Report No.: CCEER-94-2
Stiffness Evaluation of Pile Foundation of Cazenovia Creek Overpass
Authors: Bruce Douglas, Emmanuel Maragakis, and Shiping Feng
Date: March 1994
- Prepared for the:
- National Center for Earthquake Engineering Research
- National Science Foundation
- New York Department of Transportation
- Performing Organization:
- Department of Civil Engineering/258
- University of Nevada, Reno
- Reno, NV 89557
- A detailed study of a typical foundation of the southbound lane of the Cazenovia Creek
Expressway was carried out and is described in this report. A 3-dimensional finite element
model of the pier bent foundation was developed. The results presented in this report
relate to the longitudinal lateral stiffness and the transverse lateral and rotation
stiffnesses of the pier bent foundation.
- An equivalent linear iterative procedure was used to determine the foundation stiffness.
Three loading cases were used in the study. The first case was a lateral load applied to
the longitudinal direction of the foundation and the other two cases were lateral load and
couple loading applied to the transverse direction of the foundation. Six lateral load
levels and five couple levels were used in the calculation.
- The lateral load versus displacement curves in both the longitudinal and the transverse
direction showed the nonlinear behavior of the foundation due to increasing the loads. The
soil above the pile cap had the significant influence on the deformation and the stiffness
of the foundation in the longitudinal direction. The deformation of the foundation model
without the soil above the pile cap was larger than the model with the soil above the pile
cap. Based on the evaluation of the foundation stiffnesses, simplified foundation models
are proposed for the earthquake analysis of the bridge model system in the longitudinal
and transverse direction (Abstract by authors).