Modelling the Dynamic Response of Pile Foundations in Performance Based Geotechnical Engineering Framework

Unutmaz, Berna
Gülerce, Zeynep
The objective of this study is to develop a performance-based earthquake engineering (PBEE) framework for the soil liquefaction-related hazards and estimate the levels of exceeding liquefaction related engineering demand parameters (EDPs) in a probabilistic manner. The post-cyclic lateral deformation at the pile head (x) is tried to be predicted from ground motion intensity measures (IMs) such as peak ground acceleration (PGA) and Arias Intensity (I a). Within this scope, a number of finite difference analysis using an initial subset of 10 near fault recordings (rupture distance is less than 20 km) having a large range of variability in the ground shaking levels recorded on rock sites have been performed. The soil profile is a homogenous, clean sand with a shear wave velocity of 100 m/sec. Results of the analysis are presented in terms of EDP vs. peak ground acceleration (PGA) and EDP vs. Arias Intensity (I a) plots. The results showed that, the lateral deformation at the pile tip is non-linear. Instead a logarithmic function that can accommodate the non-linearity of this relation is preferred in developing the seismic demand models. It should be kept in mind that these analyses are performed for a limited number of analysis and do not reflect the generalized solution.