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| the action of one body on another that affects the state of motion or rest of the body |
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| the change in the structural qualities of a unit |
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| due to inertia or momentum of the mass of the structure |
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| determined through elasticity + ductility |
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| static, fixed loads that include building structure weight |
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| transient and moving loads that include occupancy loads |
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| principle of transmissibility |
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| the external effects on a body remain unchanged when a force acting is replaced by another force of equal magnitude at another point provided that both forces have the same sense and line of action |
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| a body of matter that theoretically undergoes no deformation |
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| acts on the external to resist the force |
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| all forces acting along same straight line |
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| all forces acting in the same plane |
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| coplanar, parallel (force system) |
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| all forces are parallel and acting in the same plane |
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| coplanar, concurrent (force system) |
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| all forces intersect at a common point and lie in the same plane |
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| non coplanar, parallel (force system) |
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| all forces are parallel but don't lie in the same plane |
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| non coplanar, concurrent (force system) |
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| all forces intersect at a common point but aren't on the same plane |
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| non coplanar, nonconcurrent |
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| easy stuff with sin cos yeahhhh |
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| rotation of a body about some reference axis or point |
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| a set of forces equal in magnitude opposite in direction |
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| the moment is simply the force multiplied by the perpendicular distance from the point of action Ma = Fxd |
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| # of unknowns = # of equations of equilibrium |
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| # of unknowns is greater than # of equations of equilibrium |
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| suspension bridges, roof structures, transmission lines |
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| fluttering when acted upon by wind forces |
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| a perfectly flexible cable or string |
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| the natural funicular shape the cable takes on when it isn't loaded |
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| load or force centered on one specific point |
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| uniformly distributed load |
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| non uniformly distributed load |
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| a structural system that distributes loads to supports through a linear arrangement of various sized members in patterns of planar triangles |
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| six assumptions when analyzing trusses |
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| [1] members are linear [2] members are pin-connected at the ends [3] the weight of truss memebrs is usually neglected [4] loads are applied to the truss at the pinned joints only [5] secondary stress is neglected at the joints [6] each member of the truss may be treated as a two-force member |
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| assumed to have their loads applied only at the end pin or hinge; the resultant force in the member must be along the axis of the member |
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| must follow 2 conditions (no force acting on point, two of the tree beams have the same slope) |
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| diagonal tension counters |
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| if one is in tension, the other is in compression |
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| a member acted upon by three or more forces, these forces are generally not directed along the members axis, thus, the resultant member force direction is unknown |
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| forces which tend to flatten out the arches |
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| statically determinate systems and will be the only contemporary arch type studied |
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| a single point at which the weight could be held and be in balance in all directions |
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| ignores weight and considers only volume is the center of whatever structure you may have |
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| mathematical expression used in the study of the strength of beams and columns |
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| the moment of inertia of an area with respect to any axis not through the centroid is equal to the moment of inertia of that area with respect to its own parallel centroid axis plus the product of the area and the square of the distance between the two axes |
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| expresses the relationship between the area of a cross section and a centroidal moment of inertia, it is a shape factor that measures a column's resistance to buckling |
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| based on change in dimensions |
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| perpendicular to the face of the material |
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| parallel or tangential to the force of the material |
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