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Mr A. Edwards (Higgs & Hill): As a non-member of the Institution I found this paper exceptionally readable and comprehensive, and I would congratulate the authors on giving such a clear picture of the development of the project and of its complexity.
An attempt is made in this paper to summarise the behaviour of a range of shear wall systems, starting from an elementary planar shear wall to a complex arrangement of core systems. Emphasis is placed on the structural interaction that exists between the walls and floor system. Significance of non-uniform torsion theory as applied to open core structures is explained with a practical example problem. A two-step procedure is presented for a comprehensive analysis of complex shear wall buildings; one for evaluating the structural contribution of the out-of-plane stiffness of the floor system and the other for a 3-dimensional analysis in which open core structures are modelled as equivalent columns. B.S. Taranath
At a recent conference on the subject of ‘Durability and design life’, opinion was divided as to whether it would be possible to define ‘design life’ and designate appropriate periods, and, if so, whether it would serve a useful purpose. The reasoning for establishing the intended design life of any particular structure is put forward here. G.E. Bratchell