PolyStringer solves complex stringer models based on the optimal plastic solution. It’s used for designing concrete diaphragms and stabilizing shear walls.
Building a stringer model
The first step is to model the geometry. Do this by adding, removing, and adjusting the distance between stringers. Use the mouse to create openings and removed undesired stringers.
Two different types of supports are available.
- Point support – absorbs the force in the node.
- Stringer support – absorbs the force along the stringer.
When modeling diaphragms, use stringer supports to represent reactions from stabilizing walls. Assign reaction values to ensure the desired horizontal load transfer. Leave three unassigned to maintain equilibrium. These unassigned supports act as control points for validation.
Create the desired load combinations and apply loads. Two different types of loads are available.
- Point loads – Concentrated force acting at a node.
- Stringer loads – Uniform load along a stringer.
Use stringer loads to represent walls that transfer a load to the diaphragm. A tool for converting uniform loads into point loads is available in the menu bar under “Tools”.
Solution
PolyStringer calculates the optimal plastic solution for the stringer model. After the calculation, you can view the reactions, shear forces, and stringer forces. If the shear force is too high, plastic redistribution can adjust the solution. This is useful when diaphragms exceed the capacity of hollow-core slabs.
The reinforcement module determines the required reinforcement based on internal forces.
Documentation
Once the stringer model is complete and the calculation looks good, you can generate a PDF report. Go to “Files”, click “Export PDF”, and choose a layout, or stick with the default settings.
Tip: For large models, adjusting the image size can improve readability in the PDF.
Try PolyStringer
Download a free trial and try PolyStringer today.