01 Jul 97
The deflection and stress are for a single pile. If a single
obtaining reliable estimates of the performance of pile
pile is analyzed with a load of 50 kips, the groudline
groups. Several computer programs can assist the analysis
deflection was 0.355 inch and the bending stress was 23.1
and design of groups.
kips per square inch. Therefore, the solution with the
CPGA. Program CPGA provides a three-
imaginary large-diameter single pile was more critical.
dimensional stiffness analysis of a group of vertical and/or
5. Computer Assisted Analysis
battered piles assuming linear elastic pile-soil interaction,
a rigid pile cap, and a rigid base (WES Technical Report
A computer assisted analysis is a reasonable alternative for
ITL-89-3). Maxtrix methods are used to incorporate
position and batter of piles as well as piles of different
sizes and materials. Computer program CPGG displays
the geometry and results of program CPGA.
b. STRUDL. A finite element computer program such
as STRUDL or SAP should be used to analyze the
performance of a group of piles with a flexible base.
c. CPGC. Computer program CPGC develops the
interaction diagrams and data required to investigate the
structural capacity of prestressed concrete piles (WES
Instruction Report ITL-90-2).
d. CPGD. Computer program (Smith and Mlakar
1987) extends the rigid cap analysis of program CPGA to
provide a simplified and realistic approach for seismic
analysis of pile foundations.
Program CPGD (in
development stage at WES) includes viscous damping and
response-spectrum loading to determine pile forces and
Figure 5-10. Plan and evaluation of foundation
analyzed in example problem