CEMP-E
TI 809-02
1 September 1999
Table 1-4. Deflection Limits.
(Adapted from the International Building Code (IBC)-Final Draft)
Construction
Live
Snow or
Dead +
Loads
Wind
Live
Loads
Load
Roof members
Supporting plaster ceiling
l / 360
l / 360
l / 240
Supporting Non-plaster
l / 240
l / 240
l / 180
ceiling
Not supporting Ceiling
l / 180
l / 180
l / 120
Floor Members
l / 360
----------
l / 240
Exterior walls and interior
partitions
With brittle finishes
l / 240
l / 240
----------
With flexible finishes
l / 120
l / 240
----------
1-9. LOAD PATH CONTINUITY AND INTEGRITY.
a. General. Building designers must understand how the building will respond to vertical
and lateral loads. Follow all loads through the structure to assure all the structural elements
and connections along the load path have sufficient strength and stiffness to maintain
structural integrity. Direct and continuous load paths from the roof to foundation must be
provided. Building configuration, continuous and redundant load paths, connection detailing,
system ductility, quality of materials, and construction are important to building performance.
These ancillary aspects of building design are covered in Chapter 2.
b. Structural Integrity. In accordance with ASCE 7, buildings and other structures will be
designed to sustain local damage under extreme loading conditions with the structural system
as a whole remaining stable. This objective can be achieved by an arrangement of structural
elements which assures loads can be transferred from any locally damaged region to adjacent
regions capable of resisting those loads. This can be accomplished by providing sufficient
continuity, redundancy, and energy dissipating capability (ductility).
1-10. OVERSEAS CONSTRUCTION. Where local materials of grades other than those
referenced herein are to be used, the working or yield stresses and details of construction will
be modified as required by the structural property characteristics of the local material. The
material, as far as practicable, will be of equivalent or better grade than the comparable grades
referenced herein.
1-11. SERVICE LIFE. Service life of various buildings and facilities is defined as follows:
a. Permanent construction. Permanent construction will be designed and constructed
to serve a life expectancy of 25 years or more, will be energy efficient, and will include finishes,
materials, and systems selected for low maintenance and low life cycle costs.
1-4
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