A body is placed in a certain airstream

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An structure is a set of elements united with each other, supporting the forces acting on them. Force: Everything that can deform a body or modify.

Types of structures: Trianguled structure, Frame structure, Hanging structure, Masive structure, Laminan structure, Vaulted structure.
An effort it's an internal force that the elements of a structure when they are subjected to external forces: Tracfion effort, Compression effort, Bending effort, Torsion effort, Shear effort.
A load it's a heavy masswhich is supported and carried by something. Fixed load and variable loads
3 conditions: It must be rigid, stable andresistant. 

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