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Restrained composite columns

By Ian Melville May


This Thesis describes the development of an analysis for\ud inelastic columns, with cross-sections composed of one or more\ud materials, loaded with axial load and biaxial moments. The\ud column can have both rotational and directional restraints at\ud its ends. The analysis has been programmed for a computer and\ud subsequently tested against published results for steel columns,\ud reinforced concrete columns, and concrete-encased steel composite\ud columns and shown to give good agreement.\ud A test rig with an axial load capacity of 2MN and capable\ud of testing full-scale columns of any practical length has been\ud designed and built. Columns with elastic and elastic-plastic\ud rotational restraints or, pin-ends or any combination can be\ud tested and column end-moments of up to 50 kNm can be applied\ud through the beams. One important feature of the test rig is sets\ud of crossed knife-edges, which give both major and minor axis\ud rotational freedom and thus allow accurate positioning of the\ud axial load.\ud Eight elastically restrained concrete-encased steel composite\ud no-sway columns have been tested, three with biaxial restraints\ud and loadings, using the rig. The results from the tests have\ud been compared with predictions using the computer program and\ud agreement between the observed and predicted results for ultimate\ud loads, deflections, and end-moments is good.\ud The behaviour of column lengths within rigid-Jointed no-sway\ud frames with both plastically and elastically designed beams has\ud been studied. For the case of a column with elastic restraints\ud design proposals have been checked and shown to be conservative.\ud When the beams are designed plastically it is recommended that a\ud conservative approach should be adopted until further research\ud has been carried out into this topic

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  1. (1962). 18, Methods for tensile testing of metals,
  2. (1967). A computer method for the analysis of restrained columns,
  3. (1968). A more exact computation of failure loads of composite columns, doi
  4. (1973). A new approach to column design. Department of the Environment,
  5. (1972). An experimental study of continuous columns, doi
  6. (1972). Analysis and design of reinforced concrete columns, doi
  7. (1971). Axially loaded steel columns, doi
  8. (1964). Beam-column experiments,
  9. (1969). Biaxial moment thrust curvature rotations,
  10. (1976). Column behaviour and deflection control In steel frames,
  11. Columns under combined bending and thrust,
  12. Composite columns of concrete and steel, doi
  13. (1930). Composite columns, doi
  14. (1967). Computation of failure loads of composite columns, doi
  15. (1976). Cross-section slenderness ratlos,
  16. (1969). Derivation of formulae for the design of rectangular composite columns, doi
  17. (1960). Design criteria for reinforced concrete columns under axial load and biaxial bending. doi
  18. (1970). Design of slender columns,
  19. Design of unbraced steel columns subjected to biaxial applied end-moment,
  20. (1966). Determining the relation between moment, axial load and curvature for structural members,
  21. Die Knickfestigkeit gerader Stube, doi
  22. Die Stabilitgt zentrisch und exzentrish gedrückter Stibe aus Baustahl, Sitzungsberichte der Akademie de Wissenschaften in
  23. Die Tragfahigkeit des exzentrisch beanspruchten und des querbelasteten Druckstabes aus einen ideal plastischen Material, Sitzungsberichte de Akademie der Wissenschaften In
  24. Discussion on Reference 33,
  25. (1744). Do curvis etastis,
  26. Draft specification for cased struts,
  27. (1967). Eccentrically loaded steel columns with Initial curvature,
  28. (1974). Effective lengths of columns
  29. (1966). Elastic-plastic column stability and the design of no-sway frames, doi
  30. (1959). Encased steel stanchions and ßS449, doi
  31. (1967). Experiments on H-columns under biaxial bending,
  32. Further studies of the strength of beam-columns,
  33. (1971). Handbook on structural steelwork doi
  34. In-plane failure of steel columns subjected to uniaxial applied end-moments,
  35. (1973). Inelastic column behaviour,
  36. (1968). Inelastic H-columns under biaxial loading,
  37. (1974). Inolastic bohaviour of rotationally restrained columns under biaxial bonding,
  38. (1963). Institution CPI14 : 1957, The structural use of reinforced concrete in buildings,
  39. (1959). Institution, BS449: $959, The use of structural steel in building,
  40. (1972). Institution, CPIIO: Part 1: 1972, The structural use of concrete,
  41. (1948). Institution, SS449: 1948, The use of structural steel in building,
  42. Investigation of the long concroto column in a frame subjoct to latoro) loads.
  43. (1969). Load carrying capacity of ccmposito columns,
  44. Local buckling in continuous composite beams,
  45. Numerical procedure for computing deflections, moments and buckling loads,
  46. (1963). Properties of concrete,
  47. (1957). Rapid design of multi-storey rigid-jointed steel frames, Note A58, Building Research Station,
  48. (1955). Recherche sue le flambement de coionnes on acier A37 a profit en double to soil icitees obliquement,
  49. (1954). Residual stress and the compressive strength of steel.
  50. Residual stresses in hot rolled sections, doi
  51. (1971). Residual strosses in hot rolled sections.
  52. Resistanco dos pietas camprimdes, Congres international do procodds do construction,
  53. Restrained Column design,
  54. (1964). Safe loads on I section columns in structures designed by plastic theory, doi
  55. (1956). Savings to be effected by the more rational design of cased stanchions as a result of recent full size tests,
  56. (1971). Second Report on fully-rigid multi-storoy welded steel frames.
  57. (1936). Some tests of steel columns encased in concrete, doi
  58. (1942). Steal columns of rolled wideflange section,
  59. (1924). Steel reinforced with concrete,
  60. Strength of steel columns,
  61. (1955). Studies In composite construction, Part II. The interaction of floors and beams in multi-storoy buildings,
  62. Sur la forco de colonnes, M3molres do I'Acaddmio de
  63. Test of a fully continuous multi-storey frame of high yield steel.
  64. (1968). Test of a multi-storey rigid steel frame.
  65. (1912). Tests of columns: An investigation of the value of concrete as reinforcement for structural steel columns,
  66. (1967). Tests on stability of concrete encased I-beams, Part One, The Consulting Engineer,
  67. (1936). The behaviour of a p, l i lar forming part of a continuous member in a building frame.
  68. (1975). The design of composite bridges, doi
  69. (1962). The effect of concrete encasement on eccentrically loaded steel columns,
  70. (1957). The effect of concrete encasement on the behaviour Of steel framed buildings,
  71. The eiasto-plastic behaviour of columns under biaxial loading.
  72. (1966). The elastic-plastic stability of stanchions bent about two axes,
  73. (1974). The measurement of residual strosses. Report on research project,
  74. The plastic design of columns doi
  75. The stability of frames, Porgamon, doi
  76. (1958). The stability of tall buildings. doi
  77. The stanchion problem in frame structures designed according to ultimate carrying capacity, doi
  78. (1975). The ultimata stroncth of biaxially restrained columns, CESLIC Report CCI2,
  79. (1968). The ultimate load capacity of elastically restrained H-columns under biaxial bending, doi
  80. (1973). The ultimate strength of composite columns in biaxial bending, doi
  81. (1974). The ultimate strength of continuous composite beams,
  82. (1974). TP95A Simple design of casod struts. 0120 British Standards Institution,
  83. (1965). Ultimate strongth of composite beams, doi
  84. (1910). Untersuchungen Ubnr Knickfestigkeit, Mitteilungen über Forschungsarbeiten auf dem Gebiete des Ingenieurwesens, doi

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