توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Performance–based plastic design method For steel concentric braced frames
نویسنده(ها): ، ،
اطلاعات انتشار: هشتمین کنگره ملی مهندسی عمران، سال
تعداد صفحات: ۸
This paper presents a performance–based plastic design (PBPD) methodology for the design of steel concentric braced frames (CBF). The design base shear is obtained based on energy–work balance equation using pre–selected target drift and yield mechanism. In order to achieve the intended yield mechanism and behavior, plastic design is performed todetail the frame members. Three low–to–medium rise CBF (3–story, 6–story and 9–story) were designed by the proposedmethodology and current seismic codes that include provisions to design ductile concentric braced frames called specialconcentric braced frames (SCBF). Results of inelastic dynamic analyses carried out on example frames designed by thePBPD method showed that the frames met all the intended performance objectives in terms of yield mechanisms and target drift levels. On the other hand, when designed by current code as SCBF the same structures showed very poor response due to premature brace fractures leading to unacceptably large drifts and instability. Finally it should be noted that no iterations were carried out to achieve the performance objectives of CBF in the PBPD method.<\div>

۲The R–Factor for dual moment frame with buckling – resistant brace (BRB) and ordinary brace
اطلاعات انتشار: هشتمین کنگره ملی مهندسی عمران، سال
تعداد صفحات: ۸
Response modification factor (R–Factor) is a seismic design parameter to assess nonlinear performance of structures during strong ground motion. Regarding this, many seismic design codes lead to reduce earthquake loads. The present paper attempts to evaluate R–Factor of dual moment resistant frame withordinary braces (CBFs) and buckling resistant braces (BRBs). Since R–Factor depends on ductility and overstrength, static nonlinear analysis and nonlinear incremental dynamic analyses (IDA) are performed on building models with different stories and braces (diagonal, invert V, split X). The results show that RFactorsof BRBs are higher than the values of (CBFs) in all of the models. It has also been mentioned thatthe ductility and R–Factors of the frames decrease in all models while the height of structures increases. Finally, it has been found that the types of bracing systems have the significant effects on R–Factors<\div>
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