Question 1

High strength concrete is used in prestressed member?
A)to ovecome bursting stresses at the ends
B)to provide high bond stresses
C)to overcome cracks due to shrinkage
D)to overcome bursting stresses, provide high bond stresses and overcome cracks

Accepted Answer

High strength concrete is used in prestressed members to overcome bursting stresses at the ends, provide high bond stresses, and overcome cracks due to shrinkage, making all the listed reasons correct.

Question 2

The advantage of reinforced concrete is due to______________            
A)monolithic character
B)moulding in any desired shape
C)fire-resisting and durability
D)monolithic character, moulding any shape and fire-resisting

Accepted Answer

Reinforced concrete is advantageous because it combines the monolithic character, the ability to be molded into any desired shape, and fire resistance and durability, making it a versatile and robust construction material.

Question 3

Cracking of the concrete section is nearly impossible to prevent.

Accepted Answer

Cracking in concrete is a common phenomenon due to its relatively low tensile strength, shrinkage, and thermal expansion. Despite efforts to minimize it, completely preventing cracks is nearly impossible.

Question 4

The architect is usually the lead designer on buildings, with a structural engineer employed as a sub-consultant.

Accepted Answer

The answer of The architect is usually the lead designer...

Question 5

Why plate girder is preferred over truss girder?
A)plate girder requires costly maintenance
B)higher vertical clearance required for plate girder than truss girder
C)cost of fabrication of plate girder is high
D)cost of fabrication of truss girder is high

Accepted Answer

The cost of fabrication for truss girders is generally higher than that for plate girders due to the complexity and the amount of labor involved in assembling the numerous members and connections in a truss structure. Plate girders, being simpler in construction, typically require less fabrication effort and cost.

Question 6

Bending resistance of plate girders can be increased by
A)decreasing distance between flanges
B)increasing distance between flanges
C)reducing distance between flanges to half
D)bending resistance cannot be increased

Accepted Answer

Increasing the distance between flanges increases the moment of inertia, which in turn increases the bending resistance of plate girders.

Question 7

Which of the following is economical if depth is limited and loads are too large?
A)rolled section beam
B)truss girder
C)welded box plate girder
D)bolted box plate girder

Accepted Answer

Welded box plate girders are economical for situations where depth is limited and loads are large because they can be designed to efficiently handle high loads with a compact cross-section, reducing material costs while maximizing strength.

Question 8

An ideal bolted plate girder section consists of
A)flange angles and cover plates for both compression flange and tension flange
B)flange angles and cover plates for compression flange and only flange angle for tension flange
C)only flange angle for compression flange and flange angles and cover plates for tension flange
D)flange angles for both compression flange and tension flange

Accepted Answer

Cover plates are typically added to the compression flange to increase its buckling resistance, while the tension flange, being less susceptible to buckling, often does not require cover plates and can be designed with just flange angles.

Question 9

The modes of failure of plate girder are
A)by yielding of compression flange only
B)by buckling of tension flange only
C)by yielding of tension flange and buckling of compression flange
D)by yielding of compression flange and buckling of tension flange

Accepted Answer

C) by yielding of tension flange and buckling of compression flange is correct because in plate girders, the compression flange is susceptible to buckling due to its slender nature, while the tension flange may yield due to the tensile forces acting on it.

Question 10

At high shear locations in the girder web, principal plane will be______________  to longitudinal axis of member
A)inclined
B)parallel
C)perpendicular
D)coincides

Accepted Answer

At high shear locations, the principal plane is inclined to the longitudinal axis of the member due to the combination of shear and normal stresses.

Question 11

Which of the following causes web buckling in plate girder?
A)diagonal tension
B)diagonal compression
C)diagonal tension and diagonal compression
D)neither diagonal tension nor diagonal compression

Accepted Answer

Web buckling in plate girders is primarily caused by diagonal compression. This occurs when the web plate of the girder is subjected to compressive stresses, leading to instability and potential buckling.

Question 12

Which of the following statement is correct for reducing web buckling due to diagonal compression?
A)not providing web stiffeners to increase shear strength
B)providing web stiffeners to reduce shear strength
C)increasing depth-to-thickness ratio
D)reducing depth-to-thickness ratio

Accepted Answer

Reducing the depth-to-thickness ratio of the web in a structural member increases its stiffness and resistance to buckling under diagonal compression. This is because a lower ratio means the web is thicker relative to its depth, making it less prone to buckling.

Question 13

Which of the following is correct during tension field action?
A)web can resist diagonal compression
B)horizontal component of diagonal compression is supported by flanges
C)vertical component of diagonal compression is supported by flanges
D)vertical component of diagonal compression is supported by stiffeners

Accepted Answer

The answer of Which of the following is correct during...

Question 14

Which of the statement is not true about intermediate stiffeners?
A)they reduce shear capacity of web
B)they improve shear capacity of web
C)they can be used to develop tension field action
D)their main purpose is to provide stiffness to the web

Accepted Answer

Intermediate stiffeners are used to improve the shear capacity of the web, develop tension field action, and provide stiffness to the web, thus making statement A incorrect as it suggests the opposite effect.

Question 15

Which of the following is correct regarding gantry girders?
A)it is laterally supported except at the columns
B)it is subjected to impact load
C)it should not be analysed for unsymmetrical bending
D)it is not subjected to longitudinal load

Accepted Answer

Gantry girders are subjected to impact loads due to the lifting and moving of heavy loads, which often cause dynamic effects in addition to the static loads.

Question 16

Which of the following loads are not considered in the design of gantry girders?
A)longitudinal loads
B)gravity loads
C)lateral loads
D)wind loads

Accepted Answer

Wind loads are typically not considered in the design of gantry girders as they primarily deal with loads from the crane and its operation, such as longitudinal, gravity, and lateral loads.

Question 17

The wheel load transferred from trolley to gantry girder is given by
A)w1 = [wt(lc+l1)]/(2lc)
B)w1 = [wt(lc-l1)](2lc)
C)w1 = [wt(lc-l1)]/(2lc)
D)w1 = [wt(lc+l1)]/( lc)

Accepted Answer

The wheel load transferred from trolley to gantry girder is given by w1 = [wt(lc-l1)]/(2lc). This is because the load is distributed evenly over the two wheels of the trolley, and each wheel carries half of the load. The distance between the wheels is lc, and the distance between the trolley and the gantry girder is l1.

Question 18

The maximum wheel load is obtained when
A)crane crab is farthest to gantry girder
B)crane crab is closest to gantry girder
C)crane crab is not attached
D)crane crab is at mid span

Accepted Answer

The maximum wheel load on a gantry girder occurs when the crane crab (the part of the crane that actually lifts and moves the load) is closest to the girder. This position results in the largest moment arm and thus the highest load on the girder due to the crane's operation.

Question 19

The bending moment due to dead load of girder is maximum at
A)one-third distance at span
B)two-third distance at span
C)end of span
D)centre of span

Accepted Answer

The bending moment due to dead load of a girder is maximum at the centre of the span, as the dead load is uniformly distributed along the length of the girder, creating the highest bending moment at the midpoint.

Question 20

The minimum recommended rise of trusses with Galvanised Iron sheets is
A)1 in 12
B)1 in 6
C)1 in 10
D)1 in 18

Accepted Answer

The answer of The minimum recommended rise of trusses with...

Quiz 4: Structural Design and Analysis

High strength concrete is used in prestressed member?

The advantage of reinforced concrete is due to______________

Cracking of the concrete section is nearly impossible to prevent.

The architect is usually the lead designer on buildings, with a structural engineer employed as a sub-consultant.

Why plate girder is preferred over truss girder?

Bending resistance of plate girders can be increased by

Which of the following is economical if depth is limited and loads are too large?

An ideal bolted plate girder section consists of

The modes of failure of plate girder are

At high shear locations in the girder web, principal plane will be______________ to longitudinal axis of member

Which of the following causes web buckling in plate girder?

Which of the following statement is correct for reducing web buckling due to diagonal compression?

Which of the following is correct during tension field action?

Which of the statement is not true about intermediate stiffeners?

Which of the following is correct regarding gantry girders?

Which of the following loads are not considered in the design of gantry girders?

The wheel load transferred from trolley to gantry girder is given by

The maximum wheel load is obtained when

The bending moment due to dead load of girder is maximum at

The minimum recommended rise of trusses with Galvanised Iron sheets is