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Excerpt of the most important variables for an anchor design with DesignFiX.

These terms we use in our DesignFiX documentation.

1a3Increase of the lever arm of a shear load due to spalling of the concrete surface during drilling
4A°c,NBase area of the idealized failure body of a single anchor not influenced by adjacent anchors or component edges for conical concrete break-out and splitting under tension load
5A c,NBase area of the idealized failure body of a fastening for conical concrete break-out and splitting under tension load
6A° c,VBase area of the idealized failure body of a single anchor not influenced by adjacent anchors or further component edges for concrete edge failure under shear load
7A c,VBase area of the idealized failure body of a fastening for concrete edge failure under shear load
8A° p,NBase area of the idealized failure body of a single anchor not influenced by adjacent anchors or component edges for combined pull-out and concrete failure (chemical anchors) under tension load
9A p,NBase area of the idealized failure body of a fastening for combined pull-out and concrete failure (chemical anchors) under tension load
10c, c 1 , c 2 ,
c 2,1 , c 2,2
Edge distances
11c cr,NCharacteristic edge distance for conical concrete break-out under tension load
12c cr,NpCharacteristic edge distance for combined pull-out and concrete failure (chemical anchors) under tension load
13c cr,spCharacteristic edge distance for splitting of the component under tension load
14c cr,VCharacteristic edge distance for concrete edge failure under shear load
15c minMinimum permissible edge distance
16dDiameter of anchor bolt or thread diameter; anchors with internal thread: outer diameter of the bolt
17d fDiameter of the hole in the base plate or fixture
18d nomOutside diameter of the anchor
19e 1Distance between the shear load and the surface of the concrete for shear load with lever arm
20E cModulus of elasticity of concrete
21E dValue of design action
22e N
e N,1 , e N,2
Eccentricity of the resultant of the tension-loaded anchors with respect to the centre of gravity of these anchors
23e VEccentricity of the resultant of the shear-loaded anchors close to an edge with respect to the centre of gravity of these anchors for concrete edge failure
24f ck,cubeConcrete compressive strength for cubes with a side length of 150 mm
25hComponent thickness
26h efEmbedment depth of an anchor
27h‘ efModified embedment depth of an anchor for the special case „three or four edges“ under tension load
28h minMinimum permissible component thickness
29I pRadial moment of inertia
30ILever arm of a shear load
31l fEffective anchor length
32M EdDesign value of the acting bending moment
33M Ed,xDesign value of the acting bending moment Mx
34M Ed,yDesign value of the acting bending moment My
35nNumber of anchors in a group
36N EdDesign value of the acting tension load
37N hEdDesign value of the tension load acting on the highest loaded anchor of a group
38N gEdDesign value of the acting tension load of a group
39N Rd,sDesign value of the characteristic resistance for steel failure under tension load
40N Rd,pDesign value of the characteristic resistance for pull-out/pull-through (mechanical anchors) under tension load
41N Rd,cDesign value of the characteristic resistance for conical concrete break-out under tension load
40N Rd,spDesign value of the characteristic resistance for splitting under tension load
42N° Rk,cCharacteristic resistance of a single anchor not influenced by adjacent anchors and component edges for conical concrete break-out under tension load
43N Rk,cCharacteristic resistance of a fastening for conical concrete break-out under tension load
44N° Rk,pCharacteristic resistance of a single anchor not influenced by adjacent anchors and component edges for combined pull-out and concrete failure (chemical anchors) under tension load
45N Rk,pCharacteristic resistance of a fastening for pull-out/pull-through (mechanical anchors) and combined pull-out and concrete failure (chemical anchors) under tension load
46N Rk,sCharacteristic resistance for steel failure under tension load
47N Rk,spCharacteristic resistance for splitting under tension load
48R dValue of the design resistance
49R kCharacteristic resistance
50s, s1, s2,
s1,1, s1,2,
s2,1, s2,2
Axial spacing of anchors
51s cr,NCharacteristic axial spacing for conical concrete break-out under tension load
52s cr,NpCharacteristic axial spacing for combined pull-out and concrete failure (chemical anchors) under tension load
53s cr,spCharacteristic axial spacing for splitting under tension load
54s cr,VCharacteristic axial spacing for concrete edge failure under shear load
55s minMinimum permissible axial spacing
56S
57V EdDesign value of the acting shear load V
58V hEdDesign value of the shear load acting on the highest loaded anchor of a group
59V gEdDesign value of the shear load acting on a group
60V Ed,hHorizontal component of the acting shear load
61V Ed,vVertical component of the acting shear load
62V Rd,cDesign value of the resistance for concrete edge failure under shear load
63V Rd,cpDesign value of the resistance for pry-out failure under shear load
64V Rd,sDesign value of the resistance for steel failure under shear load
65V° Rk,cCharacteristic resistance of a single anchor not influenced by adjacent anchors, further component edges and the component thickness for concrete edge failure under shear load
66V Rk,cCharacteristic resistance of a fastening for concrete edge failure under shear load
67V Rk,cpCharacteristic resistance of a fastening for pry-out failure under shear load
68V Rk,sCharacteristic resistance for steel failure under shear load
69α gap
70α MRestraint of the anchor at the side of the base plate or fixture
71α seis
72α VAngle between the acting shear load and a line perpendicular to the edge
73β NRatio between the design action and the design resistance for tension load
74β VRatio between the design action and the design resistance for shear load
75γ MPartial safety factor for the material
76γ McPartial safety factor for conical concrete break-out
77γ MpPartial safety factor for pull-out/pull-through (mechanical anchors) and combined pull-out and concrete failure (chemical anchors)
78γ MsPartial safety factor for steel failure
79γ MspPartial safety factor for splitting failure
80τ RkCharacteristic bond strength of a chemical anchor
81τ Rk,ucrCharacteristic bond strength of a chemical anchor in non-cracked concrete
82Ψ α ,VFactor to consider the effect of the load direction for concrete edge failure under shear load
83Ψ ec,NFactor to consider the effect of the load eccentricity for conical concrete break-out and splitting under tension load
84Ψ ec,NpFactor to consider the effect of the load eccentricity for combined pull-out and concrete failure (chemical anchors) under tension load
85Ψ ec,VFactor to consider the effect of the load eccentricity for concrete edge failure under shear load
86Ψ g,NpFactor to consider the effect of small axial spacing for combined pull-out and concrete failure (chemical anchors) under tension load
87Ψ h,NFactor to consider the effect of the component thickness for splitting failure under tension load
88Ψ h,VFactor to consider the effect of the component thickness for concrete edge failure under shear load
89Ψ re,NFactor to consider the effect of a dense surface reinforcement for conical concrete break-out and splitting failure under tension load
90Ψ re,NpFactor to consider the effect of a dense surface reinforcement for combined pull-out and concrete failure (chemical anchors) under tension load
91Ψ re,VFactor to consider the effect of the position of the anchor and of an edge reinforcement for concrete edge failure under shear load
92Ψ s,NFactor to consider the effect of an edge on the stress distribution in the concrete for conical concrete break-out and splitting failure under tension load
93Ψ s,NpFactor to consider the effect of an edge on the stress distribution in the concrete for combined pull-out and concrete failure (chemical anchors) under tension load
94Ψ s,VFactor to consider the effect of further edges on the stress distribution in the concrete for concrete edge failure under shear load