THEORY OF STRUCTURES QUIZ

For determining the support reactions at A and B of a three hinged arch, points B and Care joined and produced to intersect the load line at D and a line parallel to the load line through A at D’. Distances AD, DD’ and AD’ when measured were 4 cm, 3 cm and 5 cm respectively. The angle between the reactions at A and B is

60°

90°

45°

30°

TRUE ANSWER : ?
YOUR ANSWER : ?

A compound truss may be formed by connecting two simple rigid frames, by

Three bars

three parallel bars

Two bars

Three bars intersecting at a point

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The ratio of the deflections of the free end of a cantilever due to an isolated load at 1/3rd and 2/3rd of the span, is

3/7

4/7

1/7

2/7

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The horizontal deflection of a parabolic curved beam of span 10 m and rise 3 m when loaded with a uniformly distributed load l t per horizontal length is (where Ic is the M.I. at the crown, which varies as the slope of the arch).

200/EIc

50/EIc

100/EIc

150/EIc

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YOUR ANSWER : ?

In plastic analysis, the shape factor for a triangular section, is

1.5

1.34

2.5

2.34

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A rolled steel joist is simply supported at its ends and carries a uniformly distributed load which causes a maximum deflection of 10 mm and slope at the ends of 0.002 radian. The length of the joist will be,

14 M

15 M

13 M

16 m

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An isolated load W is acting at a distance a from the left hand support, of a three hinged arch of span 2l and rise h hinged at the crown, the horizontal reaction at the support, is

2h/Wa

Wa/2h

Wa/h

2W/ha

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Flat spiral springs

Consist of uniform thin strips

All of these

Are wound by applying a torque

Consist of uniform thin strips

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A compound bar consists of two bars of equal length. Steel bar cross -section is 3500 mm²and that of brass bar is 3000 mm². These are subjected to a compressive load 100,000 N. If Eb = 0.2 MN/mm² and Eb = 0.1 MN/mm², the stresses developed are:

b = 6 N/mm² s = 12 N/mm²

b = 5 N/mm² s = 10 N/mm²

b = 8 N/mm² s = 16 N/mm²

b = 10 N/mm² s = 20 N/mm 2

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Beams composed of more than one material, rigidly connected together so as to behave as one piece, are known as

Determinate beams

Indeterminate beams

Composite beams

Compound beams

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