To assess a structure (whether it is sufficiant or not), the following steps must be followed in sequence:
- Schematising the construction
- Determining the internal forces and moments (= global analysis)
- Checking the cross-sections (= design):
The explanation below covers the design of timber.
- Calculate the internal forces (syn. global analysis) F9 or .
Check the option to take the creep into account.
- Set the buckling lengths.
Don’t skip this step! Without the correct buckling lengths the stability results have no meaning.
- Select the correct timber standard with Analysis > Timber standard.
- Click on F3 or to start the verification.
- View the results with. For the results of the strength check click, for those of the stability check click.
The results of the strength and stability check are displayed as a percentage of the total capacity (= 100%) of the section.
- A structure is sufficient for strength, if the percentage is less than 100% for all bars.
- A structure is sufficient for stability, if the percentage is less than 100% for all bars.
Based on the percentage no judgment can be made on the extent to which a section is sufficient or not. This is because the used formulas are not always linear.
- Don’t forget to verify the stiffness, thus the deformation.
A structure is sufficient if the strength, stability and stiffness are sufficient.