To Rodrigo Lema:
Answer the following questions:
1. If you provide a gap which is a little bit more than the
anticipated deflection of the frame do you think the frame will still lean on
2. Assuming that the frame will lean on the wall but the wall
was not designed to resist the shear or lateral load, what will happen to the
My guess is, it will fail ( or crack).
3. If the wall will fail, will the frame be able to resist the
lateral load that has designed for in the first place?
4. Since you can't rely on the strength of the infilled wall how
can you use it for design?
Manufacturers of CMUs have controlled environment to make sure that
their products are manufactured as per the specified strength. They do test
their products using standard practice of testing. This way they are sure
that the strength of CMU in each specified design mix is attainable. CHBs
are not. They are mixed at the site with some kind of proportion and without
the benefit of testing. For all I know, CHB's strength is only about 200 psi
(I'm not sure on this). If your clay brick is the same as CHB in reliability
then it is hard to use the infilled walls to resist lateral loads without the
support of standard testing. I know where you were coming from when thought
how these infilled walls can resist the lateral loads. But until somebody can
come up with a more established and controlled environment in producing the
CHBs or brick walls for that matter then using them for resisting the lateral
loads is not advisable. Use CMUs or Jack-Built instead. (Jack Built is a
brand name of CMU).
Alfonso S. Quilala Jr., P.E.