포화된 다공성매체에서 파동의 전파특성 I. 이론해의 유도

김선훈,김광진,Kim, Sun-Hoon,Kim, Kwang-Jin 한국전산구조공학회 2007 한국전산구조공학회논문집 Vol.20 No.2

An analytical closed-form solution for wave propagation velocity and damping in saturated porous media is presented in this paper The fully coupled field model with compressible solid Brains and pore water were used to derive this solution. An engineering approach for the analysis of fully saturated porous media was adopted and closed-form solutions for one dimensional wave propagation in a homogeneous domain were derived. The solution is highly versatile in that it considers compression of the solid grains, compression of the pore water, deformation of the porous skeleton, and spatial damping and can be used to compute wavespeeds of first and second kind and damping coefficients in various geologic materials. This solution provides a means of analyzing the influence of material property variations on wavespeed and attenuation. In Part 2 of this work the theoretical solution is incorporated into the numerical code and the code is used in a parametric study on wave propagation velocity and damping.

포화된 다공성매체에서 파동의 전파특성 II. 파라미터 연구

김선훈,김광진,Kim, Sun-Hoon,Kim, Kwang-Jin 한국전산구조공학회 2007 한국전산구조공학회논문집 Vol.20 No.2

The general theoretical solutions for the wavespeed and damping derived in Part 1 of this work, are incorporated into the computer code. In this paper the code is used in a parametric study of the influence of excitation frequency and variations in material properties on propagation velocity and damping. Compressional wave velocity for waves of the first kind is shown to vary as a function of the frequency-permeability product, with a zone where wavespeed transitions from a lower bound value to a higher bound value with increasing values of the product. Damping is seen to be a maximum where the rate of change in wavespeed is greatest. Waves of the second kind also show a transition in wavespeed from near zero at low values of the frequency-permeability product to an upper bound value at higher values of the product.

원자로 격납건물의 3차원 구조해석시스템

김선훈,Kim, Sun-Hoon 한국전산구조공학회 2010 한국전산구조공학회논문집 Vol.23 No.2

Three-dimensional structural analysis system for nuclear containment building is presented in this paper. This system includes high-performance plate/shell elements as finite element library. It also adopts numerical modeling technique for unbonded tendon as well as bonded tendon in prestressed concrete structures. This system is constructed by connecting several in-house program to a commercial program DIANA, and then is capable of performing nonlinear analysis for ultimate pressure capacity of nuclear containment building. Finally, three-dimensional structural analysis of CANDU-type containment building is carried out in order to test the reliability of this system. These numerical results are compared with reference values, which obtained from axisymmetric structural analysis.

CANDU형 원자로 격납건물의 극한내압능력 평가에 관한 연구

김선훈,Kim, Sun-Hoon 한국전산구조공학회 2011 한국전산구조공학회논문집 Vol.24 No.3

Nuclear containment building is the last barrier for being secure from any nuclear power plant accident. Therefore, it is very important to understand the ultimate capacity of nuclear containment building to loads associated with severe accidents. LOCA (loss of coolant accident) is considered as the basic accidental load and CANDU-type containment building is considered as a target structure in order to conduct the numerical analysis for the structural safety of a containment building. The CANDU-type containment building is a prestressed concrete shell structure which has the dome and the cylindrical wall and is reinforced with bonded tendons. In this paper, the evaluation of ultimate internal pressure capacity was carried out by nonlinear analysis of a prestressed concrete containment building using 3-dimensional structural analysis system.

사일로 구조형식 중저준위 방폐물 처분동굴의 유한요소 해석

김선훈,김광진,Kim, Sun-Hoon,Kim, Kwang-Jin 한국전산구조공학회 2021 한국전산구조공학회논문집 Vol.34 No.5

본 논문에서는 우리나라의 중저준위 방폐물 처분을 위한 사일로 형식 지하동굴의 유한요소해석을 수행하였다. 사일로의 벽체부분은 지름 25m의 원형구조이고, 높이는 35m이다. 사일로의 천장부분은 지름 30m의 돔 형식이고, 높이 17.4m의 규모이다. 사일로는 해수면으로부터 -80m에서 -130m에 위치하고 있다. 중저준위 방폐물 처분 1단계 시설로 6개의 사일로가 건설되어 운영되고 있으나, 본 연구에서는 1개의 사일로에 대해서 고려하였다. SMAP-3D 프로그램을 사용하여 2차원 축대칭 유한요소모델과 3차원 유한요소모델을 생성하였다. Generalized Hoek and Brown Model이 수치해석에 적용되었다. 다양한 측압계수(수평방향 현장응력과 수직방향 현장응력의 비)의 변화에 따른 사일로 형식 지하동굴의 유한요소해석을 수행하였으며, 수치해석결과 및 분석결과가 제시되었다.

시공단계별 영향을 고려한 터널 전력구의 유한요소해석

김선훈,Kim, Sun-Hoon 한국전산구조공학회 2013 한국전산구조공학회논문집 Vol.26 No.2

In this paper structural analysis of underground electrical power cable structures which is excavated below the surface of the earth in the downtown area is carried out considering the effect of construction sequence. There are many various life-line facilities below the surface of the earth in the downtown area. MPDAP was used for finite element analysis of underground electrical power cable structures. Three typical sections are simulated by finite element models. Unbalanced equilibrium problems may be occurred when conventional finite element procedures were used for simulation of tunnel excavation. Therefore equilibrium perturbation concept was applied to solve these problems. The effects of time-dependent deformations in advancing tunnel excavation are considered in the stages of construction sequences as using the load distribution factor. It is shown that values of maximum displacement of both soil and rock surrounding underground electrical power cable structures obtained by our numerical studies are less than allowable values.

사각 개구부의 개수와 보강 형태에 따른 보-기둥 접합부의 내진 성능에 관한 연구

김선훈(Kim, Sun-hoon),오근영(Oh, Keunyeong),조민주(Jo, Min-ju),이강민(Lee, Kangmin) 한국강구조학회 2021 한국강구조학회 학술대회 발표집 Vol.32 No.1

대형보에 웨브 개구부를 갖는 보-기둥 접합부의 유한요소해석

김선훈(Kim, Sun-Hoon),오근영(Oh, Keunyeong),이강민 대한건축학회 2020 대한건축학회 학술발표대회 논문집 Vol.40 No.2

웨브에 개구부가 있는 대형 철골 모멘트골조의 유한요소해석

김선훈(Kim, Sun-hoon),오근영(Oh, Keunyeong),허유빈(Heo, Yubin),이강민(Lee, Kang-min) 대한건축학회 2021 대한건축학회 학술발표대회 논문집 Vol.41 No.2

The purpose of this study is to evaluate the structural performance of beam-column steel connections in deep beams with different beam depths and web through modeling through finite element analysis (FEA). The overall hysteresis curves and buckling shape were deemed to be similar. For webs with openings, we confirmed that stress was concentrated around the opening of the web, and we observed the deformation of the flange and the web at that point. The beam model with a rectangular web opening showed the highest equivalent plastic strain (PEEQ) values at the end of the beam, whereas the one with a circular opening showed the highest PEEQ values around the web opening. All samples satisfied the performance requirements outlined by Korea Design Standard (KDS) and Special Moment Frame (SMF). In addition, creating plastic hinges through web openings was deemed suitable.

대형 H형강 웨브에 사각 개구부를 갖는 보-기둥 접합부의 내진성능평가

김선훈(Kim, Sun-hoon),오근영(Oh, Keunyeong),강창훈(Kang, Chang-Hoon),박관식(Park, Kwan-Sik),이강민(Lee, Kangmin) 대한건축학회 2022 대한건축학회논문집 Vol.38 No.5

This study aimed to evaluate the seismic performance of deep steel beams with rectangular openings. Test results showed that beam flange yielding was initially observed at a 1.5% story drift ratio, and this was followed by web yielding at a 2%~3% story drift ratio for most specimens. Then, beam flange buckling was observed at 3%~4%, followed by lateral torsional buckling. All specimens were tested until they reached a 6% story drift ratio, and at this stage, beam flange fracture was observed for specimens with a single rectangular opening. Normalized moment and total plastic rotation of beams with double rectangular openings showed a higher capacity when compared with those of solid specimens. All specimens were found to have the seismic performance of Special Moment Frames as specified by the steel structure Korea Design Standards.