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RISS 인기검색어
- 검색키워드
- 저자 : Saeed Tariverdilo (검색결과 2 건)
- 무료
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Performance of Fully Restrained Welded Beam-Column Connections Subjected to Column Loss
Alireza Salmasi,Mohammad Reza Sheidaii,Saeed Tariverdilo 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.4
The beam-column connections are known as a fundamental component in steel moment-resisting frames. The present investigation studies the progressive collapse behavior of four various welded types of beam-column connections including, welded unreinforced flange-welded web moment (WUF-W), reduced beam section (RBS), welded flange plate (WFP), and welded flange-weld web connection with internal diaphragms (I-W). The nonlinear analysis with suitable finite element modeling has been generated to assess the connection's performance under a column removal scenario. The load–displacement curves, fracture modes, Von-Mises stresses, and other comparable theoretical results were described. The results are verified with existing experimental data. The results of the analyses showed that the studied models' overall failure occurs in the beam-column connection regions in the large rotation under the catenary action mode. The plastic strain accumulation occurred around the access hole, and the failure was initiated from these areas. Each of the investigated connections showed sufficient strength under column removal scenario. WFP connections demonstrated the best performance due to the top and bottom plates' presence and the keep away of critical stresses from the connection area. The RBS connections exhibited the weakest behavior due to absorbing excessive stresses and fast fracture and tolerating minimum vertical loads. Also, it is observed that in the designing of buildings exposed to the phenomenon of progressive collapse, the considerable axial load generated in the connections area should be considered in the design phase.
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Experimental and Numerical Study of a Tube in Tube Force Limiting Device
Jafar Ghalejoughi,Mohammad Reza Sheidaii,Saeed Tariverdilo 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.4
The buckling and sudden capacity loss of the compression member can be prevented using a proposed tube in tube force limiting device (TTFLD). In this way, the brittle post-buckling behavior of the compression member can be converted into an elasto-plastic behavior. The TTFLD consists of two tubes with unequal diameter, one of which is placed into the other tube. The outer tube operates as a casing for the inner compression tube and the fl exural stiff ness of the outer tube restrains the buckling of the inner tube. The present study has experimentally investigated and evaluated a number of experimental specimens. Next, numerical analysis of these specimens has been done using fi nite element software. Further, the behavior of the tube in tube force limiting device have been investigated under important parameters such as the gap between the inner and outer tubes (gap), the inner tube or main member slenderness ratio (λ), and the ratio of outer tube length to inner tube length ( L 2∕L 1) , by extending the numerical studies to further examples. Using this TTFLD is an eff ective, simple and economical method to prevent the buckling of compression member and can lead to a favorable increase in the bearing and deformability capacity of the compression members with diff erent values of slenderness ratio. The compressive strength of the member will increase signifi cantly, if the gap size is less than about 43% of the inner tube’s gyration radius, and the length ratio is greater than about 55%.
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