INVESTIGATION OF THE PROGRESSIVE COLLAPSE IN THE MIDDLE HEIGHT STEEL FRAMES SUBJECTED TO FAIL OF COLUMNS
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Abstract
Many of the available non-static loads are vulnerable to loads such as explosion load in the design of such loads and therefore their resistance to such loads should be increased. When the explosion occurs, a very rapid energy explosion is released as light, heat, sound and a wave of radiation. The damage caused by the X wave is in two cases; the direct effects of explosion and the effects of progressive collapse. Considering the above mentioned conditions, immunization. Of utilities against the effects of explosion is very important, especially in the case of structures which are in importance in position of specially. In particular, due to the occurrence of terrorist attacks in some of the most important buildings, the structure must have acceptable resistance against these loads .in this study, to investigate progressive collapse in steel structures with dampers in connection of beam to column in the first floor, the method of library studies and Abaqus software was used for modelling. The results of this research show that by creating a damper in the first - floor connection, it has a positive effect against the progressive collapse on the structure so that in some cases, offset the system by 50 percent and prevent further destruction
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