Abstract
Recent earthquakes have revealed that, in many cases, the design codes may not guarantee the integrity of all structures for the life safety performance level. Therefore, it seems necessary to study the performance of designed buildings in order to complete, develop and amend the codes. In this paper, the performance level was investigated using the nonlinear static analysis in concrete buildings with moderate ductility and designed according to the latest regulations. Then, as the life safety performance level was not achieved and due to the ease of implementation of steel braces, the concentric chevron brace was used to improve the performance level of these buildings in large bays, and the zipper steel brace was used. The results show that the zipper brace used for strengthening the reinforced concrete structures will increase the performance as well as the stiffness, without the need to strengthen the beams and columns.
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