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The University of Tennessee of
Chattanooga found that due to a steady increase of the student
population a new library was required. Also because of a
transition of media type and storage, as well as research
techniques, a modification of the existing library’s space
allocation was also required. A five story structure will
house the new library. The structure is composed of
cast-in-place concrete that utilizes post-tensioned as well as
conventional reinforcement. Lateral loads are resisted by
shear walls and moment resisting structural frames. Existing
geotechnical problems required a two step resolution. First
it was determined that a shallow spread footing foundation
system would be the most economical solution. However both
overall and differential settlement would be issues. Soil
enhancement utilizing a rammed aggregate system was used to
alleviate settlement issues. As a byproduct of this system
the allowable soil bearing was also increased. A second
geotechnical issue involved deep voids located in various
locations throughout the site. The non uniform size of these
voids, their depth from the existing ground surface, and most
importantly the impact on the selected foundation system
required installation of deep pressure grout.
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