Contribution of Steel Casing to Single Shaft Foundation Structural Resistance (2018) / Chapter Skim
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159 This chapter summarizes the major observations and conclusions from the study on the contribution of steel casing to single shaft foundation structural resistance under the NCHRP 12-93 project.
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160 Contribution of Steel Casing to Single Shaft Foundation Structural resistance • From the analyses conducted in Section 2.2.11, a change in the diameter of the shaft does not affect the friction that is needed to achieve composite behavior for a given H/D ratio. • Results obtained on shaft behavior, including the adequacy of a friction coefficient of 0.5 to achieve composite action, did not change significantly when analyses were run with a reinforced concrete column connected to the top of the shaft, except for the development of a load transfer zone at the top of the shaft.
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Conclusions 161 top of it, and seven double curvature cyclic semi-static shear tests on RCFST and CFST shafts. The objective of the flexural tests was to validate the findings from the parametric study conducted in Chapter 2.
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From page 162... ...
162 Contribution of Steel Casing to Single Shaft Foundation Structural resistance • Based on the experimental results and supporting finite element analyses results, new ultimate and damage-controlling limit states are proposed for displacement-based design purposes. • The existing effective stiffness equations in various codes and design guidelines were evaluated by comparison with experimental and finite element results.
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From page 163... ...
Conclusions 163 maximum point, was equal to (on average) 160 kips.
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