5. What is the unit of virtual unit load? Explanation: Its unit
can be anything as it will cancel with that of n
. Δ = displacement caused when force is increased by a small amount.
What is change in length of member if temperature increases by Δt and expansion coefficient is Ά?
What is change in length of member if temperature increases by ΔT and expansion coefficient is ά? Explanation:
Change in length is directly proportional to change in temperature and expansion coefficient with 1 as proportionality coefficient
.
What is the unit load method?
The unit-load method is a
technique that will help us to quantify displacements and rotations of the equilibrium configuration
, that is, the shape of the structure after it has managed to equilibrate the applied loads.
Where unit load method is used?
The unit load method is extensively used in
the calculation of deflection of beams, frames and trusses
. Theoretically this method can be used to calculate deflections in statically determinate and indeterminate structures.
What is castigliano’s first theorem?
Castigliano’s first theorem The
first partial derivative of the total internal energy (strain energy)
in a structure with respect to any particular deflection component at a point is equal to the force applied at that point and in the direction corresponding to that deflection component.
What is unit of deflection?
The unit of deflection, or displacement, is a length unit and normally taken as
mm (for metric) and in (for imperial)
. This number defines the distance in which the beam has deflected from the original position.
Why it is called unit load method?
The unit-load method is a technique that
will help us to quantify displacements and rotations of the equilibrium configuration
, that is, the shape of the structure after it has managed to equilibrate the applied loads.
What is the SI unit of stiffness coefficient?
Explanation: Stiffness is the resistance to deflection. It is the ratio of force (unit N) to the extension (m). Hence its unit is
N/m
.
What are 2 examples of thermal expansion?
- Cracks in the road when the road expands on heating.
- Sags in electrical power lines.
- Windows of metal-framed need rubber spacers to avoid thermal expansion.
- Expansion joints (like joint of two railway tracks).
- The length of the metal bar getting longer on heating.
Do all object expand at same rate?
All three states of matter (solid, liquid and gas) expand when heated. The atoms themselves do not expand, but the volume they take up does. …
Liquids expand for the same
reason, but because the bonds between separate molecules are usually less tight they expand more than solids.
What is principle of virtual work Examveda?
The principle of virtual work can be applied to
elastic system
by considering the virtual work of. A. Internal forces only. External forces only. Internal as well as external forces.
Is column analogy method is force method?
The column analogous method is the
force method used to analyze the indeterminate structure
. In the method of column analogous, the actual structure is considered under the action of applied loads and the redundant acting simultaneously.
What is the relation between work done by external loads and work done by internal loads?
2. What is the relation between work done by external loads and work done by internal loads. Explanation: External and
internal displacements must be related by compatibility of displacement
. 3.
What is dummy load method?
The Unit dummy force method provides a
convenient means for computing displacements in structural systems
. It is applicable for both linear and non-linear material behaviours as well as for systems subject to environmental effects, and hence more general than Castigliano’s second theorem.
What is M EI diagram?
The vertical deviation of a point A on an elastic curve with respect to the tangent which is extended from another point B equals the moment of the area under the M/EI diagram between those two points (A and B). This moment is computed about point A where the deviation from B to A is to be determined.
