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Author: search.filters.author.Prasertsri, Tosporn

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    Item type:Publication,
    Composite damage modeling of recycled aggregate concrete beam on Winkler-Pasternak foundations: A multiphase mechanical approach
    (2025-01-01)
    Limkatanyu, Suchart
    ;
    Sae-Long, Worathep
    ;
    Damrongwiriyanupap, Nattapong
    ;
    Sukontasukkul, Piti
    ;
    Phoo-Ngernkham, Tanakorn
    This paper proposes a new recycled aggregate concrete (RAC) beam model on a foundation that incorporates damage. The damage models are derived based on composite damage mechanics, considering three phases: cement paste, recycled concrete aggregate (RCA), and nano inclusions. Three damage models are used to represent damage in the RAC beam: the Voigt parallel model, the Reuss serial model, and the generalized self-consistent model. The Voigt parallel model represents the upper bound responses, while the lower bound responses are represented by the Reuss serial model. The beam model is developed using the virtual displacement principle, with the kinematic assumption based on Euler-Bernoulli beam theory. The Winkler-Pasternak foundation model is employed to account for the interaction between the beam and foundation. Two numerical simulations were conducted to investigate the effects of damage and system parameters on static bending analysis. Both simulations reveal that damage parameters lead to a degradation of system stiffness, resulting in increased beam deflection. Conversely, the foundation parameters increase system stiffness, leading to a reduction in beam deflection.
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    Fem-pgd based technique for column shape optimization against buckling
    (2021-10-01)
    Prasertsri, Tosporn
    ;
    Sartbumrung, Supin
    ;
    Suewongprayoon, Suneenut
    ;
    Sinsamutpadung, Natdanai
    ;
    Rungamornrat, Jaroon
    This paper presents a simple numerical procedure based upon the projected gradient descent (PGD) and finite element method (FEM) for the shape optimization of laterally restrained columns to attain the maximum elastic buckling load under the specified volumetric constraint. The analysis of the buckling load is achieved via the formulation based on Euler-Bernoulli beam theory, the discretization by the standard finite element technique, and the determination of the least eigenvalue and the corresponding eigenvector via the power method with Rayleigh quotient. In the optimization, the profile of the cross-sectional area of the column is represented by piecewise polynomial interpolation functions. The gradient information and the projection operator required in PGD iterations are obtained explicitly in a closed form. A selected set of results is reported to demonstrate not only the good convergence behavior and accuracy of numerical solutions, but also the capability of the proposed technique to attain the optimal shape of columns for various scenarios.