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| 2. |
- Crocetti, Roberto
(författare)
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Bågar
- 2016. - 5
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Ingår i: Limträhandbok : Del 2. Projektering av limträkonstruktioner - Del 2. Projektering av limträkonstruktioner. - 9789198030464 ; , s. 153-165
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Bokkapitel (populärvet., debatt m.m.)
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| 3. |
- Crocetti, Roberto
(författare)
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Horisontell stabilisering
- 2016. - 5
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Ingår i: Limträhandbok : Del 2. Projektering av limträkonstruktioner - Del 2. Projektering av limträkonstruktioner. - 9789198030464 ; , s. 170-197
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Bokkapitel (populärvet., debatt m.m.)
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| 4. |
- Crocetti, Roberto, et al.
(författare)
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Innovative Timber-Concrete Composite Structures with Prefabricated FRC Slabs
- 2015
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Ingår i: Journal of Structural Engineering. - 0733-9445. ; 141:9
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Tidskriftsartikel (refereegranskat)abstract
- This paper concerns the development of innovative composite floor systems, comprising timber beams and prefabricated concrete slabs. For the development of this new system, two properties were regarded as vital, as follows: (1) good stiffness, and (2) a high degree of prefabrication. Shear connection systems installed using completely dry processes were used. Innovative and very efficient materials, such as fiber-reinforced concrete (FRC) and modified wood, were used for the manufacture of the specimens. The research reported in this paper was conducted in two phases, as follows: (1) the mechanical properties of different shear connectors were investigated (Phase A), and (2) on the basis of these experiment's results a second investigation was carried out in order to study the behavior of full-scale timber-concrete composite slabs (Phase B). During Phase A four different configurations, with a total of eight specimens, were laboratory tested in shear. During Phase B two full-scale floor elements, each with a different shear connection system, were laboratory tested in bending. The two shear connector systems used in the investigation were (1) shear anchor-keys of furfurylated wood, and (2) inclined steel tubes. Both of the proposed connection systems performed more than satisfactorily, showing a very high degree of composite action even at load levels close to the failure load. Moreover, it appeared that the assembling of the prefabricated fiber-reinforced concrete slab with the underlying beams occurred in an extremely easy manner. (C) 2014 American Society of Civil Engineers.
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| 5. |
- Crocetti, Roberto, et al.
(författare)
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Raka balkar och pelare
- 2016. - 5
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Ingår i: Limträhandbok : Del 2. Projektering av limträkonstruktioner - Del 2. Projektering av limträkonstruktioner. - 9789198030464 ; , s. 53-69
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Bokkapitel (populärvet., debatt m.m.)
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| 6. |
- Crocetti, Roberto
(författare)
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Snedsågade balkar, krökta balkar och bumerangbalkar
- 2016. - 5
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Ingår i: Limträhandbok : Del 2. Projektering av limträkonstruktioner - Del 2. Projektering av limträkonstruktioner. - 9789198030464 ; , s. 102-118
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Bokkapitel (populärvet., debatt m.m.)
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| 7. |
- Crocetti, Roberto, et al.
(författare)
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Stress-laminated-timber decks: state of the art and design based on Swedish practice
- 2016
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Ingår i: European Journal of Wood and Wood Products/Holz als Roh - und Werkstoff. - : Springer Science and Business Media LLC. - 1436-736X .- 0018-3768. ; 74:3, s. 453-461
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Tidskriftsartikel (refereegranskat)abstract
- Stress-laminated-timber (SLT) bridge decks area valid alternative to conventional short- and medium-spanbridges in terms of cost and performance. SLT decks aremade from a number of planks or glulam beams positionedside by side and stressed together using high-strength steelbars. A concentrated load can therefore be distributed fromthe loaded beams onto adjacent beams due to the resistingfriction caused by the pre-stressing of all beams in thedeck. This paper describes the state of the art of SLT bridgedecks, with special emphasis on Swedish practice. Theeffect of butt joints on deck deflection and solution appliedto accommodate the loss of pre-stress are shown. Simpledesign tools for the preliminary design of road bridges areillustrated. Best practice with regard to some detailing,water protection and durability is also discussed. Finally,possible developments of SLT bridges are discussed.
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| 8. |
- Crocetti, Roberto, et al.
(författare)
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Timber Arch Bridges with V-shaped Hangers
- 2019
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Ingår i: Structural Engineering International. - : Informa UK Limited. - 1016-8664 .- 1683-0350. ; 29:2, s. 261-267
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Tidskriftsartikel (refereegranskat)abstract
- The arch is a very efficient load bearing structure, especially when its shape is affine to the funicular of forces. However, if live loads are predominant as compared to permanent uniformly distributed gravity loads, the arch will be subjected to substantial bending moments, thus losing a great part of its structural efficiency. In traditional arch bridges with hangers arranged in a vertical manner, asymmetrical loads would cause a substantial deviation of the pressure line from the axial line of the arch. In this paper, an innovative concept for timber arch bridges is introduced where V-shaped hangers, rather than vertical hangers, are used. The adoption of V-shaped hangers significantly contributes to the reduction of the eccentricity between the pressure line and the axial line of the arch, thus decreasing the magnitude of bending moments in the arch. The paper discusses the advantages of using V-shaped hangers as an alternative to vertical hangers, both in terms of statics, in-plane stability and dynamic efficiency. Moreover, the design and the recent construction of a parabolic three-hinged arch made of timber, with a steel V-shaped hanger is thoroughly discussed in the paper.
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| 9. |
- Crocetti, Roberto
(författare)
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Utformning av limträdetaljer
- 2016. - 5
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Ingår i: Limträhandbok : Del 2. Projektering av limträkonstruktioner - Del 2. Projektering av limträkonstruktioner. - 9789198030464 ; , s. 228-235
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Bokkapitel (populärvet., debatt m.m.)
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| 10. |
- Danielsson, Henrik, et al.
(författare)
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Brittle Failure Modes in Nailed Steel Plate Connections
- 2016
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Ingår i: World Conference on Timber Engineering 2016.
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Konferensbidrag (refereegranskat)abstract
- This paper deals with theoretical and experimental investigations of nailed steel plate connections. For the experimental part, a total of 43 laboratory tests on connections loaded in tension parallel to the grain are reported. The paper deals also with finite element analysis of the connection, presenting a study on the 3D stress distributions within the wood member and a study of the progressive wood fracture course by the use of a 3D nonlinear fracture mechanics model, more precisely a cohesive zone model. Results of the experimental tests are compared to results of the numerical analyses and to strength predictions according to Eurocode 5. The comparison between theoretical and experimental results indicate that the Eurocode 5 design approach for plug shear failure in nailed steel plate connections might be nonconservative in relation to predicted strength values. Also failure modes predicted by Eurocode 5 are often erroneous. Results of the numerical analyses indicate that load eccentricity has a major influence on the connection strength.
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