A Framework for 3D Nonlinear Ground-Foundation Analysis

Three-dimensional nonlinear finite element simulations are becoming increasingly feasible for transportation geotechnical applications. This paper presents a robust and versatile framework that helps streamline the use of finite elements for seismic response of soil-structure systems. In this regard, a Windows-based graphical-user-interface OpenSeesPL is developed for pile-ground interaction analyses. Particularly suited to seismic applications, the open-source computational platform OpenSees is employed throughout. OpenSeesPL allows convenient studies of three-dimensional seismic (earthquake) and/or push-over pile analyses. Various ground modification scenarios may be also addressed by appropriate specification of the material within the pile zone. To illustrate the capabilities of OpenSeesPL, two studies are presented in this paper. Lateral spreading effects on pile foundations are modeled, followed by an investigation of ground remediation in a mildly sloping silt stratum. Along with the insights gained from these studies, the reported effort aims to highlight the analysis framework capabilities and range of potential applications.