Flexural tests on X7/5 wire prestressed concrete beams made with High Alumina Cement (HAC) are described. The beams were artificially converted (in the range 10–100±5%) and observations were made on central deflection, strains, ultrasonic pulse velocities, cube compressive and prism flexural strengths, and concrete moduli.
Although the conversion caused some major changes in the concrete properties the effect on the ultimate moment capacity of the beams was minor, due to the under-reinforced nature of this particular section at these particular concrete strengths.
The characteristics of a partial boundary layer wind tunnel are established for simulated air flow over an urban environment and the wind excitation of small cantilever structures is examined. The process of modelling the natural wind is explained and techniques are outlined for the measurement of mean and r.m.s. response of small scale structures. The significance of such information for indicating the dynamic response of large scale structures is discussed.
The logical design of the layout of a multi-storey building is a conceptually and numerically complex task which, if an acceptable algorithm can be devised, is ideally suited to a computer-aided approach.
Previous work in multi-storey layout planning at Liverpool[1] has been concerned with methods of defining vertical links. The present work considers the problem of allocation of activities to the various levels of a multi-storey building and computer-aided solution based on the use of techniques of cluster analysis is proposed. The principles of the computer program are described and its use in multi-storey layout planning is assessed.

