Investigation of collapse-resisting capacity of braced steel moment frames

In this paper,the probability of the occurrence of progressive collapse in three-story,six-story and nine-story steel buildings is evaluated. these three structures are designed based on common codes. according to the obtained results,it can be observed that the six-story and nine-story buildings cannot fulfill the acceptance criteria of ufc4-023-03 guideline. to enhance the collapse-resisting capacity of these buildings,steel braces are deployed. by performing non-linear static and dynamic analysis,it is induced that the presented retrofitting methods decrease the probability of the occurrence of progressive collapse. in addition,the displacements of the structures with a removed column are considerably reduced. in other words,the aforesaid buildings are able to satisfy the acceptance criteria of ufc guideline by utilizing the suggested retrofitting method. © 2017 just. all rights reserved.