리모델링 사업에서의 공사항목 선정에 관한 연구 : 군인아파트 리모델링 공사를 중심으로

전재열,이재석,류국무,신병현 단국대 부설 리모델링연구소 2005 리모델링 연구소 논문집 Vol.3 No.2

Since the beginning of our military history, we are continuously interested in supplying apartment for military officers. So we possessed 72,361 households and used in 2002. however, 18% of those are over 20years and need to be remodeled. Department of Military has taken this fact seriously to solve the problems, they built more new buildings, rent public buildings and remodeled the old one. But, The procedure of present military apartment remodeling has many problems at the stage of evaluating the priorities in various remodeling projects which have been caused from lots of corps. I’ve reviewed the study of military apartment business and applied the AHP(Analytic Hierarchy Process) method which is effective to evaluate the priorities in various groups’ decision.

내진설계되지 않은 벽식 아파트의 탄소섬유와 L형강을 이용한 벽-슬래브 접합부 보강

박태원,노공기,박현수,정란 단국대 부설 리모델링연구소 2005 리모델링 연구소 논문집 Vol.3 No.1

The reinforced concrete wall type apartments built before 1988 in Korea, which are rarely seen in other countries, were constructed using tunnel form method for convenience of construction. Tunnel form method, however, do not arrange bearing walls in the direction of long side of the apartment, and this results in little resistance capability against lateral loads in that direction. Consequently, there exists significant collapse possibility due to the formation of plastic hinge at the joints of wall and slab during earthquake. This study experimentally investigates the reinforcement methods using carbon sheet and L-shaped steel which were not seismically designed. The reinforcement method using carbon sheet and L-shaped angle, has following advantages; construction workability, usage of light-weight material, and little requirement for the installation room. The specimen with steel bar fill up using modified epoxy mortar in the mid-span of the slab shows the same stiffness as the standard specimen without reinforcement and the stiffness of the specimen reinforced by carbon sheets without L-shaped steel was increased by only about 13%, implying that those existing methods cannot provide significant reinforcement effects. For the specimens of which wall-slab joints were reinforced using both carbon sheet and L-shaped steel, the increase of stiffness ranges from 43% to 496% and the increase of energy dissipation amount ranges from 120% to 233%. Also it was identified that the linkage method using penetration bolts was more efficient than the one using expansion anchors in increasing stiffness, strength and energy dissipation capacity.

실시간 지진감시용 구조물의 위험수준 판단지표

이성경,문병욱,허재성,민경원 단국대 부설 리모델링연구소 2007 리모델링 연구소 논문집 Vol.5 No.1

It is considered that taking off such thought that our country is safe from earthquakes, the development of technologies to prevent secondary calamities due to seismic loads such as a fire and gas explosion is urgently required. The objective of this study is to establish the level of indices for determining the danger level of structures, which can be applied to a real-time seismic monitoring to minimize auxiliary damages of structures due to earthquakes. First, the cumulative absolute velocity (CAV) closely related to the concept of averaged velocity of a certain earthquake wave and the spectral intensity (SI) values based on the velocity response spectrum are addressed to specify a certain level of indices for a real-time seismic monitoring. Then, the CAV and SI values are calculated with the artificial seismic waves that are produced based on the design response spectrum of a structure specified in the seismic criteria of KBC 2005. Finally, the early warning, shut-down of facilities and escape stages are proposed by determining the level of indices which are compared with the results of existing studies.

등가 단자유도계를 이용한 다층 철골조 건물의 에너지 요구량 산정

김진구,최현훈 단국대 부설 리모델링연구소 2003 리모델링 연구소 논문집 Vol.1 No.1

In equivalent static nonlinear analysis and in energy-based design, the structures are generally transforrned into an equivalent SDOF system. In this study the seismic energy demands in multi story structures, such as three-, eight-, and twenty-story steel moment-resisting frames (MRF), buckling restrained braced frames (BRBF) and a damage tolerant buckIing restrained braced frame (DTBRBF), are compared with those of equivalent single degree of freedom (ESDOF) systems. Sixty earthquake ground motions recorded in different soil conditions, which are soft rock, soft soil, and near fault, were used to compute the input and hysteretic energy demands in model structures. In case the modal mass coefficient is less than 0.8, the effects of higher modes are considered in the process of converting into ESDOF. According to the analysis results, the hysteretic and input energies obtained from three story and eight story MRF and DTBF agreed well with the results from analysis of equivalent SDOF systems. However in the twenty' story BRBF the results from ESDOF underestimated those obtained from the original structures

ANP기법을 이용한 건축공사 리스크 중점관리 요소 도출 모델

권원,전재열 단국대 부설 리모델링연구소 2011 리모델링 연구소 논문집 Vol.9 No.2

With the trends of massiveness and complexity of construction, the main agents of construction have considered the various types of risk management strategies to minimize the loss caused by the risk factors from the nature of construction project, regional characteristics, and scale of construction. The risk management has been conducted, because the risk factors have exacerbated the condition of construction in terms of the level of productivity, quality of construction, atmosphere, and budget. Based on thε interests regarding risk factor management, the current study suggests the work breakdown structure-based process. Additionally, based on the work breakdown structure, the risk factors on constructions are identified and stratified depending on the level of salience of each risk factor. The purpose of result is to lead Korean Land Corporation understand and control the risk factors properly for the advanced construction process of Korean Land Corporation. Ultimately the current study contribute to advance of efficient risk management strategies by using ANP method, which identify and control the primary risk factos depending on the impact of the interaction and subordinate relationship between risk factors.

동조액체기둥감쇠기의 동적 특성

이성경,정희산,민경원 단국대 부설 리모델링연구소 2009 리모델링 연구소 논문집 Vol.7 No.2

The purpose of this study is to verify the transfer function of input acceleration and output control force based on linearizing a damping term of Tuned Liquid Column Damper(TLCD) with nonlinearity analytically. In addition, analysis is conducted for dynamic characteristics according to the design parameter such as section ratio of both vertical and horizontal column and the level of liquid in the vertical column which is used for tuning method. The dynamic characteristics is identified by the analysis for the natural frequency, damping ratio and effective mass ratio of TLCD and a shaking table test for the transfer function. The results indicates that the level of liquid and section ratio affect the characteristics of damping ratio and mass ratio. Damping and mass ratio increase as the section of vertical column of TLCD decreases due to turbulence in the elbow of TLCD.

고강도 매스 콘크리트의 압축강도 관리에 관한 연구 : 단열양생법을 중심으로

공민호,정상진 단국대 부설 리모델링연구소 2006 리모델링 연구소 논문집 Vol.4 No.1

Because of building higher story and larger buildings, and because current concrete, a basic construction material, needs higher strength rather than normal strength, the use of high-strength concrete becomes more widely spread. High-strength concrete shows very high temperature increase due to inside heat of hydration different from normal-strength concrete, and because mass concrete under low temperature shows temperature stress due to temperature difference between inner and outer parts, it is known or reported that there is a significant difference between the compressive strength of srtucture and that of specimen for management, and between the compressivestrength of circular specimen made by standard underwater curing and structure concrete Therefore, in this research, an adiabatic curing box was manufactured which can provide hydration heat hysteresis of high strength mass concrete members and similar hydration heat hysteresis, using insulating materials, as a easy and exact method to manage compressive strength of rnass concrete member under low temperature, and the features of concrete member and those of specimen for management were compared.

비선형 구조물에 설치된 마찰감쇠기의 성능평가

이성경,박지훈,문병옥,민경원 단국대 부설 리모델링연구소 2007 리모델링 연구소 논문집 Vol.5 No.2

This paper deals with the numerical model of a bracing-friction damper system and its deployment using the optimal slip load distribution for the seismic retrofitting of a damaged building. The Slotted Bolted Connection (SBC) type friction damper system was tested to investigate its energy dissipation characteristic. Test results coincided with the numerical ones using the conventional model of a bracing-friction damper system. The placement of this device was numerically explored to apply it to the assumed damaged-building and to evaluate its efficiency. It was found by distributing the slip load that minimizes the given performance indicies based on structural response. Numerical results for the damaged building retrofitted with this slip load distribution showed that the seismic design of the bracing-friction damper system under consideration is effective for the structural response reduction.

기존 가새골조의 내진보강 방안에 관한 연구

김진구,김지웅 단국대 부설 리모델링연구소 2004 리모델링 연구소 논문집 Vol.2 No.1

The chevron braced frames designed without considering the unbalanced force induced in floor beams tend to become unstable when they are subjected to a seismic load. To enhance the seismic performance of OCBF chevron braced frames the effect the following three retrofit schemes are investigated: buckling-restrained braces, zipper columns, V-shaped cables. According to analysis results of unretrofitted model structures, collapse mechanism occurred in a certain story when they were subjected to design level seismic load. However in the retrofitted structures the plastic hinges were distributed in many stories, and the amount of plastic deforrnation was also decreased.

초기 고온이력을 받은 시멘트 모르터의 압축강도 특생에 관한 실험적 연구

공민호,정상진 단국대 부설 리모델링연구소 2006 리모델링 연구소 논문집 Vol.4 No.2

This study is basic experiment for estimating influence of strength by curing temperature of concrete's heat of hydration and estimate relationship of compressivε strength development by initial curing temperature factor, and then asume temperature factor which influence compressive strength development and for showing basic document of quality control. According to the result of cement mortar by the curing temperature factor high-curing temperature shows high strength on 3 day compare with low curing-temperature, shows higher strength than the piece of high curing temperature.