Strength Reduction Factors in Performance

Jun 21st, 2015
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Strength reduction factors that are used to reduce design forces in earthquake resistant design are discussed. Based on recent research, the paper presents the different components of the so called R factors and discusses how these can be incorporated.

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niseeNational Information Service for Earthquake EngineeringUniversity of California, BerkeleyStrength Reduction Factors in Performance-Based DesignBy Eduardo MirandaNational Center for Disaster Prevention (CENAPRED)A.V. Delfin Madrigal 665, 04360 Mexico, D.F., MexicoNote: this paper was presented at the EERC-CUREe Symposium in Honor of Vitelmo V. Bertero, January 31 - February 1, 1997, Berkeley, California.SUMMARYStrength reduction factors that are used to reduce design forces in earthquake resistant design are discussed. Based on recent research, the paper presents the different components of the so called R factors and discusses how these can be incorporated into a performance-based earthquake resistant design. The first component discussed is the reduction in lateral strength demand produced by nonlinear behavior in the structure which takes into account the hysteretic energy dissipation capacity of the structure. The paper presents first a summary and comparison of recent statistical studies on strength reduction factors computed for single-degree-of-freedom systems undergoing different levels of inelastic deformation when subjected to a large number of recorded earthquake ground motions. Despite having used significantly different ground motions data bases, results from various studies are remarkably similar. The main parameters that affect the amplitude of strength reductions are discussed. The evaluation of the results indicates that strength reduct

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