10B. DIMENSIONING PART 2/4

CHAPTER 10B 'DIMENSIONING' 13 1.2.2.3 How to calculate the anchorage lengths lbd The method of calculating the lbd anchorage lengths for the different regulations is summarised below: The total lbd is calculated and this is divided into l1 and l2. The l1 is the straight anchor length and l2 is the one that turns inside the node. OBSERVATIONS: • The ECOS prescribes a minimum WIDE anchorage length (l1) which it calls lb,min. • EC2 does not provide for a minimum straight anchorage length, but provides for a minimum TOTAL anchorage length (l1+l2) which it also calls lb,min. • EC8 in paragraph 5.6.2, among other things, provides that ONLY for DCH the anchorage length should be only straight (extra long). On the basis of the above, the following conclusions can be drawn • For the EAK-EKOS scenario the minimum linear anchor length is exactly as specified and if it is greater than the width of the support minus the overlap, an error message is displayed • For the EC2 w/o EC8 scenario as well as for all ECs with DCL and DCM flexibility classes, it does not obey a minimum straight anchorage length of lb, min but the total length lbd is checked against lb, min according to 8.4.4 of EC2. So no error message will ever be displayed here because in case the anchor length is greater than the width of the support minus the overlap, the iron will reach up to the cheek and then turn at the node. • For EC with high DCH plasticity class, obey the minimum straight anchorage length according to EC8 5.6.2 (as in ECOS). The error message shall be displayed accordingly as in case 1 of ECOS. • In addition, the relevance regions are now taken into account for calculation of lb. The upper reinforcement is area II while the lower one is area I.