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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
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