RCC STRUCTURES DESIGN QUIZ

If jd is the lever arm and ΣO is the total perimeter of reinforcement of an R.C.C. beam, the bond stress at the section having Q shear force, is

2 × Q/jdƩO

Q/2jdƩO

Q/3jdƩO

Q/jdƩO

TRUE ANSWER : ?
YOUR ANSWER : ?

In a singly reinforced beam

Steel possesses initial stresses when embedded in concrete

Plane sections transverse to the centre line of the beam before bending remain plane after bending

Compression is borne entirely by concrete

Elastic moduli for concrete and steel have different values within the limits of deformation of the beam

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If the ratio of long and short spans of a two way slab with corners held down is r, the actual reduction of B.M. is given by

(5/6) (r²/1 + r⁴) M

(5/6) (r²/1 + r³) M

(5/6) (r²/1 + r²) M

(5/6) (r/1 + r²) M

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For a ribbed slab

Width of the rib shall not be less than 7.5 cm

Clear spacing between ribs shall not be greater than 4.5 cm

Overall depth of the slab shall not exceed four times the breadth of the rib

All listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

If d and n are the effective depth and depth of the neutral axis respectively of a singly reinforced beam, the lever arm of the beam, is

d

d - n/3

n

d + n/3

TRUE ANSWER : ?
YOUR ANSWER : ?

As the percentage of steel increases

Depth of neutral axis decreases

Lever arm decreases

Lever arm increases

Depth of neutral axis increases

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YOUR ANSWER : ?

The amount of reinforcement for main bars in a slab, is based upon

Minimum bending moment

Minimum shear force

Maximum bending moment

Maximum shear force

TRUE ANSWER : ?
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If the maximum bending moment of a simply supported slab is M Kg.cm, the effective depth of the slab is (where Q is M.R. factor)

M/10√Q

M/100Q

√(M/Q)

√(M/100Q)

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YOUR ANSWER : ?

For a circular slab carrying a uniformly distributed load, the ratio of the maximum negative to maximum positive radial moment, is

3

5

2

1

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YOUR ANSWER : ?

The maximum ratio of span to depth of a slab simply supported and spanning in two directions, is

30

40

25

35

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YOUR ANSWER : ?