By Comitee Euro-International du Beton
Even supposing quite a few fastenings assembles are put in on a daily basis, figuring out within the engineering group in their behaviour is restricted, and there's no in general authorized layout strategy. layout of fastenings in concrete over comes this.
This layout consultant relies on a security inspiration utilizing partial defense elements taken from the CEB/FIB version Code 1990, and it covers all loading occasions and failure versions. it truly is legitimate for enlargement, undercut and headed anchors, and is appropriate to either new buildings and the fix and strengthening of current buildings
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The shear load taken by the individual anchors of a group may be different. Comment With a plastic design approach, the area of anchor steel may be reduced in comparison with an elastic design approach. However, the required anchorage depth and edge distance may be larger than for the elastic design approach, to preclude a concrete failure. 3. 4, respectively. 5. Non-cracked concrete Non-cracked concrete may be assumed in the design of anchorages if in each individual case it is shown that in the serviceability limit state the anchor with its entire anchorage depth is situated in non-cracked concrete.
4) Edge failure (Sect. 4) 1 Ultimate limit state of fatigue (Sect. 11) Serviceability limit state (Sect. mit $ l / ~ < *Vlim* Durability (Sect. 13) End Fig. 37. Flowchart B for the calculation of the resistance of post-installed expansion and undercut anchors (elastic design approach) 38 GENERAL Start Application criteria (Sect. 2) Steel resistance (Sect. 2) Find appropriate safety factor If combined tension and shear (Sect. 4) Shear (Sect. 3) Concrete resistance Steel resistance Concrete resistance Pull-out (Sect.
This agrees with test results and can be explained by fracture mechanics. (b) The factor ^ A , N = ^ C , N M C N takes into account the geometric effects of spacing and edge distance, where: A®N = area of concrete cone of an individual anchor with a large spacing and edge distance at the concrete surface, idealizing the concrete cone as a pyramid with a height equal to hei and base lengths equal to scrN (see Fig. 42) i4C|N = actual area of concrete cone of the anchorage at the concrete surface.