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Plastic and Local Buckling Behaviour of Steel

Course: Structural Engineering — Practice MCQs, solutions, formulas & past entrance questions.

Courses › Structural Engineering › Plastic and Local Buckling Behaviour of Steel

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Plastic-and-Local-Buckling-Behaviour-of-Steel (Click to view content)

1. What is hinged length for simply supported rectangular beam of span L with uniformly distributed load?

L/√3 L/√2 L/2 L/5

L/√3

For simply supported rectangular beam with uniformly distributed load, hinged length is equal to span/?3.

Hint Answer

2. The effective width of hot-rolled and welded plates is given by

b_e/b = α √(f_y/f_cr) b_e/b = α √(f_cr x f_y) b_e/b = α √(f_cr +f_y) b_e/b = α √(f_cr/f_y)

b_e/b = α √(f_cr/f_y)

The effective width of hot-rolled and welded plates is given by b_e/b = ? ?(f_cr/f_y), where ? is parameter that indicates inclusions of influence of initial curvatures and residual stress. Generally ?=0.65.

Hint Answer

3. Which of following relation about plastic moment is correct?

M_p = Z_p /f_y M_p = Z_p + f_y M_p = Z_pf_y M_p = Z_p – f_y

M_p = Z_pf_y

When every fibre of section has a strain equal to or greater than ?_y=f_y/E_s , nominal moment strength is referred as plastic moment and is given by M_p = Z_pf_y , where Z_p = ?ydA is plastic section modulus and f_y = yield stress.

Hint Answer

4. Which of following is true about kinematic analysis?

virtual work equations are not used to determine collapse load virtual work equations are used to determine collapse load equilibrium condition is assumed plasticity condition is assumed

virtual work equations are used to determine collapse load

In kinematic method, a mechanism is assumed and virtual work equations are used to determine collapse load.

Hint Answer

5. Single-span beams collapse as ____

single-bar mechanism two-bar mechanism three-bar mechanism does not collapse

two-bar mechanism

Single-span beams generally collapse as two-bar mechanisms with a hinge at each support and plastic hinge within span.

Hint Answer

6. Which of following is true regarding plastic design methods?

design needs to satisfy elastic strain compatibility conditions different factor of safety for all parts of the structure saving of material over elastic methods resulting in lighter structures design is effected by temperature changes, settlement of support, etc

saving of material over elastic methods resulting in lighter structures

The following are advantages of plastic design methods: (i) realisation of uniform and realistic factor of safety for all parts of structure , (ii)simplified analytical procedure and rapidity of obtaining moments since no need to satisfy elastic strain compatibility conditions, (iii) no effect due to temperature changes, settlement of support, etc, (iv) saving of material over elastic methods resulting in lighter structures.

Hint Answer

7. Which of following condition is true for kinematic orem?

load must be greater than collapse load load must be less than collapse load load must be not equal to collapse load load cannot be related to collapse load

load must be greater than collapse load

For a given frame subjected to a set of loads P, value of P which is found to correspond to any assumed mechanism, must be greater than or equal to collapse load Pu.

Hint Answer

8. Which of following relation is correct for pin based frames?

M_p =γ_L(wL²/8)[1-k+(1+k)^0.5]. M_p =γ_L(wL²/8)[1+k+(1-k)^0.5]. M_p =γ_L(wL²/8)[1+k-(1+k)^0.5]. M_p =γ_L(wL²/8)[1+k+(1+k)^0.5].

M_p =γ_L(wL²/8)[1+k+(1+k)^0.5].

When gravity load governs design, a good estimate of required section may be obtained by using following formulae :
For pin based frames : M_p =?L(wL²/8)[1+k+(1+k)^0.5] For fixed=-base frame : M_p =?L(wL²/8)[1/[1+0.5k+(1+k)^0.5]], where ?_L = 1.7 global load factor, k = h₂/h₁.

Hint Answer

9. What is fundamental path in graph?

line along load axis up to P > P_cr line along load axis up to P < P_cr line along load axis up to P = P_cr line along load axis up to P ≥ P_cr

line along load axis up to P = P_cr

If axial load verses lateral displacement is plotted, we get a line along load axis up to P=P_cr, this is called fundamental path.

Hint Answer

10. Which of following relation is correct about shape factor, v?

v = Z_p+Z_e v = Z_pZ_e v = Z_p/Z_e v = Z_e/Z_p

v = Z_p/Z_e

Shape factor, v = Z_p/Z_e = M_p/M_y , where Z_p and Z_e are plastic and elastic section modulus respectively, M_p and M_y are plastic and elastic moments respectively.

Hint Answer

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Simple Stress and Strain

Stresses in Members

Stresses in Members

Strain Energy and Resilience

Strain Energy and Resilience

Center of Gravity and Moment of Inertia

Center of Gravity and Moment of Inertia

Shear Force and Bending Moment

Shear Force and Bending Moment

Pure Bending

Shear Stress

Direct and Bending Stress

Direct and Bending Stress

Slope and Deflection

Slope and Deflection

Indeterminate Beams

Indeterminate Beams

Torsion

Plastic and Local Buckling Behaviour of Steel

Plastic and Local Buckling Behaviour of Steel

Cables and Arches

Cables and Arches

Influence Lines and Approximate Analysis for Statically Determinate Structures

Influence Lines and Approximate Analysis for Statically Determinate Structures

Deflections

Deflections Using Energy Methods

Deflections Using Energy Methods

Displacement Method of Analysis: Slope-Deflection Equations

Displacement Method of Analysis: Slope-Deflection Equations

Displacement Method of Analysis: Moment Distribution

Displacement Method of Analysis: Moment Distribution

Influence line diagram mcqs

Influence line diagram mcqs

Structural engineering important exam questions

Structural engineering important exam questions

Structural engineering important exam questions II

Structural engineering important exam questions II

Structural engineering important exam questions III

Structural engineering important exam questions III

Plastic Analysis

Plastic Analysis

Structural Engineering Loksewa Questions

Structural Engineering Loksewa Questions

Topics

This Chapter Plastic-and-Local-Buckling-Behaviour-of-Steel consists of the following topics

Plastic and Local Buckling Behaviour of Steel

What is hinged length for simply supported rectangular beam of span L with uniformly distributed load?

The effective width of hot-rolled and welded plates is given by

Which of following relation about plastic moment is correct?

Which of following is true about kinematic analysis?

Single-span beams collapse as ____

Which of following is true regarding plastic design methods?

Which of following condition is true for kinematic orem?

Which of following relation is correct for pin based frames?

What is fundamental path in graph?

Which of following relation is correct about shape factor, v?

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