earthquake one. Ultimately, if a seismic resistant structure wants to be designed under blast loads, it will be necessary to analyze and assess the structure again to reach a safe level

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