구조 모델링 과정에서 발생하는 오류들에 관한 연구

양회진 호남대학교 산업기술연구소 2003 산업기술연구논문집 Vol.11 No.-

민들린 판의 좌굴에 관한 연구

梁會眞 호남대학교 1991 호남대학교 학술논문집 Vol.12 No.2

Generally the problem of plate buckling has been analysed on the basis of the thin plate theory which implies the neglect of transverse shear effects but the use of this theory can be lead to inaccuracy in other situation where the plate is not truely thin. In the research, the buckling equation is derived by minimum potential energy method according to Mindlin plate theory which implies the transverse shear effects. For approximate method, Rayleigh-Ritz method are adopted to derive eigenvalue problem in the thick plate buckling equation, and Jacobian method are used to solve this eigenvalue problem.

有限要素法에 의한 補强된 보의 橫挫屈解析에 관한 硏究

양회진 호남대학교 산업기술연구소 1996 산업기술연구논문집 Vol.3 No.-

일반적으로 철골구조에서 사용되는 보의 許容耐力은 橫挫屈 현상에 의해 결정된다. 그러므로 보의 耐力을 증가시키기 위하여 보의 압축플랜지를 가새등을 시용하여 橫拘束하여 보강하는 방법을 사용하거나, 또는 스티프너나 베튼플레이트등을 사용하여 보의 斷面性能을 부분적으로 증가시키는 방법등을 사용하여 橫挫屈補强을 하게 된다. 이 연구에서는 보가 中間拘束材에 의해 橫補强된 경우 구속위치는 변화와 구속재의 剛性에 따른 횡좌굴 보강효과를 고려하여 有限要素法을 사용하여 해석하여 보강재의 위치 및 강성에 따른 좌굴내력의 증가를 분석하여, 횡좌굴의 보강이 效率性을 糾明하였다 In steel structure, the strength of steel beams are determined by its lateral buckling. So, the steel beams use to be reinforced in a variety of ways to increase their buckling strength. One method of increasing lateral buckling strength of beams is the partial reinforcement with stiffener or batten plate for local increment of torional stiffness and bending stiffness, and another effective method is the intermediate restraints with bracing to reduce effective buckling length. In this study, the extended finite element method are used to investigate the efficiency of the reinforcement method of lateral buckling according to the location and the stiffness of web stiffener and bracing for I-shape steel beams with web stiffener and intermediate restraints.

황가새의 보강위치에 따른 I-형강 보의 횡좌굴내력에 관한 시험적 연구

梁會眞 호남대학교 산업기술연구소 1997 산업기술연구논문집 Vol.5 No.-

I-형 철골보는 단면의 폭에 비해 춤이 크고 스팬이 길어 이러한 부재의 허용응력은 주로 횡좌굴현상에 의해 결정된다. 그러므로 보의 내력을 증가시키기 위하여 보의 압축플랜지를 가새등을 사용하여 횡구속하여 보강하는 방법을 사용하게 된다. 그러나 실제 구조물에서는 하중의 작용방향과 보의 단부 구속상태에 따라 압축플랜지의 위치가 변화하게 되므로, 보의 횡좌굴내력의 증가를 위하여 가새를 사용하여 횡좌굴보강을 할 경우 가새의 보 단면내 위치에 따라 횡좌굴내력이 변화하게된다. 이 연구에서는 I-형보가 가새에 의해 지지된 경우 가새의 보 단면내 위치의 변화에 다른 보의 횡좌굴내력이 변화를 시험적 방법을 사용하여 분석하여 가새에 의한 횡좌굴 보강의 효율성을 규명하였다. Insteel structure, the strength of steel beams are determined by its lateral buckling. So, the steel beams use to be reinforced ina variety of ways to increase their buckling strength. One effective method of increasing lateral buckling strength of beams is the intermediate restraints with bracing to reduceeffective length. In this study, to investigate the increment of lateral buckling according to the location of the bracing experimental investigations are carried out on I-shaped steel beam with lateral bracing.

석탄회를 활용한 콘크리트의 성능에 관한 연구

조형근,양회진 호남대학교 산업기술연구소 1997 산업기술연구논문집 Vol.4 No.-

석탄화력발전과정이 부산물인 석탄회가 사용석탄량의 11∼57%로 생성됨에 따라 이의 처리비용 및 환경보전적 측면에서의 많은 문제점이 야기되고 있어 석탄회의 유효이용에 관한 연구가 절실하다. 따라서 본 연구에서는 석탄회를 콘크리트 혼화재로 재활용하기 위한 방안을 강구하고자 석탄회의 발생과정 및 종류, 물리적 및 화학적 특성, 재활용 현황등을 파악하고, 석탄회의 배합혼입률에 따른 콘크리트 재령별 압축강도 특성에 대한 실험연구를 수행하였다. During combustion of powdered coal in modern power plant, coal ash is produced by 11∼57% of resource coal. The coal ash requires a great deal of disposal expense and causes a number of probrems in environmental conservation. It is necessary that researches for utilization of fly ash are required as soon as possible. The goal of this study are to develop a methodology for the utilization of fly ash as a mineral admixture in concrete. This paper presents the performance of concrete using fly ash. Results of the experimental study indicates that fly ash concrete tend to reduce the early compressive strength up to 28 days, but improve the long term compressive strength.

지진하중을 받는 벽식구조의 인방보의 효과에 관한 연구

양회진 호남대학교 산업기술연구소 1999 산업기술연구논문집 Vol.7 No.-

지진하중을 받는 벽식구조의 해석모델링시 인방보의 강성이 해석결과에 미치는 영향을 파악하기 위하여 인방보가 있는 경우와 없는 경우에 대하여 해석모델의 장변방향의 길이 및 층수를 변화시키면서 모드해석한 결과를 비교하여 지진하중을 받는 벽식구조해석시 인방보의 효과를 분석하였다. 해석모델링은 슬래브의 면내강성은 충분하여 다이아프램(Diaphram)역할을 한다고 가정하고 전단건물모델(Shear Building Model)로 하여 벽식구조의 해석에 현재 널리 쓰이고 있는 ETABS 프로그램을 사용하였다. 구조해석결과를 비교 분석한 결과 인방보를 고려할 경우 변위량은 감소하였으나 층전단력의 변화는 거의 없었다. 단변방향 횡변위에 대한 인방보의 영향은 건물의 길이가 길고 고층일 경우에 증가하였으나 장변방향의 횡변위는 구조물의 층수와 장변방향의 길이에 관계없이 40%정도 감소하였으며 층전단력도 감소하였다. In this study, to investigate the effectiveness of lintel beams of slab-wall system subjected seismic forces, modal analysis is carried out for the two cases of analytical model varing the number of its story and the longitudinal length, one has lintel beam and the other has not. The slab-wall system is modelled as shear building model considering the rigidity of the slab is enough for diaphram action, and ETABS program is used for 3-D analysis. As the results of analysis, the displacement of the model with lintel beams is less than that of the other. The effectiveness of lintel beams is increased as the increase of story and length of the analytical model for the lateral direction, otherwise for the longitudinal direction the model with lintel beams reduced the lateral displacement to 40% and the story shear is reduced regardless of its story and length.

브레스된 H-形鋼의 挫屈에 관한 硏究

梁會眞 호남대학교 1992 호남대학교 학술논문집 Vol.13 No.-

In practical, the strength of steel beams, expecially deep and long span beams, are determined by its elastic buckling strength. So, structura I members are constrained in variety ways to increase their buckling strength An effective method of constraining a member is to brace it at a point along its length. In this paper, the increase in the buckling strength of columns and beams with intermediate restraints have been studied. The minimum value of restraint stiffnesses required to cause a column or beam to buckled in its second mode have been determined. The effectiveness of acting point of translational restraint and the ratio of translational stiffness to rotational stiffness is studied by closed from solution for column with translational restraints and for beam with translational restraints and rotational restraints in equal and opposite moment.

병원건축의 내진설계에 관한 연구

양회진 호남대학교 산업기술연구소 2005 산업기술연구논문집 Vol.12 No.-

建築物의 構造的 破壞分析 시스템에 관한 考察

梁會眞 호남대학교 1990 호남대학교 학술논문집 Vol.11 No.2

According to recent analysis result which was made in switzerland to deter-mine the causes of failure, although a part of the failures are due to accepted risk, most of the failures are the result of human errors. Most of the failures observed are obviously the results of incomplete safety concepts which at present as applied in structural engineering are restricted to taking into account only the damageing influence. The influence of man is not or only scarcely considered. Therefore, the failure occurence cannot be essentially reduced. The application of an improved safety concept should be able to reduce similar failures in the future. The new overall safty concept should consider not only the damaging influences, but also strategies against human errors. In this study, based on the experance of an analysis done in Switzerland, a system for a detailed analysis of structural failures fitted to this new overall satfy concept is presented.

部分 補强된 얇은판 보의 橫挫屈 近似解析法에 관한 硏究

梁會眞 호남대학교 1997 호남대학교 학술논문집 Vol.18 No.4

In this study, to investigate the reinforcement efficiency of lateral bucking of partially reinforced beam with web stiffener approximate analysis method is used to evaluate the reinforcement efficiency of web stiddener according to it's the location. To verify suggested approximate analysis method for lateral buckling of partially reinforced beam with web stiffener it's numerical results are compared with results by extended fininte element method for lateral buckling. The results of this study are as follow. 1.The effective location of web stiffener for reinforcement of lateral bucking is govered by the support condition of beams. It is the most effective that web stiffener located both ends for both ends simply supported beam, and in the case of both ends fixed beam, the web stiffener placed L/4 from both ends. 2.The error of the approximate analysis method that is compared with extended finite element method is increased according to the effectiveness of reinforcement. Both ends simply supported case, maximum error is 34% for analysis model No.(MD-2-B), and both ends fixed case maximum error is 16% for model No.(MD-2-D). 3.In approximate analysis method, it is considered that the increment of stiffness by web stiffener is overestimated. So, to reduce error in approximate analysis method, it is necessary that to apply reduction factor to the stiffness of web stiffener used in this study.