Design of Steel Structures (2180610) MCQs

MCQs of Plastic Design

Showing 11 to 20 out of 40 Questions
1 2 3 4
11.
Which of the following assumptions is correct for plastic design?
(a) Material obeys Hooke’s law after the stress reaches fy.
(b) Yield stress and modulus of elasticity does not have same value in compression and tension.
(c) Material is homogeneous and isotropic in both elastic and plastic states.
(d) Material is not sufficiently ductile to permit large rotations.
Answer:

Option (c)

12.
Which of the following assumptions is not correct for plastic design?
(a) Plastic hinge rotations are small compared with elastic deformations so all the rotations are concentrated at plastic hinges.
(b) Segments between plastic hinges are rigid.
(c) Influence of normal and shear forces on plastic moments is not considered.
(d) Plane section remains plane after bending and the effect of shear is neglected.
Answer:

Option (a)

13.
Which of the following conditions is true for using plastic method of analysis as per IS 800?
(a) Members shall not be hot-rolled or fabricated using hot-plates.
(b) Yield stress of steel should not be greater than 450 MPa.
(c) Cross section should be unsymmetrical about its axis perpendicular to axis of plastic hinge rotation.
(d) Cross section of members not containing plastic hinges should be ‘plastic’ and those members containing plastic hinges should be ‘compact’.
Answer:

Option (b)

14.
Which of the following is true regarding plastic design methods?
(a) Design needs to satisfy elastic strain compatibility conditions.
(b) Different factor of safety for all parts of the structure.
(c) Saving of material over elastic methods resulting in lighter structures.
(d) Design is affected by temperature changes, settlement of support, etc.
Answer:

Option (c)

15.
Which of the following is true regarding plastic design methods?
(a) Difficult to design for fatigue.
(b) More saving in column design.
(c) Lateral bracing requirements are less stringent than for elastic design.
(d) Moments produced by different loading conditions can be added together.
Answer:

Option (a)

16.
What is plastic hinge?
(a) Zone of bending due to flexure in a structural member.
(b) Zone of yielding due to flexure in a structural member.
(c) Zone of non-yielding due to flexure in a structural member.
(d) Zone of yielding due to twisting in a structural member.
Answer:

Option (b)

17.
Plastic hinge behaves like a ______
(a) Friction mechanical hinge except that there is always a fixed moment constraint.
(b) Frictionless mechanical hinge except that there is no fixed moment constrain.
(c) Friction mechanical hinge except that there is no fixed moment constraint.
(d) Frictionless mechanical hinge except that there is always a fixed moment constraint.
Answer:

Option (d)

18.
What is plastic-collapse load?
(a) Load at which sufficient number of elastic hinges are formed.
(b) Load at which sufficient number of plastic hinges are not formed.
(c) Load at which sufficient number of plastic hinges are formed.
(d) Load at which structure fails.
Answer:

Option (c)

19.
What is difference between plastic design and elastic design?
(a) In plastic design, redistribution of bending moment is considered.
(b) In plastic design, redistribution of bending moment is not considered.
(c) In elastic design, redistribution of bending moment is considered.
(d) Both in plastic and elastic design, redistribution of bending moment is considered.
Answer:

Option (a)

20.
Which of the following statement is correct?
(a) Plastic limit load is obtained by multiplying working load with load factor.
(b) Plastic limit load is obtained by dividing working load with load factor.
(c) Working load is obtained by multiplying plastic limit load with load factor.
(d) Working load is obtained by multiplying working load with load factor.
Answer:

Option (a)

Showing 11 to 20 out of 40 Questions
1 2 3 4