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Sir,-We welcome this paper by Dr. Wood because for the first time in an official publication the nonproportionality of the stanchion moments with the load, for increase of loads above the design loads, is recognised and the irrational basis of the theory published by the Steel Structures Research Committee is clearly demonstrated.
The method presented here is applicable only to portal frames with hinged base columns, but as about 80 per cent. of every-day portal design comes under this category, it must be agreed that this fact does not seriously affect its usefulness to the designer.
Mr I.P. Gillson (M) (Central Electricity Generating Board): I draw the attention of specifying engineers to the need to
-study carefully the September 1983 draft ‘Guidance notes’ when dealing with particularly vulnerable structures
-consider the relevance of tests on mortar prisms and cubes to the risk of ASR damage
-consider the scale effects of concrete samples on the risk of ASR damage
-examine evidence from concrete that has been damaged by ASR