Evaluation of Tangent Bearing Element Axial Load Response-PPT Presentation

PPT Presentation

Pdf Summary

The presentation evaluates the axial-load response of Tangent Bearing Elements (TBEs), formed by grouping auger-cast-in-place (ACIP) piles—also known as continuous-flight-auger or auger pressure-grouted piles—at spacing of one pile diameter so they act as a single foundation element.<br /><br />TBEs offer an alternative where conventional ACIP piles may be too small for projects requiring large-diameter foundations or shear walls. The presentation discusses their equivalent perimeter and reports results from bi-directional load testing of two case histories.<br /><br />Although the available data set is limited, the results indicate that when a TBE’s surface area is represented by its enveloping perimeter, its unit shear and end-bearing resistance is comparable to that of a traditional ACIP or bored pile. The presentation also finds that bi-directional load testing of TBEs is feasible and straightforward, allowing their load-bearing resistance to be verified.<br /><br />The presenters suggest that this ability to test TBEs may support their wider use on future projects. The findings and recommendations are the presenters’ views and are not necessarily endorsed by DFI.

Keywords

Tangent Bearing Elements

ACIP piles

axial load response

bi-directional load testing

equivalent perimeter

end-bearing resistance

unit shear resistance

bored pile

continuous-flight-auger piles

foundation elements