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Mr. R. A. D. Noble: ‘In their paper Bobrowski and Bardhan-Roy put forward a simple empirical method for calculating the ultimate strength of reinforced and prestressed concrete beams in combined flexure and shear which applies equally to rectangular and I sections. The treatment of the test results in this paper leads me to the conclusion that the actual thickness of the web in prestressed I beams does not play such a significant part in determining the actual ultimate strength in combined flexure and shear as it would appear to do either in existing design practice based on principal tensile stresses, or in new proposals for the Unified Concrete Code. It is of particular interest that some of the data is taken from tests at elevated temperatures under exposure to fire, since recent proposals by the FIP, which are likely to be adopted in this country, recommend limitations to the thickness and slenderness of webs in this context. In view of the material presented in this paper it seems to me that these proposals might be unnecessarily restrictive.
As is customary at the first Ordinary Meeting of the New Year, the meeting of the Institution at 6 o’clock on Thursday 8 January 1970 will take the form of an open discussion. This year’s theme is the economic consequences of substantial claims-a subject of importance to all engineers and indeed to all in the construction industry. All members are invited to bring to the meeting, colleagues from the contracting industry from whom contributions to the discussion will be most welcome.
Some cases where incorrect design of beams supporting two-way slabs may result from the use of only the triangular and trapezoidal load distributions which follow the shape of the segments of the panel collapse mechanisms are described and discussed.