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RISS 인기검색어
- 검색키워드
- 저자 : Behrokh Hosseini Hashemi (검색결과 2 건)
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On the Evaluation of the Use of EKBs to Improve Seismic Performance of Steel Frames
Behrokh Hosseini Hashemi,Mehdi Alirezaei 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.1
In this paper a new eccentric and knee bracing system named Eccentrically Knee Brace (EKB) is introduced and its merits to increase seismic performance of the steel frames is investigated. To assess the seismic behavior of this system compared to other steel braced systems, numerical modeling using finite element software is implemented. Subjected to moderate earthquakes, the knee element exclusively dissipates the seismic energy through plastic shear distortion, while the other structural elements remain in elastic range. Under severe earthquakes, plastic deformation of the knee element will be halted by the stopper subsequently causing yielding of the link element. Finally, a simplified analytical model is derived to predict the bilinear behavior of the EKBs.
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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.
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