Section 9.0 - Foundations and Anchorages

ID #1138

Section 9.6 What is the intent of the grade beam, similar device, or other approved method to resist a portion of the base seismic shear? Is it to resist differential foundation displacements during a seismic event, to resist the effects of liquefaction, or both? If differential displacements is a concern, what is the allowable displacement? Does the same force requirement (2/3 of the total base shear) apply for 3-legged and 4-legged structures alike?

The intent of the grade beam is to minimize differential displacement. Liquefaction is a separate site specific concern. The Standard does not specify the acceptable magnitude of differential displacement. The requirement is the same for 3 legged and 4 legged structures.

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Last update: 2014-01-06 21:50
Author: John Erichsen
Revision: 1.1

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