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- 저자 : Prachasaree, Woraphot (검색결과 4 건)
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Contact interface fiber section element: shallow foundation modeling
Limkatanyu, Suchart,Kwon, Minho,Prachasaree, Woraphot,Chaiviriyawong, Passagorn Techno-Press 2012 Geomechanics & engineering Vol.4 No.3
With recent growing interests in the Performance-Based Seismic Design and Assessment Methodology, more realistic modeling of a structural system is deemed essential in analyzing, designing, and evaluating both newly constructed and existing buildings under seismic events. Consequently, a shallow foundation element becomes an essential constituent in the implementation of this seismic design and assessment methodology. In this paper, a contact interface fiber section element is presented for use in modeling soil-shallow foundation systems. The assumption of a rigid footing on a Winkler-based soil rests simply on the Euler-Bernoulli's hypothesis on sectional kinematics. Fiber section discretization is employed to represent the contact interface sectional response. The hyperbolic function provides an adequate means of representing the stress-deformation behavior of each soil fiber. The element is simple but efficient in representing salient features of the soil-shallow foundation system (sliding, settling, and rocking). Two experimental results from centrifuge-scale and full-scale cyclic loading tests on shallow foundations are used to illustrate the model characteristics and verify the accuracy of the model. Based on this comprehensive model validation, it is observed that the model performs quite satisfactorily. It resembles reasonably well the experimental results in terms of moment, shear, settlement, and rotation demands. The hysteretic behavior of moment-rotation responses and the rotation-settlement feature are also captured well by the model.
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Total Lagrangian Formulation of 2D Bar Element using Vectorial Kinematical Description
Suchart Limkatanyu,Woraphot Prachasaree,Griengsak Kaewkulchai,권민호 대한토목학회 2013 KSCE Journal of Civil Engineering Vol.17 No.6
Based on the total Lagrangian kinematical description, a geometrically nonlinear bar element is developed for large-displacement and post-buckling analyses of plane truss structures. Firstly, the vectorial form is used to explicitly describe the element kinematics and element strain in terms of element nodal displacements, thus eliminating the need of shape functions as required in a standard finite element formulation. Secondly, the virtual displacement principle is employed to represent the element equilibrium in the integral form. Due to the nonlinear nature of the system, the directional derivative operator is used to linearize the virtual displacement equation, resulting in an incremental form of equilibrium equations. Thirdly, the generalized displacement control method is adopted in obtaining the incremental solution of problems. Finally, several structures exhibiting different types of critical points are analyzed to verify the element accuracy and assess the ability of solution algorithm to trace nonlinear responses. In this paper, the MATLAB programming language is used for coding and in-house software development.
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Suchart Limkatanyu,Paitoon Ponbunyanon,Woraphot Prachasaree,Kittisak Kuntiyawichai,권민호 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.9
A novel beam-elastic substrate element with inclusion of microstructure and surface energy effects is proposed in this paper. Themodified couple stress theory is employed to account for the microstructure-dependent effect of the beam bulk material while Gurtin-Murdoch surface theory is used to capture the surface energy-dependent size effect. Interaction mechanism between the beam and thesurrounding substrate medium is represented by the Winkler foundation model. The governing differential equilibrium and compatibilityequations of the beam-elastic substrate system are consistently derived based on virtual displacement and virtual force principles, respectively. Both essential and natural boundary conditions of the system are also obtained. Two modified Tonti’s diagrams are presented toprovide the big picture of both displacement-based and force-based formulations of the system. Due to similarity between the currentproblem and the one related to the beam on Winkler-Pasternak foundation, the so-called “natural” beam-Winkler-Pasternak foundationelement coined by the authors is employed to perform two numerical simulations to study the characteristics and behaviors of a beamsubstratesystem with inclusion of microstructure and surface effects.
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Worathep Sae-Long,Suchart Limkatanyu,Woraphot Prachasaree,Suksun Horpibulsuk,Pattamad Panedpojaman 한국콘크리트학회 2019 International Journal of Concrete Structures and M Vol.13 No.5
This paper presents and emphasizes the essence of inclusion of shear response and shear–flexural interaction in the investigation of reinforced concrete (RC) columns characterized by light and inadequately (substandard) detailed transverse reinforcement. This column type commonly exists in old-constructed RC frame buildings before the regulation of modern seismic codes. A stiffness-based RC frame element with shear–flexure interaction is formulated within the framework of Timoshenko beam kinematics assumption. Linked displacement interpolation functions are employed to remedy the problematic shear-locking phenomenon. The axial and flexural actions are interacted via the fiber-section model while shear-strength deterioration with inelastic flexural deformations is accounted for within the framework of the UCSD shear-strength model. The numerical procedure for shear–flexure interaction is modified from the Mergos–Kappos procedure. The proposed element is simple, computationally efficient and able to describe several salient features of RC columns with substandard detailed transverse reinforcement, including gradual spread inelasticity, shear–flexure coupling effects, and shear-strength deterioration with increasing curvature ductility. Three correlation studies are conducted to examine the model accuracy and its capability to predict the rather complex responses of non-ductile RC columns. Comparison with conventional flexural frame element is also presented to emphasize the essence of inclusion of shear response and shear–flexure interaction.
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