GGU-UNDERPIN: Analysis to EC 2/DIN 1045-1

The following verification is required to EC 2/DIN 1045-1:

NR,d = - (b · h · fm,d · )

where

= 1.14 (1-2etot/h) - 0.02 l0/h

and

0 ≤ ≤ 1-2etot/h

Where:

NR,d = design value of the acceptable longitudinal force;

b = width of section;

h = thickness of section;

f m,d = design value of concrete compressive strength

= coefficient for considering the second order theory effects on the bearing capacity of compression members of unreinforced concrete in immovably braced structures;

etot = total eccentricity = e0 + ea + e

e0 = load eccentricity according to first order theory, where necessary taking the actions from adjoining floors into consideration (e.g. bending moments as a result of fixity, transferred from a slab to the wall), as well as the horizontal actions of wind ea, and the additional unintentional eccentricity as a result of geometric imperfections. If more precise data is not available, ea may be assumed at = 0.5 l0/200.

= eccentricity resulting from creep; generally, the e component can be disregarded.

Eccentricity limit

GGU-UNDERPIN only carries out the verification as long as the load eccentricity in the concrete section does not exceed 0.3 · b(concrete):

e(concrete) ≤ 0.3 · b(concrete)

If the eccentricity is larger, the coefficient is not calculated with the formula above but set to 0. The resistance Vr is then 0 and the degree of utilisation µ = 999.999: the verification is not satisfied at this depth. A hand calculation using the formula yields a value greater than 0 in this case and therefore differs from the program result.

The printout states this limit, marked with (*), in the header of the verification. Rows in which it applies are marked with (*) as well (from version 10.2).