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http://dx.doi.org/10.5000/EESK.2002.6.4.065

The Properties of a Nonlinear Direct Spectrum Method for Estimating the Seismic Performance  

강병두 (거창전문대학 건축과)
김재웅 (동아대학교 건축학부)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.6, no.4, 2002 , pp. 65-73 More about this Journal
Abstract
It has been recognized that the damage control must become a more explicit design consideration. In an effort to develop design methods based on performance it is clear that the evaluation of the nonlinear response is required. The methods available to the design engineer today are nonlinear time history analyses, monotonic static nonlinear analyses, or equivalent static analyses with simulated nonlinear influences. Some building codes propose the capacity spectrum method based on the nonlinear static analysis(pushover analysis) to determine the earthquake-induced demand given by the structure pushover curve. These procedures are conceptually simple but iterative and time consuming with some errors. This paper presents a nonlinear direct spectrum method(NDSM) to evaluate seismic performance of structures, without iterative computations, given by the structural initial elastic period and yield strength from the pushover analysis, especially for MDF(multi degree of freedom) systems. The purpose of this paper is to investigate the accuracy and confidence of this method from a point of view of various earthquakes and unloading stiffness degradation parameters. The conclusions of this study are as follows; 1) NDSM is considered as practical method because the peak deformations of nonlinear system of MDF by NDSM are almost equal to the results of nonlinear time history analysis(NTHA) for various ground motions. 2) When the results of NDSM are compared with those of NTHA. mean of errors is the smallest in case of post-yielding stiffness factor 0.1, static force by MAD(modal adaptive distribution) and unloading stiffness degradation factor 0.2~0.3.
Keywords
nonlinear direct spectrum method; capacity spectrum method; pushover analysis; nonlinear lime history analysis; unloading stiffness degradation factor; ductility ratio; error;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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