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http://dx.doi.org/10.5000/EESK.2009.13.2.059

Secant Stiffness for Direct Inelastic Earthquake Design of Reinforced Concrete Structures  

Eom, Tae-Sung (대구가톨릭대학교 건축학과)
Kim, Jae-Yo (광운대학교 건축공학과)
Park, Hong-Gun (서울대학교 건축학과)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.13, no.2, 2009 , pp. 59-68 More about this Journal
Abstract
For safe and economical design to provide strong earthquake resistance, the moment redistribution and plastic rotation of structures and their members needs to be evaluated. To achieve this, an earthquake design method was developed using secant stiffness analysis. To address the variation of member stiffness due to plastic rotation and moment redistribution, a structure was modeled with a beam-column element with non-rigid end connections (NREC element). Secant stiffness for the NREC element was determined based on the ductility demands of the structure and members. By performing a conventional linear analysis for the secant stiffness model, redistributed moments and plastic rotations of the members were computed. The proposed method was applied to a moment frame and two dual systems. The design results were verified using detailed nonlinear analyses.
Keywords
secant stiffness analysis; inelastic analysis; moment redistribution; seismic design; reinforced concrete;
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