توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱The Application of U–Shaped Metallic Yielding Dampers in Retrofitting of Steel Frames
اطلاعات انتشار: دومین کنفرانس بین المللی ژئوتکنیک و مهندسی لرزه ای شهری، سال
تعداد صفحات: ۱۳
The reduction of structural response under dynamic loads has cut serious attentions in recent decades. Steel yielding dampers are used as a devise to control the structural response under wind and quake loads. In this paper, three steel moment frame in 3, 5 and 8stories are analyzing in a nonlinear time history under four different motions. With respect to failure of elements, U–shaped steel yielding dampers have been added by knee braces of the structures. In this paper, in addition to defining nonlinearity of damper, nonlinear specification of beams and columns by assigning plastic hinges on this elements have been considered. The results show transferring nonlinearity of elements to the damper and the failure of the frame will reduce. Dampers will develop frame behavior and reduced lateral displacement and story shear. Also they increase energy dissipation of frame<\div>

۲The Comparison of Seismic Retrofitting in Ordinary Steel Moment Resistant Frames with two CBF and ADAS Systems
اطلاعات انتشار: دومین کنفرانس بین المللی ژئوتکنیک و مهندسی لرزه ای شهری، سال
تعداد صفحات: ۱۵
In this study, the nonlinear seismic behavior of typical Iranian buildings is evaluated. Samples include simple steel building frames and ordinary moment resistant steel as well as concrete frames. The effectiveness of two retrofit schemes is compared:– Concentric steel braces (CBF)– Added Damping and Stiffness steel plate energy dissipaters (ADAS)In this investigation, mechanical characteristics of ADAS elements, studied using a nonlinear analysis program and for performance based evaluation of structures, nonlinear static pushover analysis conducted using ATC–40 capacity spectrum method. The results indicated that, although CBF retrofit scheme is efficient in stiffness increases and lateral displacement reduction, but increases the internal forces of some structural elements. Due to limit capacity of elements, this scheme doesn’t satisfy the retrofit objectives. The ADAS dissipater, in contradiction of CBF system, doesn’t produce significant increases structural seismic forces. Retrofitted structures with ADAS are able to sustain earthquakes, which are stronger than design earthquake.<\div>
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