A numerical investigation of the influence of semi-rigid composite connections on the seismic behavior of a building with steel concentrically braced frames
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Tarih
2019
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Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Semi-rigid composite connections are connections which have a certain rotational stiffness andbending strength by means of the slab and its reinforcement. The use of these connections canlead to economic and structurally efficient solutions such as selecting smaller beam sections,reducing deflection and vibration problems. Additionally, they are permitted to use as asecondary lateral resisting system in regions of high seismicity. Therefore, in this study, twoinvestigations were made in terms of seismic behavior evaluation: the influence of semi-rigidcomposite beam-column connections on interior frames and the influence of shear tabconnections. Firstly, a 6-story building with steel special concentrically braced frames isdesigned according to current seismic design codes. Secondly, 3 models are created using thedesigned building. In Model 1, all beam-column shear tab connections are assumed as pinnedconnections. Model 2 and Model 1 are identical except that In Model 2, shear tab connectionsused in Model 1 are not assumed as pinned connections and their actual behavior is determinedand included to the model. In Model 3, all beam-column connections on the interior frames aredesigned as semi-rigid composite connections. The interior frame sections are reselected andthe exterior beam-column connections except for the ones on the braced bays are assumed thesame as in Model 2. Lastly, nonlinear static analysis (pushover) is carried out and somecomparisons are made with respect to the following aspects: lateral displacement and storydrifts under same lateral force and lateral force under the same lateral displacement. As a result,Model 1 and Model 2 showed similar behavior due to the shear tab connections acting almostas pinned while Model 3 showed that using semi-rigid composite connections can increase thebase shear capacity by %48 and decrease peak displacements and story drifts by %65.
Açıklama
Anahtar Kelimeler
Kaynak
Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi
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Cilt
23
Sayı
6
