| Summary: | 碩士 === 國立高雄第一科技大學 === 營建工程研究所 === 100 === The study used the program ETABS and the auxiliary programs from National Center for Research on Earthquake Engineering to do pushover analysis. Such analysis is needed in the evaluation for seismic capacity of building frames according to the Capacity Spectrum Method of ATC-40 manual. We proceeded with two past case studies on seismic evaluation of low-rise school buildings, made comparisons between this study and the original reports, and brought up schemes to improve the pushover analysis. In the process, we found out that excessive torsion took place for Y-direction pushover, as indicated by a rebounding/snapping in the load-deflection response; beside that, the equivalent strut modeling for brick sills affects the ultimate displacement for X-direction pushover.
Through the analysis of actual cases, we advised that seismic evaluation and retrofitting should consider the weakest locations of an entire building frame following the initial pushover analysis, e.g. around the masonry openings for high windows, and then eliminate them in advance to avoid a premature ending in pushover analysis. Next, utilizing the built-in accidental eccentricity in ETABS program can effectively reduce torsions and provide rational pushover results. In all, the strut models for brick sills shall account for a conservative approach during the analysis.
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