St Flashcards
The equilibrium equations alone are sufficient for determining the support reactions and internal forces of indeterminate structures.
False
The compatibility conditions in structural analysis ensures that the deflections and rotation of all members meeting at a rigid joint are different.
False
The maximum stresses in statically indeterminate structures are generally lower than those in comparable determinate structures.
True
Statically indeterminate structures, if properly designed, have the capacity for redistributing loads when certain structural portions become overstressed or collapse in cases of overloads due to earthquakes.
True
The force methods are preferred for the analysis of large and highly redundant structures.
True
Im structural analysis, a ________ refers to an extra member or support that can-be removed without affecting the equilibrium of the structures.
Redundants
The ________ of a structure refers to its ability to resist overturning, sliding or collapsing under applied loads and forces
Structural stability
The method of consistent deformation, also known as the ________, is a structural analysis technique.
Force Method
what is a measure of its resistance to deformation in structures
Stiffness
To solve statically indeterminate structures, additional _____ or deformation methods are employed.
Method
When all forces in a structure can be determined from the equilibrium equation
STATICALLY DETERMINATE STRUCTURES
Structures having more unknown forces than available equilibrium equations.
STATICALLY INDETERMINATE STRUCTURES
Additional equations needed to solve for the unknown reactions
SI STRUCTURES
The additional support reactions on the beam or shaft that are not needed to keep it in stable equilibrium are called
Redundants
Referred to as degree of indeterminacy
No of Redundants
The max stresses in SI structures are generally lower than those in comparable determinate structures
Smaller stresses
SI structures generally have higher stiffnesses than those of comparable determinate structures.
Greater stiffnesses
A system is said to be ____ if the support reactions and the internal forces cannot be determined using statics alone.
Indeterminate
Consists of more members and more supports
Indeterminate structures
Support settlements do not cause any stresses in determinate structures, they may, however, induce significant stresses in independence structures, which should be taken into account when designing IS.
Stresses due to support settlements
Like support settlements, these effects do not cause stresses in determinate structures but may induce significant stresses in indeterminate ones.
Stresses due to temperature changes and fabrication errors
Most of the structures designed today are SI.
True
RC buildings are considered in most cases a statically indeterminate structures since the columns beams are considered as continuous member through the joints over the support.
True
Are generally convenient for analyzing small structures with few redundant.
Force methods
More systematic, can be easily implemented on computers, preferred for the analysis of large and highly redundant structures.
Displacement Methods
If the support reactions are concurrent( intersect at a single point) thenthe truss is
Externally stable
If the support reactions are paralled, then the truss is
Externally unstable
Introduced by James C Maxwell
CDM
In this methods, the unknowns are the redundant forces.
CDM
Angle between deflected beam to the actual beam at the same point
Slope of the beam
Is defined as the vertical displacement of a point on a loaded beam.
Deflection Of a beam
