80
3.7.6.2.6 Attach interior ceiling-mounted fixtures to the supporting structural
system in inhabited structures. This includes suspended ceilings, light
fixtures, and mechanical and electrical ducting and pipes. Seismic support of
these items is described in TI 809-04 "Seismic Design for Buildings". This
requirement is independent of standoff distances.
3.7.7 Foundation
3.7.7.1 Concrete masonry foundation walls below grade will be filled solid
with corefill concrete to prevent water from accumulating.
3.7.7.2 Provide a typical foundation and ground floor slab detail within the
construction (drawing) documents. This detail will note the geotechnical
soils report recommendations for preparation of soils to support the building
foundation and concrete slab.
3.7.8 Renovations/Alterations
3.7.8.1 Refer to TI 809-05 "Seismic Evaluation and Rehabilitation for
Buildings" & TI 809-51 "Seismic Review Procedures for Military
Buildings" for seismic evaluation and upgrading of existing structures.
3.7.8.2 When altering an existing structure, consult the Using Service
(ACSIM-AR) for extents of structural upgrading for current code
compliance and life safety requirements.
3.7.8.3 In addition to structural design criteria, the seismic capability of
existing structures must be evaluated. The analysis should be implemented
as follows:
3.7.8.3.1 The seismic evaluation analysis will be carried to the extent
necessary to determine a reasonable estimate of the life safety requirement
(safety of personnel, i.e., to prevent collapse of building). Where complete
design data and as-built drawings are not available, investigation of the
structure will be made as necessary to perform the life safety evaluation and
will be based on the following parameters.
3.7.8.3.2 Calculations will ordinarily be limited to the analysis of
representative frames or load-bearing shear walls in both directions of the
structure. Seismic forces will be carried to the foundations.
3.7.8.3.3 Consult the Using Service (ACSIM-AR) regarding lateral
resisting systems redundancy according to AT/FP guidelines.
3.7.8.3.4 Roof and floor diaphragms will be investigated to transfer the
lateral load to the frames or shear walls, particularly the connections.
UFC 4-171-05
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