Effect of postyield stiffness on the estimation of R factors for seismic design
Martinez-Rueda, J.E. (2008) Effect of postyield stiffness on the estimation of R factors for seismic design In: 7th European Conference on Structural Dynamics, EURODYN 2008, 7-9 Jul 2008, Southampton, UK.
Official URL: http://www.ndaportal.com/eurodyn-2008.html
Simplified models to estimate the seismic force reduction factor R have relied on the assumption of an elastic-perfectly plastic response of the structure. However, realistic structures exhibit a non-zero postyield stiffness that can have a significant effect on the maximum base shear the structure can experience. This paper introduces a new formula to estimate the seismic force reduction factor that accounts for the postyield stiffness of the structure. The proposed formula is based on the equal energy criterion. Comparisons between real R factors and those estimated by the proposed formula are critically discussed
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