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RISS 인기검색어
- 검색키워드
- 저자 : Seyed Morteza Kazemi (검색결과 4 건)
- 무료
- 기관 내 무료
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Seyed Morteza Kazemi,Mohammad Reza Sohrabi,Hasan Haji-Kazemi 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.29 No.3
Researchers have been long studying new building implementation methods to improve the quality of construction, reduce the time of assembly, and increase productivity. One of these methods is the use of modular pre-fabricated structural forms that are composed of a beam, column, short column, pyramidal end block, and connection plates. In this study, a new geometry for the pyramidal end block was proposed that helps facilitate the assembly procedure. Since the proposed configuration affects the performance of this form of connection, its behavior was evaluated using finite element method. For this purpose, the connection was modeled in ABAQUS and then validated by comparing the outputs with experimental results. The research proceeded through analyzing 16 specimens under monotonic and cyclic loading. The results indicated that using the pyramidal end block not only makes the assembly process easier but also reduces the out-of-plane displacement of the short column webs and the vertical displacement of beam end. By choosing appropriate section properties for column and beam, the connection can bear a rotation up to 0.01 radians within its inelastic region and a total of 0.04 radians without any significant reduction in its bearing capacity.
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The effect of beam section property on the behavior of modular prefabricated steel moment connection
Seyed Morteza Kazemi,Mohammad Reza Sohrabi,Hasan Haji Kazemi 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.32 No.6
The specially prefabricated steel moment connections with pyramid head is one of the significant innovations in the steel structures forms to improve the installation time and simplify the construction procedure. The beams in this structure form are supported by two top and bottom angles and web double angles. Such a configuration despite its advantages increases the welding operation and filed installation time and costs. In this paper, the effect of using beams with channel and I section in three classes of seismically compact, seismically non-compact, and slender section according to width-to-thickness ratio on the behavior of the connection was investigated under monotonic and cyclic loading. Modeling was performed by ABAQUS and verified by the results of an experimental specimen. The findings indicated that using I and channel section instead of angle section reduces the amount of welding materials as well as easing the installation procedure. However, it has no significant effect on the ultimate strength and ductility of the connection. Furthermore, if the beam section is seismically compact, this form is considered as a special moment frame that has a rotation capacity up to 0.04 radians without any reduction in connection moment resistance.
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Design equations for prefabricated steel moment connections
Seyed Morteza Kazemi,Mohammad Reza Sohrabi,Hasan Haji Kazemi 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.80 No.3
Recently, modular prefabricated steel moment connections have been widely studied by several researchers. These connections are made of tubular columns that are ended to horizontal plates at both sides, an inter-story short column, and truss beams that are joined to the connecting plates using top and bottom plates. In this study, a series of equations have been developed and presented for designing each component of this type of connection. Then, to verify the proposed equations, the connection was modeled in ABAQUS and then the results extracted from the equations and modeling were compared. The findings indicated that the proposed equations have the required accuracy.
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Hadi Askarian,Mohammad Reza Sohrabi,Seyed Morteza Kazemi 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.80 No.4
Prefabricated steel connections are one of the innovations in the area of prefabricated steel frames that have been proposed by many researchers. In beam-to-column rigid connections, joining a beam with different angles to the column is difficult so that connecting more than four beams to the box column becomes impossible. In this study, a prefabricated steel rigid connection is proposed that allows to connect beams in a rigid form with any angle to columns using a through plate panel zone system. To this aim, several analyses were performed on the proposed connection using ABAQUS. To verify the finite element (FE) results, firstly, a prefabricated steel connection was modeled in ABAQUS and the results were then compared with the experimental model. Design formulations were also presented and validated by comparing them with finite element modeling. Afterward, the effect of different connecting angles and the number of connected beams were investigated under monotonic and cyclic loading. The results indicated that all models were able to withstand 0.04 rotation without undergoing a significant decrease in the resisting moment which demonstrates the high ductility of this connection.
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