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  • Nov
    13

    SPREE Seminar: Madura Pathirage

    McCormick - Civil and Environmental Engineering

    11:00 AM A230, Technological Institute

    EVENT DETAILS

    Automatic Identification of the Lattice Discrete Particle Model Parameters

    Abstract
    Madura Pathirage is a fifth-year Ph.D. candidate of civil engineering within the Mechanics of Quasi-Brittle Materials group led by Professor Gianluca Cusatis, here at Northwestern University. He obtained a Bachelor and a Master's Degree in structural engineering from Ecole Spéciale des Travaux Publics, du Bâtiment et de l'Industrie, France, and a Master of Science in mechanics of materials and solids from Northwestern University. Prior to joining NU, he worked in the field of asphalt testing and modeling, in the research and development departments of LafargeHolcim and Eiffage Travaux Publics (France). His current research interests lie in formulating and validating multi-scale and multi-physics models for the characterization of concrete behavior, based on both experimental work and computational mechanics. In particular, he studies concrete deterioration due to alkali-silica reaction, cement hydration and aging process in concrete, and model calibration with inverse-optimization algorithms. His research also focuses on developing random fields models for concrete, modeling fiber-reinforced concrete, and scratch tests on quasi-brittle materials. He is also involved in a few other research projects including modeling irregular masonry structures and reinforced concrete shear walls, and developing 3-D printing techniques for sulfur concrete.

    Bio
    Model predictions depend largely on the accuracy and robustness of the model itself. The formulations of physics-based models and the well-posedness of the relevant parameter identification are crucial and must be investigated. In order to provide a reliable numerical tool for researchers and engineers, a systematic optimization approach was developed to identify model parameters based on experimental data. This algorithm was successfully implemented and applied to the inverse analysis of concrete mechanical behavior using the Lattice Discrete Particle Model (LDPM). Different optimization schemes tailored to the analyzed problem were evaluated using the numerical response of LDPM as experimental results (pseudo-data), and the robustness of the identification program was demonstrated through the optimization of the LDPM fracture parameters based on typical concrete fracture tests. The method was then applied to actual experimental fracture data with decreasing levels of information. Furthermore, the LDPM response in compression under low and high confinements was analyzed through its dedicated constitutive equations for cohesive and frictional shearing, and nonlinear compressive behavior with strain-hardening. A model selection was finally performed by gradually increasing the number of LDPM meso-level parameters, necessary to carry out the inverse analysis with reference to actual confinement data.

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    TIME Wednesday, November 13, 2019 at 11:00 AM - 12:00 PM

    LOCATION A230, Technological Institute    map it

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    CONTACT Tierney Acott    tierney-acott@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering

  • Sep
    16

    Fall classes begin 8 a.m.

    University Academic Calendar

    All Day

    EVENT DETAILS

    TIME Wednesday, September 16, 2020

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    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Oct
    24

    CEE Fall 2020 Career Fair

    McCormick - Civil and Environmental Engineering

    1:00 PM TBD, Technological Institute

    EVENT DETAILS

    TIME Saturday, October 24, 2020 at 1:00 PM - 4:00 PM

    LOCATION TBD, Technological Institute    map it

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    CONTACT Tierney Acott    tierney-acott@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering