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RISS 인기검색어
- 검색키워드
- 저자 : S. Jeyarajan (검색결과 2 건)
- 무료
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- 유료
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Plastic Hinge Analysis of Composite Frames under Column Loss Scenario
S. Jeyarajan,J.Y. Richard Liew,C. G. Koh 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.3
This paper presents a plastic hinge analysis approach for static and dynamic assessment of composite frames under column loss scenarios. The proposed plastic hinge analysis method can be implemented using spreadsheet programming and it is computational less expensive compared to numerical analysis. A step-by-step first-order elastic-plastic analysis by tracking the formation of plastic hinge in a composite floor is performed until a collapse mechanism is formed to establish the static loaddisplacement behaviour and collapse load of a composite floor subject to sudden column loss. Floor deflections corresponding to the formation of each plastic hinge are evaluated to predict the static load-deformation response of composite frame. The composite floor joint effects can be included in the plastic hinge analysis by calculating the joints’ axial resistance and moment resistance using the Eurocodes’ component method. A dynamic assessment approach is then used to predict the dynamic response of frame due to sudden column loss. The accuracy of the proposed method is verified by comparing the predicted results with those from the established test and numerical results available in the literature.
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Progressive Collapse Mitigation Approaches for Steel-Concrete Composite Buildings
S. Jeyarajan,J.Y. Richard Liew,C.G.Koh 한국강구조학회 2015 International Journal of Steel Structures Vol.15 No.1
This paper investigates the robustness of steel-concrete composite frames under sudden column loss. Various lateral loadresisting systems, including contributions from bracing systems, composite slab and joints are taken into account in analysingbuildings against progressive collapse. Robustness of ten-storey steel buildings with (1) diagonal braces at corners, (2) centrecore wall, (3) rigid moment joints are analysed for corner, perimeter and internal column loss. The analyses conclude thatsimple braced frames are more susceptible to the progressive collapse compared with the moment resisting frames which hashigher redundancy to redistribute the loads arising from sudden column loss. Various mitigation approaches are proposed toimprove the progressive collapse resistance of the simple braced frames. End-plate beam-to-column connection is proposedinstead of fin-plate connection due to greater rotational stiffness and higher moment resistance. Vierendeel truss is proposedat the top floor level in a multi-storey building to redistribute the load due to sudden column loss. In addition, modified finplateconnection is proposed in which a plate is welded to the bottom beam’s flange to increase joint’s rotational restraintshelping to reduce beam’s vertical displacement in the event of sudden removal of column.
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