Page 98 - 6748
P. 98
6 7 8 9 10
e ►10.2 Complete the following sentences from the talk using the forces in Exercise 4c.
Listen again and check your answers.
So that downward force means the structure is in compression , especially near the bottom.
... a horizontal load, exerted by air against one side of the structure.
Because the structure is fixed at ground level, and free at the top, that generates
forces.
... when elements bend, you have opposing forces: at one side,
at the other.
...the wind effectively tries to slide the structure along the ground, and the
foundations below the ground resist that. The result of that is
force...
...the foundations need to rely on with the ground to resist the
pull-out force, ...
The action of the wind can also generate You get a twisting
force ...
When concrete absorbs heat from the sun, you get ; as soon as the
sun goes in, there’s .
f You and your partner specialise in designing structures for electrical transmission grids.
You are currently working on a cable support concept for power lines near wind farms
exposed to severe weather. You have come up with the following design. In pairs, hold a
short meeting to evaluate your design concept. Explain the forces acting on the structure.
96
