# Wiki source code of Shrinkage (Load)

1 (% class="wikigeneratedid" id="HShrinkageStrain" %)
2 Free shrinkage strain behavior can be modeled as a load effect in reinforced concrete design and check.
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4 Shrinkage effect is calculated as a specific rotation. The following formulas give the example of calculation for reinforced concrete slabs:
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6 (% style="width:923px" %)
7 |(% colspan="2" style="width:920px" %)(((
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11 The specific normal force causing the given shrinkage value (ε,,cs,, [‰]) in the concrete zone of the section is (here in X direction).
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13 |[[image:https://wiki.fem-design.strusoft.com/xwiki/wiki/femdesignwiki/download/Manuals/User%20Manual/Loads/WebHome/1583243603354-802.png||alt="1583243603354-802.png"]]|(% style="width:806px" %)The position change of centre of gravity considering reinforcement bars (here X-direction; see dashed line), where [[image:https://wiki.fem-design.strusoft.com/xwiki/wiki/femdesignwiki/download/Manuals/User%20Manual/Loads/WebHome/1584536267263-190.png||alt="1584536267263-190.png"]] and //S,,s,,// is the statical moment of (here) X-directional bars around the Y axis of the calculation plane.
14 |[[image:https://wiki.fem-design.strusoft.com/xwiki/wiki/femdesignwiki/download/Manuals/User%20Manual/Loads/WebHome/1583243608703-727.png||alt="1583243608703-727.png"]]|(% style="width:806px" %)The moment around the Y axis of the calculation plane from //N,,x,,// because of the position change of centre of gravity.
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17 **Definition steps**
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19 1. Set the shrinkage strain (ε,,cs,,) value at the material properties of concrete structural elements.