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The analysis of the damped and undamped earthquake response of non-symmetric multi-storey structures is presented, with consideration of the foundation mass and partial restraint of the structure in the subgrade. The analysis is based on the continuous connection method using the normal modes of the structure. Proportional and constant
damping are considered.
E. Mendelson and M. Baruch
A series of static tests on thin walled square box specimens, direction fixed at their ends, and subjected to axial overload until gross inelastic distortion occurred are described in this paper. Observations were made on the mode of buckling, the peak load sustained, and the load-shortening characteristics. A simple theory is also presented in which no account is taken of elastic deformations, but folding is assumed to occur along straight lines, together with kinking of the corner edges, and, by assuming a kinematically admissible pattern of such folds, a virtual work analysis is derived to predict theoretical load-shortening characteristics. Reasonable agreement is shown to exist between the theoretical and experimental results.
B. Rawlings and P. Shapland
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'.