Correspondence on Acceptance Criteria of Concrete (With Particular Reference to Small Projects) by H

Hybrid structures We have received a letter signed jointly by Dr. D. D. Matthews, Chairman CSB/39 (concrete Code), and Mr B. A. Haseltine, Chairman CSB/33 (masonry Code): The January, February, May, June, and September 1980 issues of The Structural Engineer contained a running debate on the subject of the restraint of loadbearing masonry walls by precast concrete floors and the implications for the robustness of hybrid structures. We realise, from the correspondence to Verulam and from questions raised at other meetings, that this is a subject that is bothering many members of our profession. We thought, therefore, that it would be helpful if we gave our joint views on the subject. Verulam

The use of steel has been greatly influenced by the requirements for fire protection, design standards, and manufacturing processes. Concrete casing could be replaced by water filled fire protection of main columns. The departure from traditional RC construction would permit bigger modular plan clearances and lighter demountable construction. The construction of wide spans with either arch or dome construction, and the possibilities of single-layer shell type structures and their potential uses, are considered. R.G. Taylor

It is postulated that there will be, in the future, an increasing pressure on structural engineers to take always the widest view possible. Designs should be created harmoniously, not merely to resist various actions in the best way but also to ensure quality of execution by taking sociological changes into account. Jan Bobrowski