Engineering Journal '93

The increasing use and reliance on probability based limit
states design methods, such as the recently adopted AISC
LRFD Specification,
1
has focused new attention on the prob-
lems of serviceability in steel buildings. These methods,
along with the development of higher-strength steels and
concretes and the use of lighter and less rigid building mate-
rials, have led to more flexible and lightly damped structures
than ever before, making serviceability problems more
prevalent.
The purpose of this paper is to focus attention on two
important serviceability limit states under wind loads;
namely, deformation (including deflection, curvature, and
drift) and motion perception (acceleration). These issues are
particularly important for tall and/or slender steel and com-
posite structures. A brief review of available information on
these subjects will be presented followed by a discussion of
current standards of practice, particularly in the United States.
Finally, proposed standards will be presented that, hopefully,
will focus attention, debate, and perhaps new research efforts
on these very important issues in design.
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