Presentation on theme: "By Jaime R. Rico. Are these structures? So, what is a structure? Something that protects someone or something Something that supports s.o. or s.t. Something."— Presentation transcript:
by Jaime R. Rico
Are these structures?
So, what is a structure? Something that protects someone or something Something that supports s.o. or s.t. Something that contains s.o. or s.t Something that…
Some concepts A force is a push or pull that tends to cause an object to change its movement or shape A load is an external force which acts on a structure. (e.g. weight) An stress is an internal force which acts on a structure.
DEFINITION OF STRUCTURE A structure is an arrangement of elements that resists loads. A structure is an element or a set (group) of elements that withstand (support) loads without breaking or distorting (disforming) excessively (too much).
What does it mean to withstand a load? Structures withstand loads if they can support all the forces acting on them without collapsing or breaking.
TYPES OF LOADS Remember that a load is an external force which acts on a structure. Loads are classified in: Static (or Death) load: is a permanent force, acting on a structure. This includes the weight of the structure itself and the non- moving parts it supports. Dynamic (or Live) load: is a changing, or non-permanent force acting on a structure. This includes the force of the wind and the weight of things that are in, or on a structure.
TYPES OF STRUCTURES We can classified them attending to their origin. Natural structures: exist in the Nature. Manufactured structures: are built by people.
NATURAL STRUCTURES Are not made by people. Occur naturally in the environment. Examples: Skeleton Nest Egg shell
MANUFACTURED STRUCTURES Are built by people. Are classified in: Mass structures Frame structures Shell structures
MASS STRUCTURES Are made piling up material Examples: Pyramid Dam Wall Castle
FRAME STRUCTURES Are made from bars joined together to form a 'framework‘ Most of the inside part of the structure is empty space Are the most common construction choice. Why?
SHELL STRUCTURES Use a thin, carefully shaped, outer layer of material, to provide their strength and rigidity The shape of a shell structure spreads forces throughout the whole structure Every part of the structure supports only a small part of the load, giving it its strength.