Evaluation of Simplified Methods of Analysis for Yielding Structures
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The study presented in this report is extremely relevant to the newly suggested Nonlinear Static Analysis Procedures suggested by FEMA 273 and 274. The report addresses, to a large extent, a simplified procedure using representation of inelastic structures by elastic structures with equivalent stiffness and damping properties. As demonstrated in this study, the method is suitable in predicting the actual inelastic response with some limitations. These limitations are well quantified and characterized, and bring confidence to the good estimates obtained by the simplified method, for the cases where the limiting factors are avoided. The work in this report is relevant to the use of highly effective energy dissipation systems (or added damping systems) which produce substantial reductions of damaging deformation in inelastic systems. This is a comprehensive parametric study which extends the previous exploratory, experimental and analytical studies done by the authors and other researchers at NCEER regarding use of passive energy dissipation in inelastic structures. (Abstract adapted from text).