Details:

Creators:
Ashour, Mohamed ; Norris, Gary
Ashour, Mohamed ; Norris, Gary Less -
Corporate Creators:
University of Nevada. Dept. of Civil & Environmental Engineering
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Piling (Civil Engineering) Shear Strength Of Soils Testing
Publication/ Report Number:
CA02-0076 ; UNR / CCEER 01-02
CA02-0076 ; UNR / CCEER 01-02 Less -
Resource Type:
Tech Report
Geographical Coverage:
California
Corporate Publisher:
California. Department of Transportation
Abstract:
Strain wedge (SW) model formulation has been used, in previous work, to evaluate the response of a single pile or a group of piles (including its

pile cap) in layered soils to lateral loading. The SW model approach provides appropriate prediction for the behavior of an isolated pile and pile

group under lateral static loading in layered soil (sand and/or clay). The SW model analysis covers the entire range of soil strain or pile deflection

that may be encountered in practice. The method allows development of p-y curves for the single pile based on soil-pile interaction by considering

the effect of both soil and pile properties (i.e. pile size, shape, bending stiffness, and pile head fixity condition) on the nature of the p-y curve.

This study has extended the capability of the SW model in order to predict the response of a laterally loaded isolated pile and pile group

considering the nonlinear behavior of pile material (steel and/or concrete) and its effect on the soil pile-interaction. The incorporation of the

nonlinear behavior of pile material has a significant influence on the lateral response of the pile/shaft and its ultimate capacity. The reduction in pile

lateral resistance due to degradation in the pile bending stiffness affects the nature of the accompanying p-y curves, and the distribution of lateral

deflections and bending moment along the pile. Contrary to the traditional Matlock-Reese p-y curve that does not account to the variations in the

pile bending stiffness, the modulus of subgrade reaction (i.e. the p-y curve) assessed based on the SW model is a function of the pile bending

stiffness. In addition, the ultimate value of soil-pile reaction on the p-y curve is governed by either the flow around failure of soil or the plastic hinge

formation in the pile.

The SW model analysis for a pile group has been modified in this study to assess the p-y curves for an individual pile in a pile group. The

technique presented is more realistic and evaluates the variations in the stress and strain (i.e. Young’s modulus) in the soil around the pile in

question due to the interference with the neighboring piles in a pile group in a mobilized fashion. The nonlinear behavior of pile material is also

incorporated in the SW model analysis for a pile group.


Format:
PDF
Funding:
DRI Research Task No. 0076 ; 59A0160
DRI Research Task No. 0076 ; 59A0160 Less -
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:a359d88aba5388d9c5d19e94c34dbac0f44a472af3938aca335cced97697ffd5
Download URL:
https://rosap.ntl.bts.gov/view/dot/27664/dot_27664_DS1.pdf
File Type:

Supporting Files

• No Additional Files

More +