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Today, the evaluation of the performance of structures against earthquakes has become one of the common issues among researchers. Damage to structures caused by earthquakes in the past raises the need to assess the likelihood of failure in future earthquakes.
One of the key tools in evaluating seismic damage of structures is fragility curves, which is a useful and efficient tool. The fragility curves indicate the probability of a failure or failure of the structure to a certain degree of degradation versus the severity of the earthquake.
The purpose of this study was to develop the flexural curvatures of special folding frame structures in accordance with the 2800 regulations and to compare the results of the third and fourth editions of the 2800 regulations.
To this end, two steel structures with a special bending frame with a number of floors 6 and 9 in Tehran were designed with two different designs, the first one being modeled according to the 2800 third edition of the Regulation, and in the latter case, it was designed according to the fourth edition of the 2800 Code. . Subsequently, by analyzing the dynamic nonlinear time histories (IDA), these frames were evaluated under 37 accelerations, and finally, by obtaining capacities for four models, these capacities were used to obtain fragility curves and compare their results with use Has been.