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- Bergdahl, Lars, 1943
(author)
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Two lighthouses damaged by ice
- 1972
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In: Symposium on Ice and Its Action on Hydraulic Structures, IAHR, 1972, Leningrad. ; , s. 234-238
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Conference paper (other academic/artistic)abstract
- Two cases of damage to lighthouses in the Balic are reported. The maximum ice pressure is estimated from the mode of failure of the lighthouses. The calculations give a horizontal load of 1.1 to 1.7 MN per metre width of structure.
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- Unnerbäck, Axel
(author)
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Europarådet och byggnadsvården
- 1976
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In: Kulturminnesvård. - Stockholm : Riksantikvarieämbetet. - 0346-9077. ; [1]:2, s. 22-27
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Journal article (pop. science, debate, etc.)
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- Hallengren, Anders, 1950-
(author)
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Indien på väg mot världsrymden
- 1978
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In: Värld och vetande. - 0346-4873. ; 27:6
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Journal article (pop. science, debate, etc.)abstract
- Det innovativa indiska rymdprogrammmets historik samt dess sociala och politiska kontext.
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- Karlsson, Inge, 1943-, et al.
(author)
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Förespända lädbalkar belastade med vridande och böjande moment samt tvärkraft
- 1976
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Reports (peer-reviewed)abstract
- Five rectangular prestressed concrete beams have been tested. Dimensions of the beams were 0.3 x 0.6 x 2.5 m (three beams) and 0.4 x 0.8 x 4.2 m (two beams; flanges 0.35 m), The medium prestress level for the concrete varied between 2.1 and 3.2 MPa. The beams were tested in combined torsion, T, bending, M, and shear, V. The ratio of the torsion to bending moment varied between T:M = 0.125:1 and 0.4:1. The ratio of the bending moment, M, to the shear force, V, times the beam depth, h, varied between M:Vh = 1:0.22 to 1:0.27. In chapter 2, the beams and the testing arrangement are described (Figs. 2.1 - 2,11).In chapter 3, theoretical values are presented for bending and torsional stiffnesses and for cracking and ultimate strenghts. The theoretical values are calculated according to the truss analogy [3], [7] and according to the code for bridge design [10] issued by the Swedish Road Administration. In chapter 4, experimental values are presented. Photos of the beams after failure are given in Figs. 4.1 to 4.5. Theoretical and experimental values are given for curvature (Figs. 4.9 - 4.11), twist (Figs. 4.12 - 4.15), bending stiffness (Figs. 4.16 - 4.18), and torsional stiffness (Figs. 4.19 - 4.22). Reinforcement strains are given for the prestressed reinforcment (Figs. 4.23 - 4.27), for the longitudinal compression reinforcement (Figs. 4.28 - 4.29) and for the stirrups (Figs. 4.31 - 4.35). Concrete stresses and strains are also presented (Figs. 4.36 - 4.40). The ultimate strength is discussed. Comparisons of theoretical and experimental results are given in Table 4.1 and in Fig. 4.41. Generally the truss analogy has given a good estimate of the torsional stiffness and of the ultimate strength.
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