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Consider the following statements in respect of arched construction made of voussoirs: 1. The superimposed load is transferred to the sidewalls only by the strength of cohesion of the mortar between the voussoirs. 2. The arch may fail under crushing when the compressive stress or thrust in it exceeds the safe crushing strength of the voussoir material. 3. Every element in the arch is subjected to compression only. 4. Failure of the arch due to the sliding of any voussoir past the adjacent one due to transverse shear can be avoided by reducing the height of the voussoirs. Which of the above statements are correct?

Consider the following statements in respect of arched construction made of voussoirs: 1. The superimposed load is transferred to the sidewalls only by the strength of cohesion of the mortar between the voussoirs. 2. The arch may fail under crushing when the compressive stress or thrust in it exceeds the safe crushing strength of the voussoir material. 3. Every element in the arch is subjected to compression only. 4. Failure of the arch due to the sliding of any voussoir past the adjacent one due to transverse shear can be avoided by reducing the height of the voussoirs. Which of the above statements are correct? Correct Answer 2 and 3 only

The structure constructed of wedge shaped block of stones or bricks and jointed together with mortar called Voussoirs. (Refer the following figure).

The following points should be remembered about arch:

1. Every element of arch remains in compression.  (Statement III – True)

2. An arch fails due to:

a) Crushing of the masonry- If the compressive stress exceeds the safe crushing strength of the masonry unit and mortar, the arch will fail in crushing.  (Statement II– True)

b) Sliding of voussoirs- To safeguard against sliding of voussoirs past each other due to transverse shear, the voussoirs of greater height should be provided. (Statement IV– False)

c) Rotation of some joints about an edge

d) Uneven settlement of an abutment or pier.

3. Transfer of load to side walls takes place by both strength of cohesion of the mortar between the   voussoirs and wedge shaped stones.   (Statement I-False)

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