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      저자 : Seyedbabak Momenzadeh (검색결과 2 건)
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      • KCI등재

        Seismic Performance of Reduced Web Section Moment Connections

        Seyedbabak Momenzadeh,Mohammad Taghi Kazemi,Masoud Hoseinzadeh Asl 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.2

        Seismic behavior of beam-to-column connections can be improved by shifting the location of inelasticity away from the column’s face. Such connections can be achieved by reducing the flange area at a specific distance from the beam-column connection, called reduced beam section (RBS), or by reducing web area by introducing a perforation into the web, called reduced web section (RWS). This paper presents a parametric study that is carried out on the effect of the perforation size, perforation location, and the beam span length in the RWS connections, using finite element modeling. Next, an interaction formula is derived for design purposes, and a step by step design method is developed. Finally, a frame is analyzed to verify the reliability of the proposed design process and assess the impact of the RWS connections on the behavior of special moment frames. The study concludes that RWS connections can effectively improve seismic performance of special moment frames, causing plastic hinges to form around the perforation away from the column’s face.

      • KCI등재

        Evaluation of Friction Strength Loss in Endplate Moment Connections with Skewed Beam

        Masoud Hoseinzadeh Asl,Mahsa Saeidzadeh,Seyedbabak Momenzadeh 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.6

        This paper investigates the behaviour of skewed beam to column connections with endplates. The skewed moment connection results in torsional moment at the column face. The torsional moment causes to additional shear stress at the end plate surface, which will be combined with the shear stress due to the connection shear force. Since the endplate moment connection is a friction bolted connection, the increased shear stress at the connection face can lead to the frictional force loss and possible slippage of the end plate. In order to study the eff ect of skewed beam to column endplate connection on the ratio of friction force of the connection, 132 non-linear fi nite element models of beams with 10°, 20°, 30° and 45° of deviation are investigated. The results show that the beams with deviation angle of 45° have considerable loss in frictional force at the end plate. For the smaller deviation angles, adding one or two rows of bolts is an eff ective method to reduce the frictional force loss of the skewed beams with small deviation.

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