• 국제학술발표논문집
• /
• The 6th International Conference on Construction Engineering and Project Management
• /
• pp.730-731
• /
• 2015

This study aims at giving the framework to estimate the environmental load at planning and schematic phase. With increasing awareness of environmental issues, the effort to reduce the environmental impacts caused by human activity has been increasingly enlarged. So far most of researches estimating CO₂ emissions have analyzed energy consumption based on BOQ (Bills of Quantity) acquired after detailed design. There is also lack of reliability in the estimated environmental impact using the basic unit of a facility at the planning stage, because it uses a limited specific section of historical data. Thus, this study is targeted at developing framework to assess reliable environmental loads based on information available at project early phases by making case-bases from historical design information on PSC Beam Bridge. Historical database is built on the basis of the LCA (Life Cycle Assessment) and in order to set input information for estimating model, the literature about information in an early project phase are reviewed. Using the information available in the planning and schematic design stage, the Framework is presented to estimate the environmental load in an early stage in the project. Developing an environmental load estimation model in accordance with the Framework presented in this study, it is expected that the environmental load in the initial project phase can be estimated more quickly and accurately.

• 한국건설관리학회논문집
• /
• 제19권6호
• /
• pp.86-93
• /
• 2018

인간이 절대적으로 필요한 사회기반시설은 설치 및 유지관리 시 큰 환경부하를 발생한다. 특히, 유지관리는 장기간에 걸쳐 수행되며 보수방법 및 주기에 따라 환경부하가 달라지기 때문에 신뢰할 수 있는 추정 값을 제시하는데 한계가 있다. 이에 본 연구에서는 터널을 유지관리 할 때 발생하는 환경부하를 기획 또는 설계초기단계에서 신속하게 평가할 수 있도록 환경부하 추정모델을 개발하였다. 간략한 설계 자료만으로도 환경부하를 추정할 수 있는 모델개발을 위하여, 유지관리 단계에서의 환경부하 산정 방법론을 분석하고, 장기적인 유지관리의 특성을 고려한 보수주기와 보수율을 적용하였다. 최종적으로 모든 사용자들이 유지관리단계의 환경부하량을 편리하고 신속하게 추정할 수 있는 평가모델을 개발하는 것이 본 연구의 목표이며, 이를 통해서 도로 및 터널사업의 친환경적인 유지관리에 도움을 줄 수 있을 것으로 판단된다.

• Earthquakes and Structures
• /
• 제16권2호
• /
• pp.129-139
• /
• 2019

This paper develops a new method for estimating the elastic-plastic buckling strength of the truss structures under the static and seismic loads. Firstly, a new method for estimating the buckling strength of the truss structures was derived based on the buckling strength of the representative member considering the parameters, such as the structure configurations, boundary conditions, etc. Secondly, the new method was verified through the buckling strength estimation and the finite element method (FEM) analysis of the single member models, portal frame models and simple truss models. Finally, the method was applied to evaluate the buckling strength of a simple truss structure under seismic load, and the failure loads between the proposed method and the FEM were analyzed reasonably. The results show that the new method is feasible and reliable for structure engineers to estimate the buckling strengths of the truss structures under the static loads and seismic loads.

• 한국환경과학회지
• /
• 제16권2호
• /
• pp.203-210
• /
• 2007

The delivery load data obtained from Nakdong river basin are used for developing the model estimating the daily delivery load on the main side streams of Nakdong River. The developed model assesses the daily contamination loads of the main thirteen side streams that contribute to the main stream of Nakdong river. It is developed that the model using the simplified equation that can estimate the daily delivery loads on the side main streams of Nakdong river for a period of having no data of the water quality and flow. The developed model for estimating the daily delivery loads from the main side streams in Nakdong river basin on each item such as BOD, TN, and TP is expressed as Daily delivery load ($\frac{kg}{day}$) = Production load $(\frac{kg}{day}){\times}(1-{\alpha}){\times}(\frac{daily\;runoff}{average\;runoff\;per\;year}){\gamma}$. The estimated values obtained by using the model are almost fit to the calculated values (real data) that have been acquired from the thirteen main side streams in Nakdong river basin. The correlation coefficient values, R, that indicate the correlation between the estimated and the calculated show over 0.7 that mean the estimated values from the used model are adapted to the real data except TN values of Nam-river, Hwang-river, Gam-river, We-river. Especially, the correlation of TP values between the estimated and the calculated implies quite a creditable data to use.

• 한국지진공학회논문집
• /
• 제27권6호
• /
• pp.231-236
• /
• 2023

The importance of Structural Health Monitoring (SHM) in the industry is increasing due to various loads, such as earthquakes and wind, having a significant impact on the performance of structures and equipment. Estimating responses is crucial for the effective health management of these assets. However, using numerous sensors in facilities and equipment for response estimation causes economic challenges. Additionally, it could require a response from locations where sensors cannot be attached. Digital twin technology has garnered significant attention in the industry to address these challenges. This paper constructs a digital twin system utilizing the Long Short-Term Memory (LSTM) model to estimate responses in a pipe system under simultaneous seismic load and arbitrary loads. The performance of the data-driven digital twin system was verified through a comparative analysis of experimental data, demonstrating that the constructed digital twin system successfully estimated the responses.

• Wind and Structures
• /
• 제14권1호
• /
• pp.1-14
• /
• 2011

Open frame structures, such as those commonly found in industrial process facilities, are often densely occupied with process related equipment. This paper presents a method for estimating wind loads for high-solidity open frame structures that differs from current approaches, which accumulate wind load contributions from various individual structure components. The method considers the structure as a porous block of arbitrary plan dimension that is subject to wind from any direction. The proposed method compares favorably with wind tunnel test results for similar structures. The possibility of defining an upper bound force coefficient is also discussed.

• 한국물환경학회지
• /
• 제27권3호
• /
• pp.293-299
• /
• 2011

The quantity of a discharge load can change with changes in rainfall in the area with a combined sewer system (CSS). To evaluate the implementation appropriately in the management of total maximum daily loads (TMDLs), the effects of rainfall changes should be considered in the estimation of the discharge load. The rainfall condition for the estimation of the discharge load in a certain year should be standardized to the same rainfall condition as that of the reference year. However, the calculation process is very complicated with its potential limitations. This study investigated and developed relatively simple methods for estimating the discharge load. Load conversion method (LCM) is designed to convert the discharge load under the current rainfall condition into that of the reference rainfall conditions. Simple rainfall data method (SRDM) is to simplify the estimation process of the discharge load by the simple conversion of rainfall data. These methods were applied to calculate the discharge load and examine the estimation results. From the results of this study the application of these methods may be useful for estimating the discharge load in the TMDL process.

• 대한환경공학회지
• /
• 제32권2호
• /
• pp.175-184
• /
• 2010

본 연구에서는 유역모형인 BASINS/HSPF와 연계하여 비점유달부하량을 유황별(갈수기, 저수기, 평수기 등)로 산정하는 방법을 개발하고, 이를 전남지역에 위치한 동복천 유역에 적용하여 그 효용성을 평가하였다. 동복천 유역에 대한 BASINS/HSPF 모형의 보정 검증결과는 유출유량, BOD 및 T-P의 신뢰도지수가 각각 1.59, 1.41, 1.28로서 실측값과 예측값의 유사성은 높게 나타났다. 이와 같이 구축된 BASINS/HSPF 모형을 사용하여 동복천 유역의 갈수기, 저수기, 평수기에 대한 BOD와 T-P 비점유달부하량을 각각 구하면, 연간 일평균 비점배출부하량과 대비하여 0.36과 1.09, 0.82와 2.19, 6.02와 16.90이였다. 이러한 결과는 비점유달부하량을 유황별로 산정하여 서로 다르게 반영할 필요성이 있음을 보여주고 있으며, 이러한 경우에 본 연구에서 개발한 유황별 비점오염유달부하량 산정방법은 유용하게 사용될 수 있을 것이다.

• 대한토목학회논문집
• /
• 제37권4호
• /
• pp.705-716
• /
• 2017

산업화 시대를 지나며 많은 환경오염문제가 발생함에 따라, 친환경적이며 지속 가능한 발전을 위해 건설 산업계에도 환경성 평가 관련한 다양한 연구가 수행되고 있다. 그러나 설계단계 활용을 목적으로 토목시설물의 부위별 설계 대안에 대한 신속한 환경부하 산정 방법론은 부재하다. 이에 본 연구는 Pre-Stressed Concrete (PSC) beam교량을 대상으로 구조물 주요 부위별 표준단면을 이용한 환경부하 산정을 위한 선행연구로서, 설계초기 단계에서의 대표물량정보 기반 환경부하량을 효율적으로 산정할 수 있는 설계부위 및 공종정보 기준을 구축하는 것을 목표로 하였다. 이를 위해 25개 PSC Beam교량 사례에 대한 상세설계자료를 기반으로 ISO 14040의 전과정평가(Life Cycle Assessment, LCA) 수행절차를 통한 상세환경부하량 데이터베이스를 구축하였으며, 목적 및 범위는 교량의 자원제조 및 수송단계와 시공단계만으로 한정하였다. 또한, 환경부하발생에 영향이 높은 부위별 대표공종을 선정하여, 이러한 부위 및 공종분류에 따른 소요자원 및 8대 영향범주 별 환경부하량 특성분석을 수행하였다. 그 결과 교량의 특성상 상부공이 전체 42.91%의 환경부하량으로, 상부공중에서는 주요 자재인 레미콘이 53.13%, PSC beam공이 31.25%로 나타났다. 또한, 하부 교대 교각공에서는 주요 자재인 레미콘, 철근, 시멘트가 93%이상으로 대부분을 차지하였다. 향후 이러한 교량 부위별 대표공종 및 자재 정보들은 설계단계에서 구조물의 특성이 반영된 개략 환경부하량 모델 구축시 활용될 수 있을 것이다.

• 한국물환경학회지
• /
• 제33권2호
• /
• pp.123-129
• /
• 2017

The purpose of this study is to identify potential methodologies to reasonably estimate the effectiveness of road vacuum cleaning in terms of pollution loads reduction. In this context, this study proposes two empirical equations to estimate the amount of diffuse pollution loads removed by road vacuum cleaning. The proposed equations estimate the removed amount of pollution loads respectively taking into consideration of: a) the distance of road vacuum cleaning; and b) the amount of road-deposited sediment(RDS). All of the parameters in these equations were evaluated based on results of field monitoring and laboratory analyses, except for the RDS generation rate. The results of this study suggest that pollutant removal efficiency is 46.3% for $BOD_5$ and 56.4% for TP; discharge ratios for particulate and dissolved $BOD_5$ are 35.0% and 21.2%, respectively; discharge ratios for particulate and dissolved TP are 35.0% and 19.4%, respectively. Average concentrations of pollutants in RDS are $BOD_5$ 977.3 mg/kg and TP 317.6 mg/kg. Some results of a case study imply that both equations can be potentially useful if the adopted parameters are reasonably evaluated. In particular, the RDS generation rate should be evaluated based on monitoring data collected from various road conditions.