Behavior of steel frames with rotational friction dampers by endurance time method

• Using the endurance time method instead of the large number of nonlinear time history analyses to obtain the optimum slip force of the rotational friction damper is possible too.
• Maximum interstory drift ratio is one of the interesting engineering demand parameters in endurance time method.
• Investigation into the influence of the rotational friction damper on the performance of steel frames with the endurance time curves is possible.
• By adding the rotational friction dampers to the underdesigned steel frames, their performance will be improved properly.

Additional dampers are employed in order to decrease the dynamic response of structure against the earthquake and wind loading recently. Rotational friction damper (RFD) is one of them used in present study. The endurance time (ET) method is a new time-history-based dynamic pushover procedure in which structures are subjected to a gradually intensifying acceleration functions and their performance is judged based on the length of the time interval that they can satisfy required performance objectives. In this study, the application of ET method in nonlinear seismic analysis of steel frames equipped with the RFDs has been investigated. This method is used to calculate the optimum slip force of the RFD. The accuracy of ET method in predicting the response of structures in nonlinear analysis is investigated. Engineering demand parameters (EDPs) of frames with and without the RFDs such as displacement and maximum interstory drift ratio is estimated. Using ET curves, it is identified that the installation of the RFDs in underdesigned steel frames will decreases the maximum interstory drift ratio and will improves the seismic performance of such frames.

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