This paper examines the enhancement to the shear resistance aflbrded by links and the horizontal bars provided at the centre of the cross-section of a member. The rules for estimating the contributions of web reinforcement to the shear resistance have been studied with the help of tests on beams and measurement of stresses in the steel using strain gauges. The study also includes an examination of the rule for enhancement to the punching shear resistance of flat slabs, provided by the central mesh reinforcement. S.B. Desai
Mr G. E. Bratchell (F) It is good to see that Dr Brohn is still pursuing the improvement of qualitative skills, and I feel that he should have more support from practising engineers who will benefit. We need more failures like his Phineas Gage needed a hole in the head!
All building materials are liable to return to the constituent components from which they were manufactured under the action of the environment to which they are subjected. The durability of the various building materials depends on the quality of product and the aggressiveness of the atmosphere immediately surrounding them. J. Locke
Eurocode 3 (DD ENV 1993-1-1:1992) provides design guidance on the stability of rectilinear (beam and column) structural frames but it does not embrace the design of slender monotubular (curvilinear) arches, since it provides no information on geometric imperfections, buckling lengths or validated amplified sway moment expressions for such arches. This has arisen as a significant limitation in the preparation by CEN/TC 284 of a draft European standard for the design of greenhouses, since slender arches formedfrom a circular hollow steel section tube are used extensively throughout Europe in the production of ‘tunnel greenhouse’, or ‘polytunnel’frames. Slender arches are also used increasingly in garden-centre and emergency-aid structures, as an architectural feature in glazed barrel-vaulted roofs, and for swimming-pool covers. To address the immediate requirement for rational design procedures for slender steel arches used in polytunnel greenhouses, collaborative research involving full-scale collapse testing, determination of tube behaviour, and computational modelling, has been undertaken recently in France and the UK. Ph. Roux, A.P. Robertson and R. Motro
In 1988 this Institution took the decision to establish a Research Panel. Under the chairmanship of Professor Patrick Dowling, FRS, FEng, the first task of the eight members was to define the Panel’s role - the initial brief having been couched in deliberately general terms so as to leave the Panel free to identify its own tasks, methods of working, etc. Professor D.A. Nethercot