Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2009.1065.1073FallahA.A.MoghadamA.S.MassumiA.6200996In almost all codes of practice for seismic resistant
design of buildings, a behavior factor is used to reduce design base shear.
The behavior factor is affected by several parameters such as ductility,
overstrength and redundancy reduction factors. There are two common approaches
to assess the effects of redundancy on the strength of a structural system,
which are as follows: static pushover analysis and incremental dynamic
analysis. The two indices: redundancy strength coefficient and redundancy
variation coefficient have been introduced to measure these effects. Simplified
methods are developed and presented to calculate these parameters. In
this study, the redundancy strength and the redundancy variation parameters
are evaluated for the reinforced concrete plane frames with different
number of stories, bays and ductility capacities. The investigations indicate
that these two parameters are mainly the results of redundancy reduction
factors.]]>ATC, 1995Bertero, R.D. and V. Bertero, 1999Husain, M. and P. Tsopelas, 2004Husain, M. and P. Tsoplas, 2004Pandey, P.C. and S.V. Barai,1997Park, Y.J. and A.H.S. Ang, 1985Wen, Y.K. and S.H. Song, 2003Uang, C.M., 1991R (or R_{w}) and C_{d} factors for building seismic provisions.]]>