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- Al-Emrani, Mohammad, 1967, et al.
(författare)
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Girders with Trapezoidally Corrugated Webs -- Under Patch Loading
- 2011
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Ingår i: EUROSTEEL 2011. - 9789291471034 ; 2, s. 620-625
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Konferensbidrag (refereegranskat)abstract
- This paper deals with the buckling and postbuckling behaviour of plate girders with corrugated web under a concentrated load on the top flange. A couple of design models and experiments from earlier studies are briefly reviewed.Further, six additional experimental tests have been performed on a girder with thin corrugated web. A FE-model of this girder is then developed and the behaviour of the girder is validated through comparisons with the girder used in the tests. The ultimate load and the postbuckling behaviour were determined by both laboratory tests and finite element simulations for three different positions of a narrow load strip across the flange, namely at: (1) an inclined fold, (2) the junction between two folds, (3) a longitudinal fold. Finally, a parametric study is performed using the FE-model where the influence of certain parameters on the ultimate load and buckling behaviour is investigated. The results from this parametric study are compared and evaluated together with two design models chosen to be the most suitable.
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| 2. |
- Heistermann, Christine, et al.
(författare)
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Loss of pretension in bolted connections : influence of loading
- 2011
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Ingår i: Proceedings of the 6th European Conference on Steel and Composite Structures. - Budapest : European Convention for Constructional Steelwork, ECCS. - 9789291471034 ; , s. 399-404
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Konferensbidrag (refereegranskat)abstract
- A common problem in bolted connections is the self-loosening effect of bolts over time. Therefore the remaining strength in a slip resistant connection can only roughly be estimated for a certain point of time. A possible solution ot avoid self-loosening is the use of lockbolts, which have been studied in order to achieve recommendations for connections which are "free from maintenance". The pretension force in the bolt unavoidably reduces over time due to creep of primer, forces in bolts and in plates. These effects are experimentally studied. For all types of connections this effect is very important and in this paper the focus is brought on lap joints, where the influence of various types of loading is examined.
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| 3. |
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| 4. |
- Limam, Marouene, et al.
(författare)
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Modeling three dimensional friction connection for wind towers using finite element methods
- 2011
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Ingår i: Proceedings of the 6th European Conference on Steel and Composite Structures. - Budapest : European Convention for Constructional Steelwork, ECCS. - 9789291471034
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Konferensbidrag (refereegranskat)abstract
- The tubular steel towers supporting wind turbines account for about 15 to 20% of the total installation costs and their optimization may lead to substantial savings with regard to costs and use of material. An innovative solution for assembling joints of a tubular tower for wind turbines has been studied in an European research project called HISTWIN (High-Strength Steel Tower for Wind Turbine). This solution is simpler to produce and 80% less expensive than the traditional flange connection.The paper deals with connections used to assemble sections of tubular steel towers supporting wind turbines. The starting point is a rather simple lap joint connection .This connection is chosen for the sake of simplicity but still having possibility of general conclusions. After that more realistic connection between two tower segments is presented, each section has about 3m high and 2 m in diameter and they are connected by 222 M30 high-strength bolts.Modeling such FE models, which consists of several parts in contact, requires knowledge in contact mechanics with friction, meshing techniques as well as stability and convergence algorithms.A short parametric study is made to evaluate influence of number of bolts and the pretension force on the tubular tower failure mode.Results of FEA and resistance according to European codes, series EN1993-1-8 is considered. Keywords: Finite Element Model, Gap, High Strength Friction Grip Connection, Tubular Steel Tower, contact.
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