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Re: Seismic Design of Concrete Silos per ACI 313-97

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Section 4.4.8 of ACI 313-97 reads as follows:

Silos to be located in earthquake zones shall be designed and constructed to withstand lateral seismic forces calculated using the provisions of the Uniform Building Code, except that the effective weight of the stored material shall be taken as 80 percent of the actual weight.  The centroid of the effective weight shall coincide with the centroid of the actual volume.  The fundamental period of vibration of the silo shall be estimated by any rational method.

ACI 313-97 references the 1994 UBC in chapter 8.

Patrick Ebner, PE

>>> "Ed Marshall" <elmarshall(--nospam--at)HASimons.com> 10/06/99 09:22AM >>>
Paragraph 4.4.5.1 of the 1991 edition of ACI 313, "Standard Practice for
Design and Construction of Concrete Silos ...", states that silos ... shall
be designed ... to withstand lateral seismic forces ... using the provisions
of the Uniform Building Code, 1988 Edition, except that the effective weight
of the stored material shall be taken as 80 percent of the actual weight."

We are doing some foundation studies, and don't have a copy of the 1997
edition of this standard at hand.  Does anyone know how this section reads
in the 1997 edition?  Particularly, if the use of 80 percent of the actual
weight is still sanctioned.

Ed Marshall, PE