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Grouted post-tensioned concrete as a bridging material is compared with alternative choices for regularly occurring situations. Some examples are presented, and a commentary on comparative performance is included. Grouting of tendons is dealt with in some detail covering the development of current methods, design criteria, details, and inspection methods. The paper draws some tentative conclusions on the future of the
M.V. Woolley and G.M. Clark
In the Building Act 1984 there came into force legislation which would allow private persons to act either as Approved Inspectors or Approved Persons. This had resulted from the Government’s intention to make building control more open to competition and to allow professionals to be involved in certifying not only their own work, but also that of others. The legislation, which was carried further by the coming into force of the Building (Approved Inspector, etc.) Regulations 1985, set down certain of the details which would be required to be satisfied which included, among other things, the matter of insurance. It was principally on that one point that the scheme foundered from l985 until the latter part of last year.
The planning and conduct of a series of tests on five full-scale, multistorey steel frames is reported. Each frame was three storeys in height X two bays wide and was tested under gravity loading in a non-sway mode. Comprehensive measurements were taken at all stages of deformations and struins; these permitted full histories of member deflections, joint rotations, bending moment distribution and column loading to be constructed. Examination of these has enabled several important observations on the
influence of realistic forms of beam-to-column connection on overall frame behaviour to be made. Comparisons with predictions of member strength according to BS 5950: Part 1 show signifcant reserves of strength to be present.
D.B. Moore, Professor D.A. Nethercot and P.A. Kirby