Project 2

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

Aim:

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

Procedure:

• Create a new project and enable form finding and cutting pattern options

Create the nodes for the membrane structure

Connect the lines to the nodes

Assign the materail as cable to the lines

Select the nodes and assign hinge support

Assign the surfaces to the cable boundaries and create a new material for the membrane as orthotropic elastic 2D type

In the Form finding dialog give pre stress force of 1 KN/m

Material properties of the surface

Go generate cutting pattern from cells option from tools and generate the cutting pattern

Generate load cases as self-weight and imposed load

Apply lmposed load of 0.25 KN/m^2 on the membrane surface

Go to RF-LIMITS module from data drop down list and choose the results combination from design limit check

Provide axial force ranges for all the surfaces in both nx and ny directions

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 boundary line, allowances and line type

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

Check the cutting pattern for membrane :

Result:

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