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Regular truss structure model equivalent to continuum structure

International Journal of Agricultural and Biological Engineering 2015年第5期8卷 151-161页

作者： Won Choi JeongJae Lee seongsoo yoon Department of Rural Systems Engineering College of Agriculture and Life SciencesSeoul National UniversitySeoul 151-921South Korea Department of Rural Systems Engineering Research Institute of Agriculture and Life SciencesCollege of Agriculture and Life SciencesSeoul National UniversitySeoul 151-921South Korea Department.of Agricultural and Rural Engineering College of AgricultureLife and Environments SciencesChungbuk National UniversityChungbuk 362-763South Korea

It is difficult to solve the structural problems related to agricultural engineering,due to the wide ranges of the means of related variables and complex structural *** these reasons,discrete models are required that are able to replace or simplify solid structure components used in traditional analysis ***,the objective of this study was to develop a regular truss structure model that behaves the same way as a solid *** was assumed that if a unit element consists of truss elements with each hinge at the end of the element and the size of the element is infinitesimal,the stress distribution and displacement field will be constant throughout the domain of the unit ***,the behavior of the truss element was assumed to be in a linear state in a two-dimensional *** law of energy conservation,based on the theory of elasticity,was applied to determine the equilibrium conditions between discretized and solid *** restrictive condition that we obtained revealed that applications are limited to only ideal elastic materials with a Poisson’s ratio of 1 to *** volumetric ratio of the equivalent truss to the continuum structures was 3:1,regardless of the size or number of the *** calculate the internal stress and strain of the unit element,the geometric relationships of each truss member,which has its own role against different stress directions,were *** calculated von Misses stresses were used to verify this *** concentrations,as explained based on Saint Venant’s principle,were also observed in the equivalent truss structure *** main stress paths,indicating the areas where reinforcement bars should be placed,were successfully shown without the requirement that each element be transformed in the direction of principal stress;this was done by eliminating elements with only compressive and near-zero stresses.

关键词： structural analysis regular mesh equivalent truss structure model discretized element energy method

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Crack simulation and probability analysis using irregular truss structure modeling equivalent to a continuum structure

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International Journal of Agricultural and Biological Engineering 2017年第1期10卷 234-247页

作者： Won Choi seongsoo yoon JeongJae Lee Dept.of Rural Systems Engineering College of Agriculture and Life SciencesSeoul National UniversitySeoul 151-921South Korea Dept.of Agricultural and Rural Engineering College of AgricultureLife and Environments SciencesChungbuk National UniversityChungbuk 362-763South Korea Dept.of Rural Systems Engineering Research Institute of Agriculture and Life SciencesCollege of Agriculture and Life SciencesSeoul National UniversitySeoul 151-921South Korea

The problems related to agricultural structure engineering for crack simulation and reliability analysis are complicated because its variables contain wide ranges of mean and standard *** paper describes an integrated model to perform crack simulation and reliability analysis of a continuum *** structure is assumed to be under a two-dimensional plane stress and the deformation is infinitesimal.A truss structure model that has the same behaviour as a continuum structure was developed using irregular triangle truss components where each element consists of two hinges with an axial degree of freedom at both of their ends.A Monte-Carlo simulation(MCS)was adopted for the reliability *** the length of one side of the irregular triangle mesh is shorter than the thickness of the structure,the slenderness associated with compressive failure needs to be examined only for the short *** that reason,the failure criterion suitable for the equivalent truss structure model was established by checking only axial stresses acting on truss *** nodes of the equivalent truss structure model for the structural analysis in this study consist of hinges,development of plastic hinges that occurred during crack propagation were not considered in this *** simulate the development of crack,truss members over allowable stresses of tension or compression among truss members with the largest amount of stress at each completed structural analysis time step were sequentially *** irregular triangle meshes have an uncertainty in themselves to compare with regular meshes,the equivalent truss structure model could describe crack propagation more *** failure probabilities of structures under various loads and boundary conditions had good agreement with the analytical solutions directly solved from the limit state equations expressed in the form of moments.

关键词： crack simulation probability analysis irregular truss structure model failure criteria Monte Carlo simulation

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System reliability analysis of downstream spillways based on collapse of upstream spillways

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International Journal of Agricultural and Biological Engineering 2015年第4期8卷 140-150,I0003页

作者： Won Choi Jeongbae Jeon Jinseon Park JeongJae Lee seongsoo yoon Department of Rural Systems Engineering College of Agriculture and Life SciencesSeoul National UniversitySeoul 151-921South Korea Department of Agricultural and Rural Engineering College of AgricultureLife and Environments SciencesChungbuk National UniversityChungbuk 362-763South Korea Department of Rural Systems Engineering Research Institute of Agriculture and Life SciencesCollege of Agriculture and Life SciencesSeoul National UniversitySeoul 151-921South Korea

Some agricultural reservoirs in South Korea are vulnerable to situations in which they are unable to function as reservoirs because of essential safety *** is because 70%of existing agricultural reservoirs were originally constructed more than 50 years ago;most of these reservoirs have not been maintained or managed since their initial *** the worst cases,reservoirs are connected to one another by short distances and/or the sizes of upstream reservoirs are larger than the sizes of downstream *** components of the reservoirs,such as their embankments,spillways,and water intake facilities,have been considered in order to understand the main factors associated with potential reservoir ***,this study aims to estimate the probability of failure in downstream spillways upon the collapse of upstream spillways(for reservoirs connected in series).A simple equation to calculate the rise in the water level in downstream spillways,which is caused by the collapse of upstream spillways,was *** equation was based on the discharge equation of an overflowing rectangular weir and the scaling law for continuous *** verify the proposed simple equation,the water level increments were compared with the simulated results of the commercial software FLOW-3D,which is an accurate computational fluid dynamics(CFD)program that is used for tracking free-surface *** values predicted through the simple formula were close to the simulated data(within a maximum prediction error of 5%).The values were updated to reflect the effects of hydraulic pressures on the walls of downstream spillways,thereby allowing the failure probabilities(due to overturning,sliding,and settlement)of the downstream spillways to be *** study found that the failure probabilities of independent components in reservoirs are significantly different from the systematic failure values observed in sequential modes.

关键词： failure probability collapse spillway discharge scaling law FLOW-3D

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