The effective length of a masonry wall stiffened by buttresses on both ends and continuing beyond these buttresses at both ends is Where L is the c/c length of the wall between successive buttresses.
The effective length of a masonry wall stiffened by buttresses on both ends and continuing beyond these buttresses at both ends is Where L is the c/c length of the wall between successive buttresses. Correct Answer 0.8 L
Concept:
Effective length:
The effective length of the wall may be taken from table, where, L = the length of wall from between centres of piers, bitterness of cross-walls, H is the actual height of 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 |
The effective length of a masonry wall stiffened by buttresses on both ends and continuing beyond these buttresses at both ends is 0.8L.
