Roofs & Pylons; Types of Structures & Forces

How can you make a roof withstand the forces acting

on it?

• It is important to try to make the frame structures strong.

• We have to choose the best builders.

• We have to use things like wood and bricks.

• We have to use pillars to support the roof.

Forces can act in the following ways on structures or

parts of structures

• Use of bricks

• • tension,

  • torsion,

  • compression,

  • shear, and

  • bending.

• Supporting structures like poles.

• Breaking down

Find strength in shape means:

• Finding new ways of creating supporting structures.

• Building structures in shape figures from materials such as wood as a supporting structure i.e. triangulation.

• Using plastic shapes to build a supporting structure.

• Using old toy blocks as a supporting structure.

What do we call the action/movement in this picture?

• Sqeezing

• Draining

• Clearing

• Twisting

A twisting force put on the structure as seen in the picture will break it. Adding the extra two red legs as seen in the bottom picture prevents the force from twisting and breaking the structure. What do we call this method of prevention?

• Supporting structure.

• External cross-bracing.

• Internal cross-bracing.

• Alignment.