Damped Earthquake Response of Non-symmetric Multi-storey Structures

Increasingly over the past few months we have become aware of the grave concern of members for ordinary people involved in the HAC structures. People with houses to sell, those who wish to raise second mortgages and so forth, can be in a most unfortunate situation, since in the view of building societies and similar organizations these buildings are suspect even if HAC has been used only in standard lintels over windows or door openings, specifically defined in the DOE circular letter of 20 July 1974 as not being 'structural work for the purposes of this letter'. Verulam

A theory is presented for torsion analysis of symmetrical corewall structures for tall buildings by discrete method in conjunction with transfer matrix formulation. Apart from warping deformation, the possible changes at different storeys such as the thicknesses of walls and the existence and the depths of connecting beams or slabs, are taken into account in the analysis. In an example for a particular case, the correlation of the proposed theory with results calculated from other published methods is shown. The generality and flexibility of the application of the theory is enhanced by the fact that the maximum size of matrices involved in the analysis is only 4 x 4, which is within the practical bound for design office calculations. T.C. Liauw and King-Wai Leung

The design of remforced concrete deep beams is not yet covered by the new British Code CP110:1972. The major design methods currently available are reviewed in this paper, namely, those proposed by ( l ) the European Concrete Committee in 1970; ( 2 ) the American Concrete Institute in 1971; and (3) the Portland Cement Association in its long standing document ST66 issued in 1946. The more recent proposals by the authors and their co-workers are also explained; unlike the others, the authors' proposals cover also deep beams with web openings. F.K. Kong, P.J. Robins and G.R. Sharp