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RISS 인기검색어
- 검색키워드
- 저자 : Ioannis Vayas (검색결과 4 건)
- 무료
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- 유료
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Innovative Dissipative (INERD) Pin Connections for Seismic Resistant Braced Fram
Ioannis Vayas,Pavlos Thanopoulos 한국강구조학회 2005 International Journal of Steel Structures Vol.5 No.5
Innovative dissipative (INERD) conections were developed for seismic resistant braced frames. The dissipative zones indeveloped: pin connections and U-shape connections. This paper presents studies on the pin conections, where the braces areconnected to their adjacent members by means of eye-bars and a pin runing through them. Experimental and theoreticalinvestigations show a high energy dissipation capacity of these connections that is due to the inelastic bending action of thepin. The susceptibility to brittle fracture or low-cycle fatigue is low as inelastic action takes place away from welds or stressadvantages provide a promise for a wide application of the invented connections for buildings and enginering structures inseismic regions.
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Ioannis Vayas,Theodoros Adamakos,Aristidis Iliopoulos 한국강구조학회 2011 International Journal of Steel Structures Vol.11 No.2
A new improved way for modeling steel composite straight bridges has been presented (Vayas, 2009; Vayas, 2010). The proposed model is based on the representation of steel I-girders through the use of equivalent trusses. The concrete slab is suitably represented by a set of bar elements. Diaphragms and stiffeners may also be taken into account. In contrast to the grillage model, which is usually used for the analysis of bridges, the recommended three dimensional model allows for a more reliable prediction of deformations and internal forces. This paper discusses the extension of the model to skewed composite bridges. The presence of skew makes the analysis complicated and for this reason the grillage analysis is not always recommended. Phenomena like differential deflections of the main girders during concreting and lateral displacements of the flanges can be adequately predicted using the proposed model. The new way for modeling composite bridges, using a spatial system of beam-like structural elements, can also be used for stability analysis of skewed bridges. Worked examples are provided to illustrate the set up procedure of the proposed modeling and to compare the different ways of analysis.
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Interaction Between Pallets and Pallet Beams of Steel Storage Racks in Seismic Areas
Konstantinos Adamakos,Stefano Sesana,Ioannis Vayas 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.3
Steel storage racking systems are heavily loaded light structures that need special attention in design. The problems increase for racks in seismic regions, where the structure is subjected additionally to high lateral forces. This paper focuses on the seismic design of pallet beams in pallet racking systems and concentrates on three issues in order to verify or improve rules of European Codes on racks: (1) the horizontal seismic forces on the pallet beams, (2) the developing horizontal bending moments and (3) whether the buckling length of the beams on the horizontal plane may be reduced due to a potential diaphragmatic action, off ered by the pallets. Investigations are based on theoretical and numerical analyses. It was found that opposite to the Code provisions the lateral seismic forces are not equal distributed between the pallet beams and, confi rming fi eld observations, that the forces directed towards the outside of the rack are higher compared to those directed towards the inner side. Concerning the horizontal bending moments appropriate correction coeffi cients were proposed that deviate from the codifi ed values. Finally, it was found that pallet friction does not aff ect so much the buckling length to safely reduce its buckling length.
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Lateral Stability Analysis for Composite Plate Girder Bridges
Pavlos Thanopoulos,Stella Louverdi,Andreas Spiliopoulos,Ioannis Vayas 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.2
The methods that are currently available in the Eurocodes for the design of bridge plate girders to lateral torsional buckling are outlined and discussed. The inapplicability of the classic elastic critical moment theory for deep girders, which are common in bridge practice, is demonstrated. The simplifi ed method of the equivalent fl ange in compression is applied instead, and its results are compared with those of specialised software which can accurately predict the elastic critical load of bridge girders. These widely accepted methods of design are compared to a previously published truss model which has been proposed for the simplifi ed, yet accurate, modelling of bridge plate girders. The results of both the critical load and the design load according to the Eurocodes are compared. For the truss model, the general method for the calculation of the design load is used. A variety of cross-sectional dimensions, lateral restraints and bridge confi gurations is examined. Emphasis is given in a two-span, two-girder steel concrete composite bridge with various bracing confi gurations, where many aspects of lateral torsional buckling design can be demonstrated. The advantages of the use of a 3D truss model from practicing engineers are discussed.
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