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Web crushing in EN 1992

The web crushing rules in EN 1992 are investigated by comparison with tests. Although they give significant increases compared with past practice, they appear to be largely valid within the range of tests. There are, however, some very marginal values and some slightly below the safe ratio of tests to predictions of 1.0. These are all for cases where the 80% yield rule governs. It is therefore recommended that this is made slightly more conservative. The rules allow greater web crushing stress with inclined links. With links at 45° the maximum force is doubled and can be as much as 3.5 times that allowed by BS 5400 Part 4. The rules also allow the full web crushing stress irrespective of slenderness. There do not appear to be tests to justify these large stresses. Further testing is recommended and suggestions for restrictions on shear stresses in slender webs and with inclined links are proposed for the interim. The proposals from the work modifying the rules for web crushing have been adopted in the National Annex to Parts 1 and 2 of EN 1992. Paul Jackson BSc, PhD, CEng, FIStructE, MICE Technical Director, Gifford Stephen W. Salim BEng (Hons), PhD Scott Wilson, ex-Gifford