Axial Load Tests on 14-inch Pipe Piles in Clay

1979 ◽  
Author(s):  
W.R. Cox. ◽  
L.M. Kraft ◽  
E.A. Verner
Keyword(s):  
Axial Load ◽  
Load Tests

Helical Pile Capacity-to-Torque Correlation: A More Reliable Capacity-to-Torque Factor Based on Full Scale Load Tests

2020 ◽  
Vol 14 (2) ◽  
Author(s):  
Moncef Souissi
Keyword(s):  
Axial Load ◽  
Static Load ◽  
Full Scale ◽  
Load Direction ◽  
Pile Capacity ◽  
Helical Piles ◽  
Load Tests ◽  
High Torque ◽  
Low Torque ◽  
The One

The capacity-to-torque ratio, Kt, has been used in the design of helical piles and anchors for over half a century. Numerous research efforts have been conducted to accurately predict this capaci-ty-to-torque ratio. However, almost of all these Kt factors are based on shaft geometry alone. The ca-pacity-to-torque ratio described herein was found to depend on the shaft diameter, shaft geometry, helix configuration, axial load direction, and installation torque. In this study, 799 full scale static load tests in compression and tension were conducted on helical piles of varying shaft diameters, shaft geometry, and helix configurations in different soil types (sand, clay, and weathered bedrock). The collected data were used to study the effect of these variables on the capacity-to-torque ratio and resulted in developing a more reliable capacity-to-torque ratio, Km, that considers the effect of the variables mentioned above. The study shows that the published Kt values in AC358 (ICC-ES Acceptance Criteria for Helical Piles Systems and Devices) underestimate the pile capacity at low torque and overestimate it at high torque. In addition, and based on probability analysis, the predicted capacity using the modified Km results in a higher degree of accuracy than the one based on the published Kt values in AC358.

Static and Cyclic Axial Load Tests on a Fully Instrumented Pile

2009 ◽  
pp. 416-416-19
Author(s):  
TD Lu ◽  
JA Fischer ◽  
VG Miller
Keyword(s):  
Axial Load ◽  
Load Tests

Axial Load and Cyclic Lateral Load Tests for Composite Columns with Steel Angles

2016 ◽  
Vol 142 (5) ◽  
pp. 04016001 ◽  
Author(s):  
Hyeon-Jong Hwang ◽  
Tae-Sung Eom ◽  
Hong-Gun Park ◽  
Seung-Hwan Lee
Keyword(s):  
Axial Load ◽  
Lateral Load ◽  
Composite Columns ◽  
Cyclic Lateral Load ◽  
Load Tests ◽  
Steel Angles

scholarly journals Modeling of shear stiffness reduction from database of axial load tests on pile foundations

2019 ◽  
Vol 92 ◽  
pp. 13002
Author(s):  
Fawad S. Niazi ◽  
Paul W. Mayne
Keyword(s):  
Shear Modulus ◽  
Axial Load ◽  
Small Strain ◽  
Pile Foundations ◽  
Soil Parameters ◽  
Foundation Soil ◽  
Nonlinear Load ◽  
Stiffness Reduction ◽  
Nonlinear Stress ◽  
Load Tests

Initiating at the small-strain shear modulus (Gmax), the mechanical nonlinear stress-strain-strength behavior of soil manifests in the form of modulus reduction, typically expressed in normalized form as Gop/Gmax. Here, Gop is the operative shear modulus – a reduced stiffness value corresponding to strain levels that the soil is experiencing. Assessment of Gop is critical to reliable predictions of load-related deformations within the soil. Among the various categories of loading, deep foundations and pilings exhibit a typical mechanism of axial load transfer to the foundation soil. For friction type piles, the stiffness reduction mostly takes place along the pile shaft-soil interface. Within the framework of an analytical solution, the back analyses from the results of load tests on pile foundations, together with the knowledge of pile geometries and soil parameters, provide an outline for evaluation of Gop at different load increments. This paper explains the methodology employed to develop stiffness reduction curves (Gop/Gmax) as a function of pseudo-strain (γp = wt/d), where, wt = settlement at the pile top, and d = pile diameter. Algorithms that integrate the plasticity characteristics of the soil are also presented. The results afford an improved evaluation of the complete nonlinear load-settlement (Q-wt) response for pile foundations under axial loads.

Proposed Method to Determine the Flow Number in Bituminous Mixtures from Repeated Axial Load Tests

2007 ◽  
Vol 133 (11) ◽  
pp. 610-617 ◽  
Author(s):  
Adrian Ricardo Archilla ◽  
Luis G. Diaz ◽  
Samuel H. Carpenter
Keyword(s):  
Axial Load ◽  
Flow Number ◽  
Bituminous Mixtures ◽  
Load Tests
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