123. FREYSSINET C AND K SYSTEMS ANCHORAGES
PAGE 1/2
C System
123.23 Internal and external Prestressing (concrete cover and anchorage distances)
The minimum distances are recalled as follows:
• Grouping on several lines
a
o
: minimum distance between the axes of two anchorages
a
o
= A (or B)* + 30 mm (*depending on the orientation of the tromplates)
b
o
: minimum distance between the axis of an anchorage and the concrete face.
• Grouping on one line
This arrangement concerns for example, the ancho-
rages in the web of a beam or segment or ancho-
rages of transverse prestressing tendons in the upper
slab of a bridge.
b
oo
: minimum half-thickness of the wall
PPC
123/
23-
02.95
The following
must be verified:
a or/and a’
≥
a
o
, b or b’
≥
b
o
a’b or/and ab’
≥
1,6 b
2
o
aa’
≥
1,5 F
o
f
cmin
a
a
a
b
b
B
A
A
B
a’
a’
a’
b’
b’
The following must be verified:
b
≥
b
oo
b’
≥
1,5 b
oo
a’b
≥
F
o
f
cmin
2 b
b’
a’
Dimensions in mm
3 C 15
4 C 15
7 C 15
13 C 15
19 C 15
25 C 15
31 C 15
37 C 15
55 C 15
ao = A + 30
180
180
210
280
330
390
415
450
540
minimum
ao = B + 30
140
150
180
240
280
330
350
380
450
minimum
Units
fc min.
3 C 15
4 C 15
7 C 15
13 C 15
19 C 15
25 C 15
31 C 15
37 C 15
55 C 15
MPa
23
120
140
185
250
300
345
380
420
510
33
105
115
155
210
250
290
320
350
425
43
105
110
140
190
225
260
285
310
375
63
105
110
135
185
220
255
275
295
345
bo
mm
Units
fomin.
3 C 15
4 C 15
7 C 15
13 C 15
19 C 15
25 C 15
31 C 15
37 C 15
55 C 15
MPa
23
90
105
145
190
230
265
300
330
400
33
85
100
125
170
200
230
260
285
350
43
85
95
120
160
190
220
240
260
315
63
85
95
120
160
190
220
235
255
300
23
180
210
290
380
460
530
600
660
800
33
170
200
250
340
400
460
520
570
700
43
170
190
240
320
380
440
480
520
630
63
170
190
240
320
380
440
470
510
600
boo
mm
2 b
mm
123. FREYSSINET C AND K SYSTEMS ANCHORAGES
PAGE 2/2
K System
123.24 Internal and external Prestressing (concrete cover and anchorage distances)
a
o’
: minimum distance between the axes of two anchorages.
a
o
= I (or J)* + 30 mm (*depending on the orientation of the bearing plates - see § 112.32 to 112.33).
b
o
: minimum distance between the axis of an anchorage and the concrete face.
The minimum distances are recalled as follows:
Note: For concrete such as f
cmin
> 43 MPa, refer to the K system technical
guidebook, appendix 2, section 5.
• Lateral cover and distances between anchorage
axis. Grouping on one line.
b
oo
: minimum half-thickness of the wall.
Note: The asterisks indicate the lower limit for b
oo’
whatever the upper class of concrete used.
For concrete such as f
cmin
≥
38 MPa and providing special plates are being used, the above values of b
oo
can be reduced (refer to the K system technical guide-
book, appendix 2, section 5).
PPC
123/
23-
02.95
The following must be verified:
a or/and a’
≥
a
o
, b or/and b’
≥
b
o
a’b or/and ab’
≥
1,6 b
2
o
aa’
≥
1,5 F
o
f
cmin.
a
a
The following
must be verified:
b
≥
b
oo
b’
≥
1,5 b
oo
a’b
≥
F
o
f
cmin.
b
b’
a’
2 b
a’
b’
fc min
7 K 13
12 K 13
19 K 13
27 K 13
37 K 13
55 K 13
in MPa
4 K 15
7 K 15
12 K 15
19 K 15
27 K 15
37 K 15
23
155
205
255
305
365
435
28
145
190
240
285
340
405
33
140
180
225
270
325
385
38
130
170
215
260
310
370
43
125
165
210
250
300
355
bo
in
mm
fcmin
7 K 13
12 K 13
19 K 13
27 K 13
37 K 13
55 K 13
in MPa
4 K 15
7 K 15
12 K 15
19 K 15
27 K 15
37 K 15
23
130
170
210
250
300
355
28
120
155
195
235
280
335
33
115*
150*
185*
225
265*
315
38
115*
150*
185*
215*
265*
300*
43
115*
150*
185*
215*
265*
300*
23
260
340
420
500
600
710
28
240
310
390
470
560
670
33
230*
300*
370*
450
530*
630*
38
230*
300*
370*
430*
530*
600*
43
230*
300*
370*
430*
530*
600*
boo
in
mm
2 b
mm
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