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Träfflista för sökning "hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Samhällsbyggnadsteknik) hsv:(Byggproduktion) srt2:(1990-1999)"

Sökning: hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Samhällsbyggnadsteknik) hsv:(Byggproduktion) > (1990-1999)

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  • Plos, Mario, 1963, et al. (författare)
  • Nonlinear FE Analyses of RC Bridge Frame Corners, Based on Fracture Mechanics
  • 1998
  • Ingår i: Journal of Bridge Engineering. - 1084-0702. ; 3:4, s. 204-209
  • Tidskriftsartikel (refereegranskat)abstract
    • Reinforced concrete frame corners were analyzed using the nonlinear finite-element method and fracture mechanics. The objective of the study was to determine whether the reinforcement detailing in frame bridges could be simplified, with preserved structural safety, by splicing the reinforcement within the frame corner. A constitutive model for concrete, based on nonlinear fracture mechanics and plasticity, was used. An interface model was used to account for slip between the reinforcement and surrounding concrete. Analysis of previously tested frame specimens, with both spliced and unspliced corner reinforcement, was used to study the overall behavior of the frames; more detailed analysis of only the frame corner regions was used to study the influence of the reinforcement splices. The analyses were found to reflect the mechanical behavior of the specimens, and are in good agreement with the test results. The analysis results support, together with the test results, the idea that it would be feasible to splice all reinforcement in a portal frame bridge within the corner regions.
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  • Elfgren, Lennart, et al. (författare)
  • Design of high performance concrete structures in Sweden
  • 1998
  • Ingår i: International Symposium on High-Performance and Reactive Powder Concretes. - Sherbrooke, Que : University of Sherbrooke. ; , s. 139-156
  • Konferensbidrag (refereegranskat)
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  • Granath, Per, et al. (författare)
  • Behaviour of girder webs subjected to patch loading
  • 1999
  • Ingår i: Journal of constructional steel research. - 0143-974X .- 1873-5983. ; 50:1, s. 49-69
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper concerns the behaviour of bridge girder webs subjected to concentrated forces that are introduced in the web during launching, a load case usually referred to as patch loading. So far, this type of loading has, in engineering practice, been dealt with using formulas originating from investigations concerning the ultimate load carrying capacity. Numerous bridge launchings have, however, led to unwanted damages of the girder web, i.e. plastic deformations of such magnitudes that the webs had to be repaired. To avoid these damages it is necessary to have a design method, for launching situations, which focuses more on avoiding some irreversible behaviour than on the ultimate load carrying capacity. Such a design method has to be based on a deeper understanding of the behaviour of the girder. In Ref. [1] the first author discusses the fact that yielding of the flange occurs only after the web plate has been severely damaged. This paper describes the deformation behaviour of the web plate due to patch loading. For small loads the deformations will be similar to the first linear buckling mode. As the load increases a smaller buckle, in the opposite direction, will start to develop in the web plate close to the load. This behaviour, which may be named post-critical buckling, occurs also for girders of a perfectly elastic material. The investigations are based on laboratory tests and non-linear finite element analyses of three typical girders representing different slenderness categories.
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