الفهرس Only 14 pages are availabe for public view
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Abstract
This study investigates the effects of boundary conditions as 2support type of column and direction of strong axis of column3 on the response modification factor 2R-factor3 for steel frames. Besides, other parameters as number of bays, story number and position of bracing. All steel frames are designed according to Egyptian Code. Based on the results, for each different boundary condition there is different R value, that{u2019}s mean, the R-factor is unique for each steel frame and depended on stiffness of the frame system; R-factor increases when fundamental period is decreased and braced frames have value smaller than un-braced frames. Types of support of column have high effect on fundamental period for un-braced frames and less for braced frames. Direction of column has effect on R-factor for both types of frames. Egyptian Code gives limited R-value for steel frames comparing to this study. The minimum value of R-factor for each frame in this study is close to the value in the Code, which means the Code is more conservative