콘크리트 構造物의 非線形解析에 관한 硏究

郭潤根 金烏工科大學校 1986 論文集 Vol.7 No.-

The Objective of this paper undertakes to (1) develop and verify the criteria for yielding and failure of Concrete under uniaxial loading and biaxial loading, (2)show the applicability of the approach by comparing with existing experimental results. An analytical constitutive relation of concrete under general three-dimensional stress states is proposed herein. in the formulation, the concrete is assumed to be a linearly elastic-plastic strain hardening-fracture material.

構造物의 疲榮解析을 위한 바람의 모델화

곽윤근,하영철 金烏工科大學校 1992 論文集 Vol.13 No.-

This paper describes the wind modelling for analysing fatigue damages of structure. In modelling the observed strong wind information, three steps of wind action in the long period are selected to discuss the fatigue damage properties. The first wind model is to present the simple strong wind continuing normally during 20 to 30 hours from annual average about 4-5 m/s to the extreme maximum wind velocity. Next step is to represent the whole annual wind actions using the meteorologically observed wind velocity per hour. Finally, the return period concept is utilized to the overall fatigue damage of a life time of the structure. Approximate wind modelling proposed in this papers is useful for analysing fatigue damage of structure under strong wind.

수직하중을 받는 벽보의 構造擧動에 관한 硏究

郭潤根 國立金烏工科大學校附設生産技術硏究所 1987 産業技術開發硏究 Vol.3 No.-

This paper reports the results of test of 8 simply supported wall beams with varying span to depth ratio and varying combinations of vertical, horizontal and inclined web reinforcement. The effects of four types of web reinforcement on the strength, behavior, diagonal cracking, and midspan deflections of normal weight concrete wall beams reinforced with plain round bars have been investigated.

유한요소법에 의한 철근콘크리트 구조물의 비선형 해석

이문재,곽윤근 金烏工科大學校 1996 論文集 Vol.17 No.-

In the study theoretical formulas are suggested for nonlinear finite element analysis of the reinforced concrete structural walls. The concrete nonlinearities are reflected in the constitutive relation of plane stress by strength magnification factor following stress ratio and by reduction factor which is accounted for nonlinear material properties of concrete. Rectangular elements with eight-nodes are used for concrete structures and truss elements are adopted for reinforcing bars in finite element formulation. The proposed analytical model is capable of predicting the stress-strain relationship of structural walls within reasonable accuracy. The predictions of the model are compared with experimental results reported in the literature and the comparisons are judged to be good.

도시근린공원의 이미지와 이용만족도에 관한 연구

하영철,정수일,곽윤근,신현익,하헌정,김익환,김석만 金烏工科大學校 1999 論文集 Vol.20 No.-

This paper presents the future direction of the development and maintenance of the urban park of the Kumi city. The direction was obtained by analyzing the evaluation results on the satisfaction level of park use and the park image of the park users. The analysis results are as follows. 1) It turns out that the rest and accommodation facilities are the major facilities that uplifts the total image of the park. 2) Among the park images, the image on the pleasantness was the major image, related with the satisfaction on the park equipments. 3) The social class, who gave a bad score on the above equipments and images, is a low-aged class, who is a white class with high income as well. Therefore, it is suggested that the park maintenance plan, with emphasis on the class, is an important task.

强風의 發生成因別 時間的 變化에 관한 硏究

황진득,하영철,곽윤근 金烏工科大學校 1994 論文集 Vol.15 No.-

The wind resistant design of building generally used up to data has been based on the value of an extreme speed. The extreme speed is normally estimated from wind data observed for the return periods of last 50 years or 100 years on the basis of the importance of building to be constructed. However, it is essential to consider the time variance of wind action because strong winds originated by Typhoon or others are occationally coming for attack. This study is to examine the origin of occurence and the action time of strong wind, and to understand the time variance characteristics. Strong winds are divided into 3 parts such as the regional condition of Korea, namely Typhoon, Frontal system storm, and Monsoon. The areas reflecting the origin of 3 kinds of the strong winds are also devided are selected as such as Seoul-Kyongki, Jungbu, and South-seashore. The representative cities are selected as Seoul fro, Uljin and Kunsan for, and Busan and Yeosu for. Observed wind data of past 20 years will be employed to estimate duration and propability of wind velocity. The observed wind data are recorded with duration of 96 hours at the center that annual extreme wind speed takes place, and with the mean value of wind velocity during 10 minutes at 1 hour interval. Based on these investigations, the duration and probability of wind velocity should be estimated. Generalized probability distribution function of wind velocity will be proposed. Duration of strong winds presented as a function of its maximum wind velocity. From these results, multipling generalized distribution function by generalized number of (wind velocity) samples, approximate equation of wind-duration will be derived. Approximate equation of wind-duration proposed in this study should be useful for analysing fatigue damage of structures and time dependent analysis of structure under strong wind in Korea.

鐵筋 콘크리트 有孔보의 擧動에 관한 실험적 연구

이화직,최종만,하영철,곽윤근 金烏工科大學校 1993 論文集 Vol.14 No.-

Openings through beams are required for the passage of utility ducts and pipes, and they are frequently encountered in the design of modern buildings. They are particularly important in multistory buildings where the use of openings in beams can mean lower story heights, leading in turn to a multiplicity of savings. Therefore, the designers are often faced with the necessity of providing adequate openings in the buildings. However, provision of openings may cause problems of excessive cracking and deflection, and may severely affect the strength of a beam. An experimental investigation is carried out on ten reinforced concrete beams with rectangular openings. The size of opening and it's location are considered as major variables. The specimens were tested under two point loading. Loads were usually applied in steps of 0.5 ton up to failure to observe the crack initiation and propagation, initial diagonal cracking midspan deflection, concrete strain and reinforcement strain.

鐵筋 콘크리트 有孔보의 거동에 관한 실험적 연구(Ⅱ)

최종만,이화직,하영철,곽윤근 國立金烏工科大學校附設生産技術硏究所 1994 産業技術開發硏究 Vol.10 No.-

Openings through beams are required for the passage of utility ducts and pipes, and they are freqently encountered in the design of modern buildings. They are particularly important in multistory buildings where the use of openings in beams can mean lower story heights, leading in turn to a multiplicity of savings. Therefore, the designers are often faced with the necessity of providing adequate openings in the buildings. However, provision of openings may cause problems of excessive cracking and deflection, and may severly affect the strength of a beam. An experimental investigation is carried out on twelve reinforced concrete beams with square openings. The size of opening, and it's location are considered as major variables. The specimens were tested under two point loading. Loads were usually applied in steps of 0.5 ton up to failure to observe the crack initiation and propagation, initial diagonal cracking, midspan deflection, concrete strain and reinforcement strain.

Fire Behavior of Steel Columns Encased by Damaged Spray-applied Fire Resistive Material

Kwak, Yoon Keun,Pessiki, Stephen,Kwon, Kihyon Architectural Institute of Korea 2008 Architectural research Vol.10 No.1

A Steel column with damaged spray-applied fire resistive material (SFRM) may exhibit reduced structural performance due to the effects of elevated temperature during fire events. Thus, the fire load behavior of steel columns with removed or reduced SFRM needs to be examined to predict the structural damage by fire. FEM analyses were performed for the flange thinning removal models in which the SFRM was reduced as a constant strip in thickness at the top flange of the column. The temperature results for all models obtained from the heat transfer analyses were included as an initial condition in the FEM structural analyses. In this study, the results of analysis show that even small remnants of SFRM led to an effective reduction of temperature at any given fire duration, and improved significantly the axial load capacity of a column as compared to the complete removal cases of SFRM.

Fire Behavior of Steel Columns Encased by Damaged Spray-applied Fire Resistive Material

Yoon Keun Kwak,Stephen Pessiki,Kihyon Kwon 대한건축학회 2008 Architectural research Vol.10 No.1

A Steel column with damaged spray-applied fire resistive material (SFRM) may exhibit reduced structural performance due to the effects of elevated temperature during fire events. Thus, the fire load behavior of steel columns with removed or reduced SFRM needs to be examined to predict the structural damage by fire. FEM analyses were performed for the flange thinning removal models in which the SFRM was reduced as a constant strip in thickness at the top flange of the column. The temperature results for all models obtained from the heat transfer analyses were included as an initial condition in the FEM structural analyses. In this study, the results of analysis show that even small remnants of SFRM led to an effective reduction of temperature at any given fire duration, and improved significantly the axial load capacity of a column as compared to the complete removal cases of SFRM.