TWO HINGED AND THREE HINGED ARCHES

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1. for a two-hinged arch,if one of the supports settles down vertically, then the horizontal thrust

A) is increased
B) is decreased
C) remains unchanged
D) becomes zero

... Answer is C


 

2. for a symmetrical two hinged parabolic arch,if one of the supports settles horizontally,then the horizontal thrust

A) is increased
B) is decreased
C) remains unchanged
D) becomes zero

... Answer is B

 

3. Influence line for horizontal thrust in a two hinged parabolic arch is

A) parabolic
B) cubic
C) triangular
D) rectangle

... Answer is A

 

4. for a single point load W moving on a symmetrical three hinged parabolic arch of span L, the maximum sagging moment occurs at a distance x from ends

A) 0.211L
B) 0.25L
C) 0.234L
D) 0.5L

... Answer is A
alternate c is correct ,when UDL moves on the span
 

5. a symmetrical two-hinged parabolic arch when subjected to a uniformly distributed load on the entire horizontal span is subjected to

A) radial shear alone
B) normal thrust alone
C) normal thrust and bending moment
D) normal thrust, radial shear and bending moment

... Answer is B
description
 

6. in a two hinged arch an increase in temperature induces

A) no bending moment in the arch rib
B) uniform bending moment in the arch rib
C) maximum bending moment at the crown
D) minimum bending moment at the crown

... Answer is C

 

7. An arch is used in long span bridges because there is

A) considerable reduction in horizontal thrust
B) considerable reduction in bending moment
C) reduction in shear and bending moment
D)no change in shear and bending moment 

Answer is B 

 

8. A symmetrical two-hinged parabolic arch rib has a span of 32 m between abutment pins at the same level and a central rise of 5 m. when a rolling load of 100 kn crosses the span, the maximum horizontal thrust at the hinges will be

A) 100 kN
B) 125 kN
C) 160 kN
D) 240 kN

... Answer is B
description
 

9. A parabolic arch, symmetrical, with hinges at centre and ends, carries a point load P at a distance x from left support. The arch has a span of 20 m and rise of 5 m. what is the value of x if the left hinge reaction in inclined with a slope of two vertical to one horizontal ?

A) 8 m
B) 5 m
C) 4 m
D) 2.5 m

... Answer is C

 

10. The horizontal thrust due to rise in temperature in a semicircular two hinged arch of radius R is proportional to

A) R
B) R^2
C) 1/R
D) 1/R^2

... Answer is D

 

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