evaluation of progressive failure due to removal of gravity load bearing members in 15 steel floor frame

The importance of exploring the impact of blasting on different parts of the structure has become more pronounced. therefore, considering the importance of this issue, the present study investigated the progressive failure caused by gravity loader failure in ebf braced steel frames. sap2000 software was used for modeling. results: the results showed that structures designed against earthquake do not necessarily have sufficient resistance to progressive damage. according to the results of all the models studied in this thesis, 5, 10 and 15 storey buildings with dual steel bending frame and off axis bracing system are investigated for progressive failure. in the middle column removal modes in the upper floors of the structure, the performance levels of the plastic joints are within the permissible ufc regulations; in other words, in the modes of removal, no damage to the structure will occur. but removing the sidebar on the top floor without a bracket will cause damage to the structure (see bottom floor results for all models). according to this description, by changing the bracket layout in the upper floors of the middle openings and placing the brackets in side openings can reduce the chance of a crash.