The Attitude of Bending Reinforced Steel Frame with Back Pulled Cable versus Advancing Failure

Document Type : Original Article

Authors

1 ihu

2 tehran university

Abstract

Considering terrorist and hostile attacks against our homeland, investigating the structure performance against explosions and the phenomenon of advancing failure is of utmost            importance. Therefore; structure hardening against explosions and the phenomenon of                  advancing destruction is one of the important issues in passive defense. This article deals with the attitude of steel structures with ordinary bending frame (SMRF) and the reinforced bending frame with back pulled cable (PTED) against advancing failure. In this regard, the alternate load path method (APM) has been used based on the DOD and GSA Directive. According to this method, the structure frame, after the elimination of the pillars of the first floor, should behave in such a manner that the first failure does not expand. Therefore; modeling is performed in the SAP2000 V15 software. To analyze the structures, non-linear static method is employed.       The non-linear static analysis results of the software regarding the three-storey structure are  compared with those of the experimental results of researchers showing a good compatibility. The performed analysis indicates that although the vertical envelope curve of the ordinary         bending frame has more resistance against advancing destruction, the performance of the               bending frame PTED performs better against big deformities caused by advancing destruction. The bending frame PTED, with the help of cables and energy dampers, prevents plastic                deformities in pillars and shores and the structure collapse, as well. Moreover, the energy in the dampers is consumed and if necessary, will be replaced.
 

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