Height Effect on Response Modification Factor of Open Chevron Eccentrically Braced Frames

The necessity of making buildings taller and height of new buildings is now one of the major problems in building design and codes of interest is located. with height, the need for further ductility and the capability of energy dissipation can be a significant role in the proper and safe design of structures to play. it seems that changes the height of buildings can be treated directly on the response modification factor of structures and thus the seismic performance of structures under severe earthquake to be effective. this research is an attempt to evaluate the ductility, over-strength and response modification factors of the open chevron eccentrically braced frames (ebfs) with 5, 10, 15 and 20 stories under tabas, naghan, bam and el- centro strong ground motions. these frames were analyzed by using static pushover analysis, linear dynamic and incremental nonlinear dynamic analysis and the values of these factors for different models have been determined separately and it is resulted that with increasing the height of buildings, the ductility reduction factor and the response modification factor of ebfs, decrease, but this variation hasn’t any influence on the over strength reduction factor.