• Journal of the Korea Concrete Institute
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• v.17 no.6 s.90
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• pp.1053-1064
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• 2005

The mechanical damage of concrete is normally attributed to the formation of microcracks and their propagation and coalescence into macroscopic cracks. This physical degradation is caused from progressive and hierarchical damage of the microstructure due to debonding and slip along bimaterial interfaces at the mesoscale. Their growth and coalescence leads to initiation of hairline discrete cracks at the mesoscale. Eventually, single or multiple major discrete cracks develop at the macroscale. In this paper, from this conceptual model of mechanical damage in concrete, the computational efforts were made in order to characterize physical cracks and how to quantify the damage of concrete materials within the laws of thermodynamics with the aid of interface element in traditional finite element methodology. One dimensional effective traction/jump constitutive interface law is introduced in order to accommodate the normal opening and tangential slips on the interfaces between different materials(adhesion) or similar materials(cohesion) in two and three dimensional problems. Mode I failure and mixed mode failure of various geometries and boundary conditions are discussed in the sense of crack propagation and their spent of fracture energy under monotonic displacement control.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.22 no.6
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• pp.527-532
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• 2009

In this paper simulations for the impact into ceramics and/or metal materials have been discussed. To model discrete nature for fracture and damage of brittle materials, we implemented cohesive-law fracture model with a node separation algorithm for the tensile failure and Mohr-Coulomb model for the compressive loading. The drawback of this scheme is that it requires a heavy computational time. This is because new nodes are generated continuously whenever a new crack surface is created. In order to reduce the amount of calculation, parallelization with MPI library has been implemented. For the high-speed impact problems, the mesh configuration and contact calculation changes continuously as time step advances and it causes unbalance of computational load of each processor. Dynamic load balancing technique which re-allocates the loading dynamically is used to achieve good parallel performance. Some impact problems have been simulated and the parallel performance and accuracy of the solutions are discussed.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.285-285
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• 2018

하천에서 부유사의 형태로 이송되는 점착성 유사는 입자 표면의 전자기적 점착력의 영향과 하천의 흐름 및 난류에 의하여 지속적인 응집과 파괴의 과정인 응집현상을 겪는다. 이러한 응집현상을 통해 플럭을 형성한 점착성 유사의 크기 및 밀도는 끊임없이 변화하며 침강속도 역시 변화한다. 점착성 유사의 이동을 예측하기 위해서는 유사의 부유에 직접적으로 관계하는 침강속도를 이해하는 것이 중요하며 많은 연구에서 점착성 유사의 농도와 침강속도의 관계를 그래프로 보여주고 있다. 일반적으로 그래프에서 침강속도는 처음에 농도가 증가할수록 증가하는 비례 관계를 보여주다가 농도가 어느 정도를 넘어 더 증가하게 되면 감소하여 반비례하는 모양을 그리고 있다. 또한 연구들은 농도와 침강속도 두 관계가 분명한 멱함수법칙(Power Law)을 가진다고 언급하고 있다. 그러나 이전의 연구에서는 그래프가 보여주는 두 관계의 분석이나 메커니즘에 대해 중점을 두고 논의된 바가 없다. 본 연구는 점착성 유사의 응집현상과 이동을 모의하는 1차원 연직 수치모형으로 수치 실험을 실시하고, 그 결과를 바탕으로 농도와 침강속도가 갖는 관계를 면밀히 분석한다. 플럭의 크기 및 농도는 유사의 부유를 결정하는 침강속도와 매우 밀접한 관련이 있는 특징이며 특히 플럭의 크기는 침강속도를 결정한다. 즉 플럭의 크기와 농도가 갖는 관계가 침강속도와 농도가 갖는 관계에 크게 관여할 것으로 예측된다. 앞서 언급한 연구들의 그래프에서 비례 관계를 갖는 구간은 일반적으로 수면과 가까우며 농도와 크기가 비례하는 경향을 보이며 반비례하는 구간은 농도가 크고 난류가 강한 하상부근으로 두 관계가 반비례하는 경향이 밝혀진 연구가 있다. 점착성 유사의 농도 및 플럭의 크기가 이러한 경향을 띠는 것은 하상부근에서는 난류 전단과 그에 따른 플럭의 파괴와 응집의 결과로 나타나는 응집현상과 관련이 있으며 이러한 결과들을 바탕으로 점착성 유사의 침강속도와 농도가 가지는 관계를 분석한다.

• Coupled systems mechanics
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• v.7 no.6
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• pp.649-668
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• 2018

In this paper, we present a numerical model for fluid-structure interaction between structure built of porous media and acoustic fluid, which provides both pore pressure inside porous media and hydrodynamic pressures and hydrodynamic forces exerted on the upstream face of the structure in an unified manner and simplifies fluid-structure interaction problems. The first original feature of the proposed model concerns the structure built of saturated porous medium whose response is obtained with coupled discrete beam lattice model, which is based on Voronoi cell representation with cohesive links as linear elastic Timoshenko beam finite elements. The motion of the pore fluid is governed by Darcy's law, and the coupling between the solid phase and the pore fluid is introduced in the model through Biot's porous media theory. The pore pressure field is discretized with CST (Constant Strain Triangle) finite elements, which coincide with Delaunay triangles. By exploiting Hammer quadrature rule for numerical integration on CST elements, and duality property between Voronoi diagram and Delaunay triangulation, the numerical implementation of the coupling results with an additional pore pressure degree of freedom placed at each node of a Timoshenko beam finite element. The second original point of the model concerns the motion of the outside fluid which is modeled with mixed displacement/pressure based formulation. The chosen finite element representations of the structure response and the outside fluid motion ensures for the structure and fluid finite elements to be connected directly at the common nodes at the fluid-structure interface, because they share both the displacement and the pressure degrees of freedom. Numerical simulations presented in this paper show an excellent agreement between the numerically obtained results and the analytical solutions.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.30 no.4D
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• pp.387-393
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• 2010

This paper studies static crack growth of asphalt pavement using the extended finite element method (XFEM). To consider nonlinear characteristics of asphalt concrete, a viscoelastic constitutive equation using the Maxwell chain is used. And a linear cohesive crack model is used to regularize the crack. Instead of constructing the viscoelastic constitutive law from the Prony approximation of compliance and retardation time measured experimentally, we use a smooth log-power function which optimally fits experimental data and is infinitely differentiable. The partial moduli of the Maxwell chain from the log-power function make analysis easy because they change more smoothly in a more stable way than the ordinary method such as the least square method. Using the developed method, we can simulates the static crack growth test results satisfactorily.

• Journal of the Korea Institute of Building Construction
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• v.24 no.1
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• pp.145-156
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• 2024

In an era where construction projects are becoming increasingly large and complex, the Korean construction industry faces the challenge of implementing systematic and cohesive schedule management practices. This study initially delineates the concept of schedule management capabilities, systematically categorizing them into five distinct domains: law and regulations, requirements of project owners, capabilities of professionals and organizations, task capability, and the adoption of smart construction technologies for schedule management. Through a survey targeting industry professionals, this research assesses the perceived importance and the actual proficiency level in schedule management across these categories, employing an Importance Performance Analysis(IPA) to scrutinize these capabilities. The findings underscore the acknowledged significance of diverse aspects of schedule management, yet reveal discrepancies between the current proficiency levels and their perceived importance, pinpointing areas necessitating enhancement. Critical improvement needs identified encompass the planning of budgets for schedule management, development of regulations for assessing construction periods, deployment of specialized on-site staff for schedule management, and investment in advanced schedule management software solutions. Consequently, this study offers a nuanced analysis and strategic insights for enhancing schedule management practices, aiming to facilitate their effective implementation in the field.