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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
External, unbonded tendons have attracted much attention recently, while internal, bonded tendons have come into criticism and are going out of favour. It is important in future projects where external tendons are going to be used that suitable details and techniques are developed to give the desired strength and durability. A lot can be learnt from the way external tendons are used in other parts of the world, where the feature is more common. This paper describes the design of the Bangkok Second Stage Expressway which is currently under construction using the latest techniques developed in the United States and France and is one of the largest ever uses of external tendons for a viaduct project.
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