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Abstract
The objective of the thesis is discussing the values of response modification factor (R) for ordinary reinforced concrete frames in the Egyptian Code of Practice ECP-201(2012). The studied frames were divided into 4 groups and changing some factors. Also, comparative study between the ECP-201(2012) and other codes were held. It was found that R factor increases with decreasing number of stories and the fundamental period of vibration. In addition, R factor decreases with decreasing number of bays. The listed values of R factor in the ECP-201(2012) are conservative values and can be increased