SEISMIC ASSESSMENT OF BUILDINGS ON CAST IN PLACE PILES WITH RIGOROUS MODELLING OF SOIL-PILE-STRUCTURE INTERACTIONS

Date

2025-2-27

Author

Özgenoğlu, Müge

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Construction of pile-supported high-rise buildings and large-span bridges has been steadily increasing due to rising demands in housing and transportation. Consequently, understanding the response of pile foundations under dynamic loads has become an important issue in the design of many structures. Modeling and the analysis of the soil-pile-structure systems with the consideration of SSI effects is a demanding task. Material nonlinearities of soil and structural elements, cyclic effects on the soil and pile group effects should be considered for realistic simulations. The application of the seismic loads, while considering these issues, is also a significant challenge for the dynamic analysis of the pile-supported structures. Given the challenges in these simulations, the design and assessment of these structures are generally conducted with force-displacement curves representing equivalent soil behavior in static and dynamic analysis. The kinematic and inertial interaction are considered with approximate techniques. Modeling this complex behavior with simplified sub-structuring for kinematic and inertial interactions requires a set of assumptions. The implications of these assumptions and simplified modeling techniques on the demand predictions for the pile and superstructure are also not clear. The goal of this study is to explore the dynamic behavior of a typical building structure supported by pile foundations, with a focus on soil-structure interaction (SSI) effects, and to extract practical insights from the results. A detailed 3D soil-pile (and structure) continuum model is used to simulate the response of these systems under dynamic loads. Soil medium, multiple piles and 2D frame structure are modeled together simulating the complex nonlinearity, including cyclic effects and residual displacements. The seismic loads are applied to the system using a local domain decomposition technique proposed by Lokke and Chopra (2018). The soil, pile group and the superstructure is modelled with different modeling approaches as linear, nonlinear alternatives. The demands on the pile and structure are then derived from a series of seismic analyses and compared to assess the impact of different modeling approaches.

Subject Keywords

Pile Foundations, PSoil Structure Interactions, Nonlinear Dynamic Analysis

URI

https://hdl.handle.net/11511/114107

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Graduate School of Natural and Applied Sciences, Thesis