UFC 4-023-03
25 January 2005
Table 6-4 Deformation Limits for Masonry
AP for Medium and
AP for Low LOP
High LOP
Rotation,
Rotation,
Component
Degrees
Degrees
()
()
(θ)
(θ)
Unreinforced MasonryA
-
2
-
1
Reinforced MasonryB
-
7
-
2
A
Response of unreinforced masonry walls is also limited by D/t, the
maximum member displacement to thickness ratio. This ratio is limited to 0.75.
Compare this limit with the rotation limits and use the most restrictive condition.
Also, all of these deformation limits apply to European clay tile and single,
double and triple wythe brick.
B
The ultimate resistance is based on the moment capacity using 90% of
Fy for reinforcement.
6-4
ADDITIONAL DUCTILITY REQUIREMENTS.
For MLOP and HLOP structures, design all perimeter ground floor columns
and load-bearing walls such that the lateral uniform load which defines the shear
capacity is greater than the load associated with the flexural capacity, including
compression membrane effects where appropriate. Methods for calculating the
compression membrane effects can be found in Reinforced Concrete Slabs and UFC 3-
340-01.
6-9
Previous Page
