ANALYSIS OF STATICALLY DETERMINATE STRUCTURES Flashcards
forces that develop
within every structure that keep the different
parts of the structure together
INTERNAL FORCES
actions of other
bodies on the structure under
consideration. For the purposes of
analysis, it is usually convenient to
further classify these forces as applied
forces and reaction forces.
EXTERNAL FORCES
it maintains its shape and
remains a rigid body when detached from
the supports.
INTERNALLY STABLE
it cannot maintain
its shape and may undergo large
displacements under small disturbances
when not supported externally.
INTERNALLY UNSTABLE
evaluates if there are
enough support reactions to prevent the
structure from moving as a rigid body.
EXTERNAL STABILITY
When the unknown forces can be computed using equilibrium equations
o A structure which has enough connections to be stable
STATICALLY DETERMINATE
When the number of unknown forces is more than the equilibrium
equations
o A structure which has more than enough connections to be stable
STATICALLY INDETERMINATE
the capability for a structure to recover equilibrium
STABILITY
one that will not collapse when disturbed.
STABLE STRUCTURE
generally cannot be analyzed
UNSTABLE STRUCTURE
structure is one that would maintain its shape if all the
reaction supports were removed
INTERNALLY STABLE
A structure that is internally unstable may
still be generally stable if it has
SUFFICIENT EXTERNAL SUPPORT REACTIONS
all of the external reaction
force components may be calculated using only static equilibrium
EXTERNALLY STATICALLY DETERMINATE STRUCTURE
A structure for which the external
reactions component forces cannot be calculated using only equilibrium
EXTERNALLY STATICALLY INDETERMINATE STRUCTURE
all of the external reaction
component forces and internal forces may be calculated using only static
equilibrium
INTERNALLY STATICALLY DETERMINATE STRUCTURE
