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RC moment-resisting frames (RCMRFs) have commonly been used for low-to-moderate rise buildings in seismic prone regions. RCMRFs can perform well when they are subjected to strong earthquake ground motions if they are properly designed and detailed to dissipate the seismic input energy through deformations in inelastic range. The connections between beams and columns thus become critical components to the performance of these structures. In conventional RCMRF connections, the width of the beam does not exceed the width of the column. Adopting a flat beam system for the design scheme provides many advantages, such as the reducing the amount of formwork required, the simplicity for repetition, and the decrease of the required story height. RCMRFs with flat beams have been used extensively, despite the lack of sufficient information on how this system behaves under earthquake loading which leads the codes to restrict the use of flat beamcolumn connections in earthquake prone regions.
The Steel/RC composite Column-beam connection joint is considered one of the most important subjects in framed construction. Ductility has the most influence among other factors that control the behavior of this joint, and the nonlinear behavior of this joints when subjected to large and cyclic loading is dominated by several parameters. These parameters reflect the assembled components of the joint for every component has a distinguished material and therefore specific behavior under the loading corresponding to it.
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