• Proceedings of the Computational Structural Engineering Institute Conference
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• 2011.04a
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• pp.743-746
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• 2011

본 연구에서는 유한요소해석을 이용하여 차량속도 및 긴장재의 설계에 따른 CFTA 거더의 동적거동 및 동적증폭계수를 분석하였다. 긴장재의 해석변수로서는 긴장재의 양과 긴장력을 고려하였으며 차량하중은 도로교설계기준의 DB-24 하중을 선택하였다. 차량하중은 3축-2트랙에 작용하는 등가절점하중으로 변환하여 속도에 따라 시간함수로 모델링하였다. 긴장재의 양은 외측 �� 내측 덕트의 유무에 따라 변화시켰으며 긴장력은 설계긴장력의 0%에서 100%까지 25%씩 증가시켰다. 차량속도는 40km/hr에서 100km/hr까지 20km/hr씩 증가시켰으며, 해석결과 긴장재의 긴장력 변화는 거더의 동적거동에 영향을 주지 않았으며 초기처짐에만 영향을 주었다. 긴장재의 양에 따라서는 거더의 동적거동이 다르게 나타났으며 긴장재의 양이 적을 수록 동적처짐은 증가하였다. 이를 바탕으로 거더의 동적증폭계수(DAF)를 산출하였으며, 이 결과 긴장재가 없는 경우에도 도로교표준시방서에서 정한 기준 값보다 매우 작은 거동을 보였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.10
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• pp.88-96
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• 2017

The construction standards in Korea consist of design standards and specifications. They are provided by the national transportation electronic information center in file format, not in a DB, which may lead to their incomplete utilization and versatility, such as a lack of history management and reference functions. This also makes it difficult to cross-refer to standards and manage revision history. In this study, we developed a code management system for the national construction standards by analyzing domestic and overseas related systems, in order to pinpoint the problems in the current system and its development direction and, thus, to suggest a detailed plan for the design and implementation of a code management system. The developed system comprises four subsystems, namely a construction standards making system, construction standards service system, construction standards maintenance system and construction standards portal system. The results of this study are expected to improve the user's convenience by facilitating the revision, operation and history management of the complex and various construction standards, and to provide high-quality national construction standards by effectively supporting the revision and operation of the national construction standards with minimum duplication and conflicts.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.11a
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• pp.125-128
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• 2005

건설산업의 특성 상 도로, 교량 등 하나의 시설물을 준공하여 유지관리하기까지 설계 기준서, 시방서, 규격서, 보고서 등 각종 건설 제기준과 기술문서를 지속적으로 참조하여야 한다. 이러한 문서를 언제, 어디서, 누구나 쉽고 편리하게 공유 및 재활용할 수 있도록 전자매뉴얼체계를 건설분야에 도입하고자 본 연구를 수행하였다. 전자매뉴얼 구축에 필요한 요소기술과 기능기술을 분석하였다. 분석된 요소 및 기능기술에 부합하도록 XML 스키마 기반으로 한 35종의 전자매뉴얼 정보체계를 개발하였다.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2016.11a
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• pp.167-170
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• 2016

본 논문에서는 실패한 구조물에 초점을 맞추어 조사를 진행하였다. 실패한 구조물은 구조적, 역학적, 환경적 부정합으로 인해 구조물이 붕괴된 경우로 인명 피해가 발생한 것으로 정의하였다. 삼풍백화점과 성수대교의 국내 사례와 방글라데시 라나 플라자, 미국 미시시피 강 교량의 국외 사례를 통하여, 각각의 붕괴사고의 원인을 규명하였으며, 붕괴사고의 해결책을 모색하고 체계적으로 분석하였다. 본 연구를 통하여 구조물의 붕괴 뿐 만이 아니라, 다방면의 재난을 예방 및 방지할 수 있는 연계 시스템의 확립 또한 강조하였으며, 사고방지를 위해 변화하는 시방서 및 기준에 대하여도 언급하였다.

• Journal of the Korean Geotechnical Society
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• v.17 no.4
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• pp.145-151
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• 2001

본 연구에서는 울산 삼산지역의 도시 개발로 인하여 다량 발생되고 있는 건설잔토의 유효이용을 목적으로 대상토에 생석회와 화학 첨가제를 혼합하여 안정처리를 할 경우 보조기층 및 노상용 재료로써의 사용 가능성을 평가하였다. 1가 이온($Na^{+}$, $K^{+}$)가 2가 이온(Ca$^{2+}$, $Mg^{2+}$), 염화물(Cl)과 황산염(So$_4$)으로 구성된 화학 첨가제의 첨가에 따른 일축압축강도를 비교한 결과, 1가 이온의 첨가시 장기강도 발현이 우수한 것으로 나타났고, 염화물(Cl)은 첨가시 강도 발현이 우수한 것으로 나타났다. 건설잔토에 생석회와 CaCl$_2$를 첨가하면, 생석회로 처리된 시료에 비해 2배~4배의 강도가 증가되어 생석회 안정화에 대한 효과가 좋은 것으로 나타났다. 원시료토에 생석회, 생석회와 화학 첨가제로 안정처리하여 도로의 보조기층재료나 노상용 재료로의 사용여부를 평가한 결과, 생석회와 CaCl$_2$로 안정처리한 경우만이 시방기준 CBR 10%이상, 소성지수 10%이하를 만족시켜 노상용 재료로서의 사용가능성을 확인할 수 있었다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2008.05a
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• pp.374-378
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• 2008

The analysis about cases which does not correspond in electric equipment technical standard and judgement standard while doing pre inspection, it improves the technical specifications and the draft of construction plan. The analysis of the reform cases prevents the electric disaster and propagates the electrical safety. Hereafter the reform cases will improve the electric technical ability and help the electrical safety of the yard.

• Journal of the Korean Institute of Landscape Architecture
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• v.41 no.4
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• pp.77-84
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• 2013

With the increase in occurrence frequency and severity of natural disasters due to climate changes arising from global warming, damage in the landscaping field is rising. This leads to legal disputes, and is increasing social and economic damage, too. Especially even though landscape trees which are highly affected by external environments, suffer lots of damage from natural disasters, there is no specific scope of disaster criteria and thus it brings plenty of problems of damage restoration and compensation. Therefore, this study aims to suggest that gives ways to improve related criteria for damage of landscape trees from natural disasters. For this objective, this study analyzed damage cases of landscape trees and precedents, and compared Korean and Japanese legal systems and criteria regarding natural disasters with each other. The analysis result showed that opinions of experts have a great deal of influence on judgment results, since there is no definite legal basis on damage from natural disasters in the landscaping field. This implies the need for a professional and objective appraisal process. According to the comparative analysis of Korean and Japanese legal systems and criteria regarding natural disasters, Korea lacked in laws and criteria on natural disasters of landscape plants in Korea, whereas there were concrete disaster assessment standards of landscape trees in Japan. For improving natural disaster-related systems and criteria in the landscaping field, therefore, this study presented 'Revision of related laws', 'Revision of appraisal and loss assessment criteria', 'Revision of standard specification of landscaping project', 'Compulsory insuring against disasters', 'Reasonable fulfillment of contract', and 'Compulsory cost estimation for disaster restoration', as improvement plans.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2008.11a
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• pp.344-348
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• 2008

During the last few years, the use of Pre-tensioned spun High strength Concrete(PHC) pile has been gradually increased in many construction sites such as super high-rise and large building construction. there is almost no specific code and/or standard described in the specifications to check verticality for Pre-tensioned Spun High Strength Concrete pile installation process. The most commonly used method for the vortical PHC pile installation is a naked-eye measurement or water level measurement conducted by assistant crew in the construction sites. And recent analysis results of the pile cutting work revealed that it frequently makes a lot of cracks which significantly reduce the strength of the pile and is very labor intensive work, thus requiring a large amount of additional time, costs, and efforts. The main objective of the research is to analize problems and to improvement. measure of PHC Pile Construction. The improvement measure present to the main problem with survey and discussion.

• Korean Journal of Construction Engineering and Management
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• v.7 no.4 s.32
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• pp.78-90
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• 2006

There is no specific code and/or standard described in the specifications to check verticality for Pre-tensioned Spun High Strength Concrete pile installation process. The most commonly used method for the vertical PHC pile installation is a naked-eye measurement or water level measurement conducted by assistant crew in the construction sites. The main objective of the research is to develop the automated vertical controllable prototype equipment for PHC piles in order to achieve uniform construction qualify as well as improving safety and productivity. The paper explains the literature review on PHC pile and pile installation process, development of prototype, field test of the prototype and its performance evaluation in terms of quality and safety as well as productivity. The results of the research will lead the further researches on the automated pile installation system.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2018.11a
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• pp.185-186
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• 2018

Leakage problems in underground spaces of domestic apartments is becoming more serious and legal disputes related to leakage problem have become more commonplace. In this regard, leakage problem is not only a problem in construction, but is also a concern from a societal aspect. In this paper, we propose the details of a below-grade waterproofing design and specification standards of specific areas and sections of residential apartment buildings, and propose that a detailed examination of positive-side waterproofing methods is required.