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Powerpointjuju
1.
STRUCTURES Structures are
groups of elements somehow joined together to support a load with stability.
2.
3.
Shell structures
4.
Archs
5.
Mass structures
6.
Suspension structures
7.
8.
They are composed
of long elements which are joined to each other at the ends.
9.
Elements are built
with strong materials and the space between them is empty space.
10.
They are easy
to desing and build, inexpensive, lightweight and they don't require much materials.
11.
However they are
not goodfor very big loads or strong impacts.
12.
13.
14.
That volume can
be empty or filled with something that has not structural relevance.
15.
It mantains the
shape and it's strong.
16.
The cut layer
can be thin because the forces are spread throughout the whole structure.
17.
18.
19.
Althought there are
many types the semicircular arch is the most used.
20.
They are made
of stone and the stone at the very top is called the “key stone”.
21.
They are used
like bridges, the key is that the geometry of the arch spreads the forces to the sides leaving a space under the arch.
22.
23.
24.
Mass structures can
be made by piling up materials into a shape or desing.
25.
They have some
advantages its held by its own weight and losing small parts has little effect on the overall strength of the structure.
26.
However they also
have disadvantages, they are heavy, need much material and occupy large areas.
27.
28.
29.
The space between
one column and the next is called span.
30.
They are the
best for bridges.
31.
They are good
for covering a very large span.
32.
However they are
very expensive to build.
33.
34.
Local structures
35.
International sructures
36.
37.
In a structure
the forces for every elements are calculated and the element is desingned to whithstand the force
38.
39.
The whole structure
is often united to the floor
40.
The union are
classified as permanent and non-permanent
41.
42.
43.
44.
There are five
tipes of forces:
45.
46.
Compression forces:
They are those forces which causes an element to get squeezed.
47.
Shear strain:
Shear forces act across a material in such way that they can force one part of an element to slide over another.
48.
Torsion forces:
If you apply turning force at one end of an element and, if the element is fixed to a support at the other end, the element twist.
49.
Bending forces:
Bending forces act at an angle to a member making it bend
50.
BY: Paola Caro
Domínguez & Maria Alejo Hernández
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