چكيده به لاتين
Buckling restrained braces are one of the structural systems that, although capable of exhibiting a high non-linear behavior with high energy absorption, can be exposed to severe earthquakes due to the difficulty after submergence. Large deformations and even general instability. This is exacerbated by irregular structures where demand in a region is concentrated. Recently, a constructive fuse named CSY submissive fuse has been proposed by researchers, which, having a gradient after yielding, could fix the buckling problem. In this study, to evaluate the system's efficiency in irregular structures, this system was compared with a buckling restrained brace frame, which is a common fuse. To do this, twelve regular and irregularly frames, with a number of floors of four, eight, and twelve, were equipped with buckling restrained brace and CSY fuses with similar elastic stiffness and similar yielding points. After incremental dynamic analysis, structural fragility curves in different functional levels based on two engineering requirements, the maximum inter story drift ratio and the maximum residual inter story drift ratio have been generated and evaluated. The results showed that at the level of performance with low engineering requirements, the performance of the two systems is the same, but with increasing demand for engineering, the CSY fuse performs better than buckling restrained braces. Also, if the structure is short, with the irregular occurrence in the lower stories, the difference in performance of the two systems is greater, but in the structures with a moderate to high irregular height in the higher stories, this difference will be more productive. It was also observed that the CSY fuse has a much better performance than buckling restrained braces in reducing residual inter story drift ratio of these structures.
