Abstract
A procedure is presented that utilizes the backfill properties of soil friction angle and constant of horizontal subgrade reaction along with posthole dimension diameter and post dimensions to determine the pressure exerted by a post on the undisturbed soil around the posthole. The combined backfill and undisturbed soil stiffness is also derived using the added undisturbed soil property of constant of horizontal subgrade reaction. Design engineers may use the procedure to properly size postholes and posts and select backfill material so that the undisturbed soil will not be overstressed. The combined backfill-undisturbed soil stiffness allows more accurate prediction of frame stiffness in post-frame buildings, estimation of inflection points on posts, and estimation of building eave deflections. In general, a better understanding of post-frame building behavior results from the use of the procedures presented.
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