• 교육시설 논문지
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• 제19권4호
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• pp.21-28
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• 2012

This study proposes a procedure for evaluating the seismic performance and retrofit of a typical reinforced building (R/C) school buildings contructed in the 1980s. The procedure is derived from the Japanese Standard for Evaluation of Seismic Capacity of Existing Reinforced Concrete Buildings and Nonlinear Static Procedure (NSP) specified in Federal Emergency Management Agency (FEMA 356). In this study, the Japanese Standard was applied for evaluating the additionally required seismic performance in the existing school building. Cast-in-place (CIP) reinforced concrete infill walls and steel braces were used to seismically retrofit the existing school building located in the region of Hongsung in Chungnam. In the pushover analysis, i.e NSP, the hinge properties of columns, beams, infill walls and steel braces were carefully calibrated based on the existing experiment results in the available literatures. The predicted seismic performance for the retrofitted building was compared to that for the virgin building. Based on the seismic evaluation with the Japanese Standard and the FEMA 356 criteria, the addition of CIP reinforced concrete infill walls and steel braces have superior constructablility and can improve effectively the seismic performance of the existing school buildings constructed in 1980s.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 1999년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Fall
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• pp.305-312
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• 1999

A four-story reinforced concrete frame building model is designed for the gravity loads. only Static nonlinear pushover analyses are performed in two orthogonal horizontal directions. The overall capacity curves are converted into ADRS spectra and compared with demand spectra. At several points the deformed shape moment and shear distribution are calculated. It is observed that the seismic capacity may not meet the design requirements in soft soil condition and may collapse in MCE. It is concluded that limited but adequate amount of ductility need be provided in the seismic design in low to moderate seismicity regions.

• Structural Engineering and Mechanics
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• 제53권4호
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• pp.791-818
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• 2015

RC buildings constitute the prevailing type of construction in earthquake-prone region like Kathmandu Valley. Most of these building constructions were based on conventional methods. In this context, the present paper studied the seismic behaviour of existing RC buildings in Kathmandu Valley. For this, four representative building structures with different design and construction, namely a building: (a) representing the non-engineered construction (RC1 and RC2) and (b) engineered construction (RC3 and RC4) has been selected for analysis. The dynamic properties of the case study building models are analyzed and the corresponding interaction with seismic action is studied by means of non-linear analyses. The structural response measures such as capacity curve, inter-storey drift and the effect of geometric non-linearities are evaluated for the two orthogonal directions. The effect of plan and vertical irregularity on the performance of the structures was studied by comparing the results of two engineered buildings. This was achieved through non-linear dynamic analysis with a synthetic earthquake subjected to X, Y and $45^{\circ}$ loading directions. The nature of the capacity curve represents the strong impact of the P-delta effect, leading to a reduction of the global lateral stiffness and reducing the strength of the structure. The non-engineered structures experience inter-storey drift demands higher than the engineered building models. Moreover, these buildings have very low lateral resistant, lesser the stiffness and limited ductility. Finally, a seismic safety assessment is performed based on the proposed drift limits. Result indicates that most of the existing buildings in Nepal exhibit inadequate seismic performance.

• 디지털융복합연구
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• 제20권4호
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• pp.261-268
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• 2022

본 연구는 농어촌지역개발 지역역량강화사업에서 주민 참여의도가 사업성과에 미치는 영향을 규명하고자 하였다. 연구 방법은 전남지역내 농어촌지역개발사업을 추진하거나 완료한 마을의 주민들을 대상으로 직접 방문식 설문을 통해 238개의 표본을 수집하였고, SPSS22.0와 PROCESS macro 3.5 Model 4를 통해 가설을 검증하였다. 연구 결과는 첫째, 사업 참여의도 인식수준에 따라 사업성과에 차이를 보였다. 둘째, 사업 참여의도는 사업성과에 정(+)의 영향을 나타냈다. 셋째, 지역역량강화사업은 사업 참여의도와 사업성과간에 매개효과가 있는 것으로 확인되었다. 연구의 한계는 연구표본이 전남지역에 한정됐다는 점, 사업성과에 정량적 측정이 병행되지 않은 점 등이 있으며, 이를 토대로 향후 주민참여의도가 실제 주민참여로 이어졌는지와 그에 따른 성과검증을 통한 구체적 연구가 마련되어야 할 것이다.

• 디지털콘텐츠학회 논문지
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• 제17권6호
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• pp.471-477
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• 2016

인프라가 열악한 개도국에서의 ICT역량 강화교육은 ICT 격차해소 및 경제력 향상에 도움을 주는 해결책이라고 할 수 있다. 하지만 국가의 지리적, 산업적인 면에서 다양한 정보화 수준차이가 분명히 존재하므로, 일률적이며 일방적인 ICT 역량강화교육보다는 각 국가의 다양한 산업수요현황에 따라 국가별 맞춤형 교육 콘텐츠 설계를 할 필요가 있으며 이를 위한 기초적인 현황 파악이 선행되어야 한다. 본 연구는 개발도상국 중 캄보디아 라이프대학교 여대생들을 대상으로 현지 ICT 기술수준 및 교육현황을 파악하고 지역별 산업과 연계된 과목을 발굴하며 지속적인 운영을 위한 정책등을 제언하는 것을 목표로 한다.

• Structural Engineering and Mechanics
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• 제88권1호
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• pp.13-23
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• 2023

Seismic risk assessment studies are one of the most crucial instruments for mitigating casualties and economic losses. This work utilizes fragility curves to evaluate the seismic risk of single-story precast buildings, which are generally favored in Marmara's organized industrial zones. First, the precast building stock in the region has been categorized into nine sub-classes. Then, seven locations in the Marmara region with a high concentration of industrial activities are considered. Probabilistic seismic hazard assessments were conducted for both the soil-dependent and soil-independent scenarios. Subsequently, damage analysis was performed based on the structural capacity and mean fragility curves. Considering four different consequence models, 630 sub-class-specific loss curves for buildings were obtained. In the current study, it has been determined that the consequence model has a significant impact on the loss curves, hence, average loss curves were computed for each case investigated. In light of the acquired results, it was found that the loss ratio values obtained at different locations within the same region show significant variation. In addition, it was observed that the structural damage states change from serviceable to repairable or repairable to unrepairable. Within the scope of the study, 126 average loss functions were presented that could be easily used by non-experts in earthquake engineering, regardless of structural analysis. These functions, which offer loss ratios for varying hazard levels, are valuable outputs that allow preliminary risk assessment in the region and yield sensible outcomes for insurance activities.

• 한국BIM학회 논문집
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• 제9권3호
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• pp.19-29
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• 2019

Currently, BIPV (Building Integrated Photovoltaic) design technology lacks analysis function at the planning stage, and there is a lack of understanding and reliability of BIPV design method and system for building designers. To design and consider various building integrated solar design alternatives, the color of building integrated solar is often monotonous or does not match the design direction of the building. In this study, architectural designers can select various color modules in the planning and design process of the building and analyze the characteristics of color module solar cells and compare and analyze the actual solar radiation and predicted solar radiation in Republic ofKorea Seoul to reduce the confusion of design methods. By building a BIM design integrated system that can prove the quality of the building and analyze the shading analysis and power generation performance architecturally, it can improve the reliability of color module solar cell applicability that can express aesthetics in buildings and the predicted solar power generation capacity of each region. In the initial design stage, based on the empirical data of the BIPV system, it is possible to analyze the power generation performance for each installation angle and installation direction by analyzing the surrounding environment and the installation area, and accurately determine the appropriateness of the design accordingly.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 춘계 학술논문 발표대회
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• pp.43-44
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• 2016

Large amount of dredged sea soil is produced in southeast seashore region in during harbor maintenance. Disposal of dredged sea soil has become difficult due to the environmental regulation. Therefore, disposal of dredged sea soil method is to landfill. But, the capacity of the landfill limit state and if the size of the dredged sea soil is in the range of silt or clay, it cannot be used as reclamation material because ground subsidence occur. In this study, analyzed the pozzolanic activity of dredged sea soil. Analysis of the results showed a pozzolanic activity of dredged sea soil. In addition, incorporation of heat treated dredged sea soil increase both 28 and 56 day compressive strength of mortar specimen.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
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• pp.179-184
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• 2001

The objective of this study is to clarify the seismic capacity and the characteristics in the hysteretic behavior of RC structures with nonseismic detailing. To do this, an exterior beam-column subassemblage was selected from a 10-story RC building and 6 1/3-scale specimens were manufactured with 3 variables; ⑴ with and without slab, ⑵ upward and downward direction of anchorage for the bottom bar in beams, and ⑶ with and without hoop bars in the joint region. The test results have shown that ⑴ the existence of slab increased the strength in positive and negative moment, 25% and 62%, respectively; ⑵ the Korean practice of anchorage (downward and 25 $d_{b}$ anchorage length) caused the 8% reduction of strength and the early strength degradation when compared with the case of seismic details; and ⑶ the existence of hoop bars in the joint region does not show significant difference because the size of column is much larger than that of beam.m.

• 대한토목학회논문집
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• 제29권6A호
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• pp.577-585
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• 2009

이 논문은 원전 격납건물의 극한내압능력 평가와 비선형해석을 수행하기 위하여 개발된 해석프로그램인 9절점 퇴화 쉘 유한요소에 대하여 기술하였다. 개발된 쉘 유한요소는 퇴화 고체기법과 구조물에서 발생하는 횡전단변형도를 고려하기 위하여 Reissner-Mindlin(RM)가정을 도입하였다. 콘크리트의 재료모델은 등가응력-등가변형률의 관계를 이용하여 콘크리트의 응력과 변형률의 수준을 결정하고, 콘크리트에 균열이 발생하면 부착응력을 고려하는 인장강성모델과 균열면에서의 전단전달 메카니즘 그리고 균열면에서 압축강도 감소모델 등으로 재료적 거동을 나타내었다. 또한 균열발생기준으로 압축-인장영역에는 Niwa가 제안한 응력포락선을 도입하였고, 인장-인장영역에는 Aoyagi-Yamada가 제안한 응력포락선을 사용하였다. 개발된 프로그램의 성능은 다양한 수치예제를 통하여 검증하였다. 검증예제 결과로부터 개발된 쉘 유한요소를 이용한 해석결과는 실험결과 또는 다른 해석결과와 유사한 결과를 도출하였다.