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Handling with the function is analogous to Checking of limit strain. The values offered for display are naturally different.
The calculation of crack width is performed ONLY for the axial force and bending moment My. In addition, the moment My must be in the plane of symmetry of the cross-section.
If either of the two conditions is not met, the program issues a corresponding warning.
The calculation of crack width assumes that the load which the cross-section is subjected to is acting in the XZ-plane (in the local coordinate system) of the beam. The load is assumed to be composed of one bending moment about the local Y-axis of the beam. The analysed section, however, is subjected to two bending moments.
The calculation of crack width assumes that the load which the cross-section is subjected to is acting in the XZ-plane (in the local coordinate system) of the beam. The resultant strain-plane is inclined from the XZ-plane of the bending moment, probably due to asymmetry in reinforcement, due to an opening, etc.
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w |
Crack width |
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As |
Required reinforcement area with respect to crack formation |
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max. distance |
Max. distance of reinforcement bars |
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max. diameter |
Max. diameter of reinforcement bars |
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Sigma p 0 |
Decompression stress |
Note: This calculation can be used only for SLS combinations.
For the procedure read Performing crack control.