ETL 1110-2-355
31 Dec 93
between monoliths should be compatible with the
c. Cost. Increasing the lengths of monoliths in
type of force(s) transmitted across the joint. A water-
a U-frame lock is generally considered to be a cost-
stop at the joint between monoliths will be required
saving measure. Increasing the length of monoliths
to stop the transmission of foundation material
will reduce forming costs and the number of joints to
through the joint. Walls of monoliths can be detailed
receive preparation. Another item which should be
and analyzed to act independently if their base slabs
considered with respect to cost is the length of the
are doweled together.
reinforcing bars. Since reinforcing bars are generally
shipped in lengths of 60 ft, a monolith slightly longer
c. Further discussion on joint treatment/detailing
than 60 ft may not be cost effective due to splicing
which would be required.
is found in other guidance.
9-7. Joint treatment/detailing.
10. Specifications and Details
a. Independent monolith action is ensured by
The items discussed herein address the analysis and
proper detailing at monolith joints. The joint thick-
design of U-frame lock monoliths without discussing
ness should consider the monolith deflections toward
the specifications and details required to complete a
each other and the compressibility of the joint
design. While not addressed specifically in this guid-
material.
ance, proper attention to the specifications and details
is a vital part of the complete design process. Guide
b. The base slabs of adjacent monoliths may be
specifications are available for use by the designer
required to act together to resist shear, tension, and/or
and should be studied carefully and modified as nec-
compression (see paragraph 8-1b). This is done by
essary for each project. Good details are an essential
doweling the bases together to obtain a shear-friction
element in producing a quality product. Designers
connection or by the use of shear keys. Tension
should draw on past experience and review other
between base slabs is resisted by dowels. Compres-
available guidance.
sion is resisted by concrete bearing. Joint treatment
A-39
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