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Concrete Design: Anchorage & Laps

This document provides definitions and requirements for bond conditions, anchorage lengths, and lap lengths of reinforcing bars in concrete structures. It includes a table of anchorage and lap lengths as multiples of bar diameter for high-bond reinforcing bars with yield strengths of 460N/mm2 under different concrete strengths. Notes provide additional specifications for adjusting lengths based on yield strength, bond quality, bar diameter, and bar spacing. Diagrams illustrate definitions of bond conditions and required anchorage lengths.

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Bertin Bakari
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84 views2 pages

Concrete Design: Anchorage & Laps

This document provides definitions and requirements for bond conditions, anchorage lengths, and lap lengths of reinforcing bars in concrete structures. It includes a table of anchorage and lap lengths as multiples of bar diameter for high-bond reinforcing bars with yield strengths of 460N/mm2 under different concrete strengths. Notes provide additional specifications for adjusting lengths based on yield strength, bond quality, bar diameter, and bar spacing. Diagrams illustrate definitions of bond conditions and required anchorage lengths.

Uploaded by

Bertin Bakari
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Fig. 5.

24 Definition of bond conditions

Fig. 5.25 Required anchorage length

IStructE EC2 (Concrete) Design Manual 81


Fig. 5.26 Adjacent laps

Table 5.33 Anchorage and lap lengths as multiples of bar diameter – high bond
bars ƒyk = 460N/mm2
Concrete strength, 20 25 30 35 40
ƒck, N/mm2
Anchorage – straight bars 44 37 34 30 27
compression and tension lbnet
Anchorage – curved 31 26 24 21 19
bars [5] tension lbnet
Laps – compression – tension [6] 44 37 34 30 27
Laps – tension [7] 62 52 48 42 38
Laps – tension [8] 88 74 68 60 54
Notes to Table 5.33
General
1. For bars with ƒyk other than 460N/mm2, the Table values should be multiplied by (ƒyk/460).
2. The values in the Table apply to good bond conditions (see Fig. 5.24) where the bar diameter 32mm.
3. For poor bond conditions (see Fig. 5.24) the Table values should be divided by 0.7.
4. For bar diameter > 32mm the values should be divided by [(132 – )/100], where is the bar diameter in
mm for anchorage in compression zones.
Specific conditions
5. See Figs. 5.25(b), (c) and (d). In the anchorage region cover perpendicular to the plan of curvature should
be at least 3 .
6. Percentage of bars lapped at the section < 30% and clear spacing between bars 10 and side cover to
outer bar 5 .
7. Percentage of bars lapped at the section < 30% and clear spacing between bars < 10 or side cover to the
outer bar < 5 .
8. Percentage of bars lapped at the section <30 % and clear spacing between bars < 10 or side cover to the
outer bar < 5 .

82 IStructE EC2 (Concrete) Design Manual

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