Project 2

Aim: To Model of a member roof with cables. The modeling, form-finding and create the cutting patterns to the structure.

Procedure:

1. Create a new project and form finding and cutting pattern options
2. Create the nodes for the membrane Structure
3. Connect the lines to the nodes
4. Assign the material as cable to the lines
5. Select the nodes and assign hinge support
6. Assign the surface to the cable boundaries and create a new material for the membrane as orthotropic elastic 2D type
7. In the Form finding dilog give pre stress force of 1KN/m
8. Material properties of the surface
9. Go generate cutting pattern from cells option from tools and generate the cutting pattern
10. Geneate load cases as self-weight imposed load
11. Apply Imposed load of 0.25KN/m^2 on the membrane surface
12. Go to RF- LMITS module from data frop list and choose the results combination from design limit check
13. Provide axial froce ranges for all the surface in both nx and ny directions
14. Generate the mesh with 1m triangle meshing

Results:

• Deflection

Warp Axial force in membrane

Weft Axial Force in membrane

Principal Stresses

Cable Axial Force

Tick the compensation,compensation for boundaty line, allowance and kine type

Provide 1% allowance in warp direction and 3% allowance in weft direction

Check the cutting pattern for membrane:

Conclusion: Model of a membrane roof with cables. The modelling, form-finding and create the cutting patterns to the structure are done.