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Experimental and numerical evaluation of rigid connection with reduced depth section
Allah Reza Moradi Garoosi,Mehrzad Tahamouli Roudsari,Behrokh Hosseini Hashemi 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.34 No.6
After medium or strong earthquakes, damage in the reduced portion of RBS connections occurs due to plastic deformations. The purpose of this paper is to numerically and experimentally investigate the reduced depth section connection as a replaceable fuse. In this regard, three commonly used rigid connections with RBS, a replaceable fuse with RBS, and a replaceable fuse with Reduced Depth Section (RDS-F) were evaluated. All specimens were subjected to quasi-static cyclic load until failure. Although the final strength of the RDS-F is lower than that of the other two, laboratory results showed that it had the maximum ductility among the three samples. The numerical models of all three laboratory samples were constructed in ABAQUS, and the results were verified with great accuracy. The results of more than 28 numerical analyses showed that the RDS-F sample is more ductile than the other specimens. Moreover, the thickness of the web and the plastic section modulus increasing, the final strength would be equal to the other specimens. Therefore, the modified RDS-F with replaceability after an earthquake can be a better alternative for RBS connections.
Introducing new rigid I-beam to box column connections by using a stiffened channel link
Allah Reza Moradi Garoosi,Mehrzad Tahamouli Roudsari,Morteza Torkaman,Shahab Bonyadirad,Ali Saeedmanesh,Khalil soleimani,Hosein Reza Lotfi,Roya Jowkar,Ali Alipour 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.41 No.4
The aim of this study is to present a new and suitable connection for I-shaped beams and box columns that is both constructionally convenient to implement and reliable in terms of its performance. Six full-scale experimental samples were constructed and subjected to cyclic Quasi-static loading. The first sample included an I-shaped beam which was directly connected to a box column, the second sample incorporated a channel link, and stiffened channel links were used in the remaining four samples. The results show that compared to the direct connection, using the stiffened channel link significantly improves the performance of the connection and increases its ultimate strength and ductility by 58% and 70%, respectively. Also, these connections satisfy the code-specified criteria for special moment resisting frames. They are therefore a suitable detail for rigid I-shaped-beam-to-box-column connections in seismically active regions.