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# Anchorage of longitudinal reinforcement: the design anchorage length lbd

## Eurocode 2 part 1-1: Design of concrete structures \$(document).ready(function () { var freeExample = \$("#freeExample").length; \$("#mainMenu li#nav-appCate, #mainMenu li#nav-appEC211").addClass("active"); var proUser = false === true || false === true || freeExample !== 0; if (!proUser) { \$('#Input input').keyup(function(){ \$('#AlertSubscribe').modal(); }); \$('#Input select').change(function(){ \$('#AlertSubscribe').modal(); }); }; var tempInput = \$("#tempInput").text(); if (tempInput != "") { \$("#Input").parent("form").deserialize(tempInput); if (proUser) { \$("#acceptBtn").trigger("click"); } }; });  8.4.4 (1)

The design anchorage length is:

 lbd = α1 α2 α3 α4 α5 lb,rqd  ≥ lb,min (8.4)

where:

α1 α2 α3 α4 α5 are given in Table 8.2
α1
is for the effect of the form of the bars assuming adequate cover
α2
is for the effect of concrete minimum cover
α3
is for the effect of confinement by transverse reinforcement
α4
is for the influence of one or more welded transverse bars (Φt ≥ 0,6Φ) along the design anchorage length lbd
α5
is for the effect of the pressure transverse to the plane of splitting along the design anchorage length lbd
 The product (α2 α3 α5) ≥ 0,7 (8.5)
lb,rqd
is the basic required anchorage length
lb,min
is the minimum anchorage length, if no other limitation is applied:
 • for anchorages in tension: lb,min ≥ max{0,3lb,rqd; 10Φ; 100 mm} (8.6) • for anchorages in compression: lb,min ≥ max{0,6lb,rqd; 10Φ; 100 mm} (8.7)

This application calculates the design anchorage length lbd from your inputs. Intermediate results will also be given.

First, change the following option if necessary:

Input
mm
mm

Output
α1
Table 8.2
α2
Table 8.2
α2 α3 α5
(8.5)
lb,min
mm (8.6)
the design anchorage length lbd
mm (8.4)