The Structural Engineer > Archive > Volume 12 (1934) > Issues > Issue 9 > Tables for Slabs Designed to Ministry of Transport Load and Stress Requirements
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Tables for Slabs Designed to Ministry of Transport Load and Stress Requirements

When the Roads Department of the Ministry of Transport published their Chart of "Equivalent Distributed Loads for Highway Bridges," they also issued a leaflet showing the permissible working stresses they were willing to allow for various qualities of reinforced concrete. The Loads Chart also made various provisions for bridge deckings constructed in concrete. In the table of stresses an increase was allowed of 25 per cent. over what had been previously allowed by Public Authorities previous to that date, September, 1933. It was evident that, if such higher stresses were recognised as safe for bridges, other Authorities could not maintain their old conservative limits much longer; recently the London County Council, pending the revision of their Regulations, have recognised (and accepted under their Waiver Clause) stresses of about the same intensity as those allowed by the Ministry of Transport. Since the Recommendations of the Reinforced Concrete Structures Committee of the Building Research Board have been published and the new standard for concrete stresses are thereby confirmed it is essential for designers to accustom themselves to the higher resistances of reinforced concrete members which they are now able to employ. Ernest A. Scott

Author(s): Scott, Ernest A

Keywords: tables;slabs;ministry of transport;reinforced concrete;design