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Development of Eccentrically Interconnected Braced Frame (EIC-BF) for seismic regions Morteza Bastamia,⁎, Roohollah Ahmady Jazanyb a Structural Engineering Research Center, International Institute of earthquake Engineering and Seismology (IIEES), No.192 Arghavan St. North Dibaji, Farmaniyeh, Tehran Province, Tehran, Iran b Department of Civil Engineering, East Tehran Branch, Islamic Azad University (IAU), Ghiamdasht, Emam Reza Blvd, Afsariye, Tehran, Iran A B S T R A C T This study aims to develop an Eccentrically Braced Frame (EBF) system, which is so called Eccentrically Interconnected Braced Frame (EIC-BF), by proposing an innovative Structural Fuse (SF) using a very thin midheight gusset plates with specified details for seismic regions. In the proposed structural system, as a low damage or repairable system, the mid-height gusset plate, as a replaceable centric shear link that connects four eccentric brace segments, behaves as a SF so concentrates most of large deformation and stress demand and dissipates the large amount of energy imposed by lateral loading. In order to investigate the effect of the proposed SF with the specified details, i.e. mid-height gusset plates with proposed details, on the seismic behavior of EIC-BF, nine three-fourth scale cyclic experiments were conducted. This research describes the results of the experiments elaborately and evaluates the cyclic responses of the studied EIC-BFs with respect to their utilized details. The results show that establishing the specified details and design parameters including eccentricity value of braces at mid-height gusset plate, mid-height gusset plate thickness and the stiffener configuration at mid-height gusset plate improves the seismic performance of EIC-BF in term of story drift angle by up to 32% as well as reduces the considerable pinching in cyclic response; while prevents main structural elements including beam, columns and braces from undergoing inelastic behavior. Keywords: Eccentrically Braced Frame (EBF) Mid-height gusset plate Corner gusset plate Structural Fuse (SF) Out-of-plane buckling Dissipated energy منبع دانلود از پیوست Development_of_Eccentrically_Interconnected.pdf

Direct Displacement-Based Seismic Design of Eccentrically Braced Steel Frames Gerard J. O’Reilly & Timothy J. Sullivan Abstract A series of eccentrically braced frames (EBF) are designed and subjected to nonlinear analyses to highlight ambiguities and differences in current seismic design provisions for EBF structures. This provides motivation to implement better guidance for the checking of local displacement demand considerations and move towards a displacement-based design approach. A recently proposed direct displacement-based design (DDBD) procedure for EBFs is then described and further developed in this paper through the calibration of a spectral displacement reduction factors that relate the displacement of an inelastically responding structure to that of the equivalent linear representation used in the DDBD of EBFs. Such an expression is calibrated as part of this study using an experimentally validated numerical model also proposed here for the EBF links such that the actual hysteretic behaviour of the links is well represented. The DDBD guidelines are applied to EBF systems from 1 to 15 storeys in height and their performance is verified via nonlinear dynamic analyses using two different sets of design spectrum compatible ground motions. The results of the study indicate the robustness of the proposed DDBD method in limiting the interstorey drifts to design limits for a variety of EBF systems with short links, thus demonstrating that the proposed DDBD method is an effective tool for seismic design of EBFs. TandF_1485618928.rar

بررسی آزمایشگاهی بهبود رفتار لرزه‌ای پیوندهای ساخته شده از مقطع لانه زنبوری در قاب با مهاربندی برون محور مجله علمی، پژوهشی: نشریه علمی و پژوهشی سازه و فولاد-شماره‌ي شانزدهم -پائیز و زمستان 1393 نویسنده: علیرضا رضائیان ، امین جاهدی دلیوند دانلود art-950310716.pdf