MIL-HDBK-1191
Section 5:STRUCTURAL DESIGN
5.1
General. This Section provides criteria for the selection,
analysis, and design of structural system(s) and materials to be used for
military health care facilities. Additional criteria relating to seismic
design is provided in Section 6, Seismic Design, of this Military Handbook.
5.2
Design Criteria. Structural design for military health care
facilities shall be in accordance with references A through F. Structural
material design considerations shall be in accordance with references G
through L.
5.3
Design Loadings. Unless otherwise indicated herein, the minimum
design loadings for military health care facilities shall be in accordance
with ASCE 7-95 (reference AA).
5.3.1
Floor live loads shall be as given in Appendix A. Roof live loads,
other than snow loads which are addressed below, shall be in accordance with
ASCE 7-95 (reference AA). The live load factors to be used in load
combinations must include dead, wind, seismic, etc.
5.3.2
Wind Loads. Determine basic wind speeds from the tables in TI
809-01 (reference A), unless a site-specific study of local records indicates
a higher value should be used. The tables are based on a wind speed with a
recurrence interval of 50-years, an Exposure C condition (open terrain with
scattered obstructions having heights generally less than 30 feet), and a 3-
second gust 33-feet above the ground. Using these basic wind speeds, use ASCE
7-95 (reference AA) procedures to determine the design wind pressure loading.
Design basic wind speeds will normally be based on "Exposure C" conditions;
exceptions are allowed where it can be clearly established that lesser loads
associated with "Exposure B" conditions (towns, city outskirts, wooded areas
and rolling terrain), or where greater loads associated with a coastal
waterfront site, are applicable. Give appropriate consideration to unusual
channeling, lifting, or gusting effects from promontory mountain, hill, or
valley exposures. Do not use "Exposure A" conditions for permanent military
health facilities.
5.3.3
Snow Loads. Determine ground snow loads from the tables in TI
809-01 (reference A), unless a site-specific study of local records indicates
a higher value should be used. If a building location is not in the
referenced tables, the ground snow load map in ASCE 7-95 (reference AA) may be
used. Use ASCE 7-95 procedures to determine the design roof snow loads,
including drifting, sliding, etc.
5.3.4
Seismic Loads. Requirements for seismic design are contained at
Section 6 of this Military Handbook.
5.3.5
Load Combinations. The basic design loadings shall be considered
to act in union in the strength design combinations given in ASCE 7-95
(reference AA).
Use the combination or combinations of loadings that produce
the greatest overall loading and the most unfavorable effects on the building
or its structural components as the basis of design.
5.3.6
Frost Penetration. Determine the minimum design depth of building
foundation below finished grade using the tables and procedures in TI 809-01
(reference A).
5-1
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