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Development of simulation techniques for dynamic soil-structure interaction applied to the modeling of the foundation response of Nano-Facilities and synchrotron light laboratories, phase 2

Grant number: 15/00209-2
Support type:Scholarships abroad - Research Internship - Post-doctor
Effective date (Start): March 01, 2015
Effective date (End): August 31, 2015
Field of knowledge:Engineering - Mechanical Engineering - Mechanics of Solids
Principal Investigator:Euclides de Mesquita Neto
Grantee:Josué Labaki Silva
Supervisor abroad: Nimal Rajapakse
Home Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Local de pesquisa : Simon Fraser University, Canada  
Associated to the scholarship:12/17948-4 - Development of Simulation Techniques for Dynamic Soil-Structure Interaction Applied to Modeling of the Foundation Response of Nano-Facilities and Synchrotron Light Laboratories, BP.PD

Abstract

The present post-doctoral work addresses the development of a series of numerical models to describe the dynamic response of circular or annular foundations interacting with distinct soil profiles. This work is motivated by the necessity to model and understand the dynamic behavior of foundations of the kind that are being designed for the new Brazilian Synchrotron Light Source, the Sirius Project. The limits of vibrations amplitudes required for the proper operation of the synchrotron light rings are very demanding and a proper understanding of their underlying foundation dynamics is fundamental to the success of the project. The present BEPE internship comprises the formulation of models of the vibration of piles and large pile groups. This is a fundamental component of this research program, since currently the leading design of the foundation of a synchrotron light source is characterized by a circular foundation resting on a very large group of piles. First, the author will formulate a simplified 1D pile model to represent wave scattering properties as if the pile was a line within the soil. An assessment of the conditions in which these assumptions are reasonable must be done. Prof. Rajapakse's experience at this step will be crucial to keep any relevant characteristic of the problem to be overlooked. He will be able to formulate the proper tests that must be conducted to verify the accuracy of the new 1D model. Next, the work will progress to the study of two piles interacting with each other. This model can be compared with other sources from the literature for the limiting cases of long piles, rigid piles and under static loading. The general case of long or short, rigid or elastic piles that properly take into account the inertia effects of the pile-soil system can currently only be properly obtained with the model proposed in the literature by Prof. Rajapakse, the supervisor abroad. At this point, it is not completely understood which of these effects are relevant or not in the two-pile interaction. This will enable the author to understand the most important parameters that govern the two-pile interaction problem and will provide insights that are essential for the next step. Finally, the next extension of the model is the study of a large group of piles. The model will account for the wave scattering and energy absorption properties of each pile acting individually or in a group. It will consider their surrounding media as transversely isotropic, layered media, for an accurate representation of the soil. Unlike a Finite Element model, this model will be able to comply with Sommerfeld's radiation condition of unbounded media. Unlike a full-scale Boundary Element model, this model will be computationally efficient. (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DAMASCENO, D. A.; MESQUITA, E.; RAJAPAKSE, R. K. N. D.; PAVANELLO, R. Atomic-scale finite element modelling of mechanical behaviour of graphene nanoribbons. INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN, v. 15, n. 1, p. 145-157, MAR 2019. Web of Science Citations: 0.
DAMASCENO, D. A.; MESQUITA, E.; RAJAPAKSE, R. N. K. D. Mechanical Behavior of Nano Structures Using Atomic-Scale Finite Element Method (AFEM). LATIN AMERICAN JOURNAL OF SOLIDS AND STRUCTURES, v. 14, n. 11, p. 2046-2066, 2017. Web of Science Citations: 0.

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