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What is the effective length of the wall when the wall is supported by a buttress or cross-wall?

What is the effective length of the wall when the wall is supported by a buttress or cross-wall? Correct Answer 1.0 L

Concept:

Effective length:

The effective length of the wall may be taken from the table,

where, 

L = the length of the wall from between centers of piers, the bitterness of cross-walls,

H is the actual height of the wall and h is the effective height of the wall.

S No

Condition of Support

Effective length(l)

1.

Where a wall is continuous and supportive by cross walls or buttresses and there is no opening within one eighth of the wall height, h or H ( whichever is less) from the face of the supporting wall or buttress

0.8 L

2.

Where a wall is supported by cross walls or buttresses at one end and continuous with buttress or wall supports at the other end.

1.0 L

3.

Where a wall is supported at each end by a buttress or a cross wall.

1.0 L

4.

Where the wall is free at one end and supported by a buttress or a cross wall at the other end.

1.5 L
As the end conditions are not specified properly we assume, wall is supported at each end by a buttress or a cross wall ∴ Effective length is 1 L

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