Considerng bond strength with anchorage resistance length and lapping length.

Gnoowij · Nov 20, 2023

Dear all,

There is two rebar in a row with lapping length, 100mm.

In case that I cannot follow the standard length of anchorage length and lapping length of rebars, can I consider the as the following?
(lapping length is considered as anchorage length)

Tension force = 300kN
Rebar
a) Dia : D20
b) fbd = 3Mpa
c) Anchorage length : 300mm
d) lapping length : 100mm
e) Total anchorage length = 400mm

=> F, (Rebar resist agaist tension) = fbd x L(300+100) x Perimetre of rebar = 377kN

Lomarandil · Nov 20, 2023

No, you cannot. Anchorage and lapping to embedded bars are not capacities that can be combined. You must develop enough capacity in one or the other.

In this case, your anchored bar will attempt to pass force into the D20 embedded bar. The lap length is not adequate to transfer that force, so the concrete between those two bars will locally overstress. After that, the anchored bar will attempt to pass the force into the concrete as a basic anchorage problem. The concrete will create a tension breakout cone (around 200kN).

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

Considerng bond strength with anchorage resistance length and lapping length.

Gnoowij

Civil/Environmental

Recommended for you

Lomarandil

Structural

Similar threads

Part and Inventory Search

Sponsor