توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Assessment of seismic behavior of RC buildings retrofitted with steel knee bracing based on non–linear dynamic analysis
اطلاعات انتشار: نهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۷
In this study, the seismic reliability of a short–rise reinforced concrete (RC) building retrofitted using knee steel braces is investigated through non–linear dynamic analysis. As a case study, a three storyRC building was selected. The design of selected sample building was made with reference to Iran seismic resistant design of building–code of practice 2800. The effectiveness of using knee braces in retrofitting buildings was examined. The effect of distributing the steel braces over the height of theRC frame on the seismic performance of retrofitted building was studied. For the strengthening of the original structure knee bracing frame (KBF) was applied with four different spatial distribution in the structure. The improvement of seismic reliability achieved through the use of knee braces wasevaluated by comparing the displacement of stories. As a result of this study, the improvement in seismic performance of this type of short–rise RC building resulting from retrofits by steel knee braces was obtained by stories displacement diagrams.<\div>

۲Assessment of seismic behavior of buildings retrofitted with self–centering dampers based on non–linear dynamic analysis
اطلاعات انتشار: نهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۷
In traditional methods of seismic design, structures have been designed on the basis that members remain elastic under weak earthquake while they exceed elastic zone under severe earthquakes, but the method of the modern design criteria, structure performance (i.e. displacement,…) has been defined as the basis of design instead of using member forces. In other words performance design has been replaced strength design. Self–centering dampers (SCd) are such dampers which show no residual deformation. They are capable of recovering their original shapes after the removal of external forces. These dampers represent moderate energy dissipating capacity and consist of re–centering components group and an energy dissipating components group. Residual drift is an important index for structure's damages so using these dampers (that vanish residual drift) decrease damage of structures. In this research the impact of self–centering devices on seismic performance of steel frames has investigated. For this purpose a five story building has modeled in OpenSees software with and without self–centering device, each structure has analyzed using nonlinear time history analysis with considering 3 earthquake records.Results show that SCd would eliminates residual drift as well as decreasing in maximum drift of each story. So we could conclude that SCd increase the structure's performance.<\div>

۳Assessment of seismic behavior of steel structure retrofitted with TADAS device based on non–linear dynamic analysis–
اطلاعات انتشار: نهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۸
The TADAS device is in the metallic yielding dampers class and because of its extraordinary flexibility,increases damping of structure and caused to control of response and decreasing seismic need of structure.This device which consists triangular structural steel plates positioned in parallel, is typically installed within a frame bay between a chevron brace and overlaying beam .In this research is trying to investigate the impact of TADAS devices on seismic performance of steel structure. For this purpose different modelsof structure were built in OpenSees software. And finally, with the help of this software non linear dynamic analysis were performed for every one of structures; and with replies study the performance of this device has been assessed.<\div>
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