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The Structural Engineer, Volume 70, Issue 18, 1992
Jack Waller will succeed Tony Cusens as President of the Institution 1992-93 at an Ordinary Meeting at Institution headquarters on 1 October 1992. The handover will be at 6 pm when the new President will give his Presidential Address ‘An agenda for a New Age’, the full text of which will be published in The Structural Engineer in November.
Laboratory tests on 15 reinforced concrete external beam/column connections are described. Three reinforcement details were used - bending beam tension steel up or down into the column and the ‘U’ bar - in conjunction with which beam depth, beam tension steel percentage and column load were varied. Internally strain-gauged reinforcement was used to obtain detailed distributions of strain along the beam and column bars and so investigate the intrinsic mechanisms of connection behaviour. Results are presented to indicate the performance of the details under the different test conditions, particularly influences exerted by the test parameters on reinforcement strain distributions. Bond stresses along the beam tension steel are evaluated, and the means by which each detail effected load transfer by bond is described. Recommendations are made concerning the effectiveness and suitability of each detail in practical connection design. R.H. Scott
Century Tower is a twin-tower 100m-tall office building in central Tokyo completed in early 1991. Lateral resistance is provided in one direction by rigid frames and, in the other, by eccentrically braced frames of unusual geometry. Being taller than 6Om, the structure had to pass the special approval procedures of the Japanese Ministry of Construction. These procedures involved the explicit non-linear analysis of the structure for moderate and extreme earthquakes. The paper describes the basis of the design and the analyses carried out. A.J. Fitzpatrick