EP 1110-2-12
30 Sep 95
6-4.
Static Loads Not To Be Considered
entire interface area. Under the MCE, any cracking
in the concrete would only extend just beyond the
microcracking level. These fine cracks are open and
There are several types of loads where the magnitude
subject to buildup of internal water pressure for a
of the load and the load pattern that would exist at
the time of the design earthquake event cannot be
short period of time due to the oscillatory nature of
defined on a logical basis or to any degree of accur-
the dynamic response. Therefore, uplift or internal
acy. However, based on the general nature and range
water pressure within concrete cracks would be quite
of magnitude normally associated with loads of this
small and may be ignored in the dynamic analysis
type, and in comparing these loads with the dynamic
phase of design.
and static loads already discussed, these loads nor-
mally do not contribute significantly to the results of
b. Temperature stresses. Except under extreme
the analyses for earthquake load cases. However, the
climatic conditions, temperature stresses need not be
designer should at least make a cursory evaluation of
included as part of the earthquake load cases.
these loads to be sure that no unusual site conditions
exist that would warrant including one or more of
c. Wind load. Wind load on an RCC dam is so
them in the earthquake load cases. For this reason, a
small it can be considered insignificant.
brief discussion of these loads is included.
d. Ice load. Ice loading need not be included as
part of an earthquake load case except for unusual
ity using the seismic coefficient method described in
climatic conditions which would cause a great depth
paragraph 2-1, uplift is considered to act over the
of ice to exist over an extended period of time.
6-2
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