Tutorial 2 shows you how to construct a load vs displacement curve for a single pile, using Fleming’s hyperbolic analysis, described in his 1992 Géotechnique paper “A new method for single pile settlement prediction and analysis” (see vol. 42, no. 3, pp 411-425). This tutorial demonstrates how to setup a calculation in Repute without using the program’s built-in wizards, thereby showing you how versatile the program’s user interface is.
The worked example is taken from Figure 6 in Fleming’s paper (referenced above), which is based upon from tests carried out at Wembley by Whitaker & Cooke. We are interested in replicating the load vs displacement curve given by Fleming’s analysis.
Ground conditions at the site are not given in the paper, so we will assume 25m of London Clay with an undrained strength of 100 kPa and an angle of shearing resistance of 23̊.
The pile studied is a 12.2 m long, 775 mm diameter bored pile made of concrete with Young’s modulus equal to 19.5 GPa.
A vertical load of 200 tonnes (approximately 2000 kN) is applied at the centre of the pile.
The ultimate load that the pile can carry has been calculated (separately) as 1994 kN on the shaft and 1002 kN from the base. The soil modulus below the pile base is 33.125 MPa. Other parameters used by Fleming are the shaft flexibility factor (0.0017 or 0.17%) and effective column length factor (0.45).
This tutorial is written for users of the Standard, Enterprise, and Trial Editions of Repute 2 only. Users of the Professional Edition should look at Tutorials 4-6.
In Step 1, you will enter project information about the site and the Engineer.
In Step 2, you will define the site’s ground conditions.
In Step 3, you will create a bored pile and specify its cross-section and concrete grade.
In Step 4, you will create the force applied to the pile.
In Step 5, you will sleeve the pile through the made ground.
In Step 6, you will create the scenario and calculation and link various items together.
In Step 7, you will perform the calculation and produce a report showing the relationship between load and displacement.
In Step 8, you will close (and optionally save) the project.
If Repute is not already running, double-click on the Repute icon on Windows’ Desktop to start the program. Once the splash screen has disappeared, Repute displays its Welcome page.
If you have an existing project open, click Close on the program’s Application menu. (You will be prompted to save your work if you have not already done so.)
Now you are ready to start the tutorial.
Step 1 - create the project information