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Verulam

Flatness and tolerances in HSFG bolted connections We have received several replies to the concerns expressed by Mr J. Renshaw (19 March) regarding the effects of lack of flatness and any resulting gaps in HSFG bolted connections. Dr. A.P. Mann of Sale, joint author with Dr. L. J. Morrisof CIRIA Report 87 (which is concerned with this problem), was mentioned by Mr Renshaw. He has written to us with comments as follows: As explained in the CIRIA report, the significance of gaps between the plies of HSFG bolted joints really depends on a large number of factors. An engineer’s first option, before being concerned at the existence of gaps, should be to question why HSFG bolts are being used at all: in the case sited by Mr Renshaw of a simple beam-to-column joint transmitting shear, the use of grade 8.8 bolts would seem to be an acceptable substitute, so eliminating the presumed problem at a stroke. Verulam