Structures

STRUCTURES 2º ESO TECHNOLOGY DEPAR T MENT

STRUCTURES EVERYWHERE! ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

NATURAL STRUCTURES ,[object Object],A tree has to carry the weight of its own branches as well as resisting strong winds.

MANUFACTURED STRUCTURES ,[object Object],Many of Nature´s structures have been copied by humans. The shell of a snail and the body of a modern car are both shell structures designed to protect their occupants . When we think of manufactured structures we often think of examples such as bridges, electricity pylons and tall buildings, but some of the common structures are quite simple. Most objects resists loads, and most objects are also structures.

NATURAL OR MANUFACTURED? ,[object Object]

TYPES OF STRUCTURES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

MASS STRUCTURES ,[object Object]

FRAME STRUCTURES ,[object Object]

SHELL STRUCTURES ,[object Object],[object Object]

WHAT DO STRUCTURES DO? ,[object Object],[object Object],In short, all structures do one or more of these things: ,[object Object],[object Object],[object Object]

FORCES ACTING ON STRUCTURES ,[object Object],Forces can be: Static (stationary): Static forces are usually forces caused by the weight of the structure and anything which is permanently attached to it . Dynamic (moving): Dynamic forces are caused by things such as wind, waves, people, and vehicles.

FORCES ACTING ON STRUCTURES ,[object Object],[object Object],[object Object],[object Object],[object Object],Members of structures support external forces or LOADS that can act in different way. Forces can:

FORCES ACTING ON STRUCTURES ,[object Object],TENSION ( Tracción ) COMPRESSION ( Compresión ) SHEAR ( Corte o cizalladura ) TORSION ( Torsión ) BENDING ( Flexión)

FORCES ACTING ON STRUCTURES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

STRUCTURAL MEMBERS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

STRUCTURAL MEMBERS Beams ( vigas ): They have to resist bending. They are made from different sections easy to remember because they are named after their shapes. Girder ( jácena ): T he main horizontal support of a structure which supports smaller beams. They often have and I-shape for strength, but may also have a box shape, z shape or other forms.

www.technologystudent.com www.iesalquibla. com http://www.deyes.sefton.sch.uk/technology/Keystage3/structures.htm RESOURCES The information used was mainly extracted for the following web sites:

Structures

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