# RF-CONCRETE Surfaces – Online Manual Version 5

Online manuals, introductory examples, tutorials, and other documentation.

# 2.7.10.6 Shrinkage influence

#### Shrinkage influence

The influence of shrinkage is directly introduced in the calculation with the defined value of the free shrinkage εsh. Thus, the influence of structural restraints or redistributions of the shrinkage forces is not taken into account.

In our example, the shrinkage strain is applied with the following value:

The free shrinkage strain causes additional forces in the cross-section:

The forces act for both crack states c (cracked and uncracked) with the eccentricity to the centroid of the ideal cross-section:

• uncracked state:

• cracked state:

The bending moment caused by the axial force nsh,φ1 for both states c is:

• uncracked state:

• cracked state:

When determining the coefficient ksh,c,d for both states c, we have to distinguish:

• for mφ1 ≠ 0:

• for mφ1 = 0:

In this example: mφ1 ≠ 0

• uncracked state:

• cracked state: