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This paper describes the design and execution of Broadgate Exchange House, an exciting steel structure in London. This structure uses four tied-arches to clear span an entire office building 78m over a congested railroad track site. An important visual aspect of the building is the use offire engineering principles to allow the perimeter structural steel to be exposed. Special features include redundancy, corrosion protection, behaviour under patterned loads, and buckling analyses. This special structure combines the diverse roles of a bridge and an office building into one system with a clarity of expression which is the focus of the architecture. H. Iyengar, W.F. Baker and R.C. Sinn
In this second part of our biographical look at Alistair Day and the technique of dynamic relaxation, we review some of the exceptionally innovative and structurally demanding projects to have made use of the method.
In October 1984 the Minister for Housing & Construction announced that the Building Research Establishment would undertake a programme of investigations of dwellings constructed from large-panel systems (LPS). The structural adequacy and durability of large panel system dwellings, published recently, results from those investigations and is intended to assist local authorities and their consultants in appraisal of LPS dwellings. A summary sheet (IP8/87) has also been published. This states that the principal findings and conclusions from BRE’s own site investigations and from an analysis of private-consultants’ reports are: ‘No major structural failure of a LPS building in the UK has been reported since the programme of appraisal and strengthening of LPS building was carried out following the collapse of Ronan Point in 1968. The BRE has found no LPS building