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RISS 인기검색어
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- 저자 : Nima Talebian (검색결과 3 건)
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Mohammad H. Habashizadeh,Nima Talebian,Dane Miller,Martin Skitmore,Hassan Karampour 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.49 No.1
Due to their efficient use of materials, hybrid reinforced concrete-steel (RCS) systems provide more practical and economic advantages than traditional steel and concrete moment frames. This study evaluated the seismic design factors and response modification factor ‘R’ of RCS composite moment frames composed of reinforced concrete (RC) columns and steel (S) beams. The current International Building Code (IBC) and ASCE/SEI 7-05 classify RCS systems as special moment frames and provide an R factor of 8 for these systems. In this study, seismic design parameters were initially quantified for this structural system using an R factor of 8 based on the global methodology provided in FEMA P695. For analyses, multi-story (3, 5, 10, and 15) and multi-span (3 and 5) archetypes were used to conduct nonlinear static pushover analysis and incremental dynamic analysis (IDA) under near-field and far-field ground motions. The analyses were performed using the OpenSees software. The procedure was reiterated with a larger R factor of 9. Results of the performance evaluation of the investigated archetypes demonstrated that an R factor of 9 achieved the safety margin against collapse outlined by FEMA P695 and can be used for the design of RCS systems.
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Seismic Performance of Composite RCS Special Moment Frames
Bahman Farahmand Azar,Hosein Ghaffarzadeh,Nima Talebian 대한토목학회 2013 KSCE Journal of Civil Engineering Vol.17 No.2
Composite Reinforced Concrete-Steel (RCS) frames which consist of Reinforced Concrete (RC) columns and Steel (S) beams were represented to combine the advantages of pure RC and steel frames. This system permits the primary steel beam to run continuous through the reinforced concrete column. This paper evaluates seismic performance of RCS frames based on FEMA-356,considering plastic rotations as acceptance criteria. The effect of joint deformations on overall behavior of RCS frames is studied through nonlinear static analysis (Pushover) that is performed in OpenSees software. It is concluded that the RCS joint behavior increases lateral load capacity of frame. Additionally, 3 RC frames are compared to RCS frames with columns similar to those of RC frames. The results show a great improvement on overall behavior since steel beams is used instead of RC beams.
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Numerical Evaluation of Failure Mechanisms and Retrofitting of Connections in Mass Timber Buildings
Mahyar Masaeli,Hassan Karampour,Benoit P. Gilbert,Hong Guan,Arash Behnia,Nima Talebian 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.7
With the growing trend in industry towards zero carbon construction, mass timber structuresare becoming more accepted globally. Beam-to-column connections in mass timber buildingsare currently designed to carry shear actions. However, the connections may be considered totake moment actions and large rotations to comply with ductility and robustness requirementsof the building standards. The current study deploys finite element analysis (FEA) to investigatethe failure due to large deformation and rotation of a typical bolted beam-to-columnconnection and provides an economic retrofitting design solution using self-tapping screws(STS). The FEA is validated against current or published experimental results and is used toconduct a thorough assessment of the retrofitted connection. It is shown that a properarrangement of screws can delay the brittle failure, develop significant moment-resistingcapacity, and enhance the rotational ductility of the connection.
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