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۱NONLINEAR BEHAVIOUR OF SUSPENDED ZIPPER BRACED FRAMES
نویسنده(ها): ،
اطلاعات انتشار: ششمین کنفرانس بین المللی زلزله شناسی و مهندسی زلزله، سال
تعداد صفحات: ۹
This study investigates efficiency of one of the lateral load resisting systems known as suspended zipper braced frame. Chevron bracing system is prone to buckling of first story compression brace while the tension member is still at its linear stage of axial behaviour when the frame is imposed with lateral load. This phenomenon produces an unbalanced vertical force imposed to the top beam leading to concentration of story drifts in one story. Zipper is a member which delivers this force to upper braces and makes them help the first story braces in resisting lateral displacement leading to distributing of drifts over the height. The problem of this system is simultaneous buckling of all compression braces. Suspended zipper frame is the same zipper frame but with strong members in the last story resulting in further ductility of the frame. In this paper the suspended zipper frame is compared with equivalent chevron braces in 3–9 and 20 story frames in terms of ductility and weight of the frame. This comparison indicates more ductility of the suspended zipper bracing system in all models and its less weight in 3 and 9 story models.<\div>

۲Comparison of Suspended Zipper Braced Frame and Chevron Braced Frame
نویسنده(ها): ،
اطلاعات انتشار: نهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۸
Chevron bracing system is prone to buckling of the first story compression brace while the tension one is still at its linear stage of axial behavior. This phenomenon produces an unbalanced vertical force imposed to the top beam leading to concentration of story drifts in one story. Zipper is a vertical member that isadded to brace to beam connections in all stories except the 1st one resulting in contribution of the bracing elements at upper stories to lateral force resistance of the structure. Also, this system leads to moreeconomical section for the 1st story compression brace member and uniform distribution of drifts over the height of the structure. Brittle response is considered as one of the main problems of this system, to avoid which the last story members are strengthened. In this study, this system, referred to as Suspended Zipper Braced Frame, is compared with Chevron bracing system in terms of ductility, economic considerations & drift ratios. For this purpose, three 3–9 and 20 story frames are analyzed using the nonlinear static analysis approach in ABAQUS6.6. The results indicate more ductility and uniform story drifts of the suspended zipper braced frames in comparison with chevron ones in three models and less steel weight for 3 and 9 story frames<\div>
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