• Magazine of the Korea Concrete Institute
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• v.14 no.5
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• pp.40-46
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• 2002

산업화 도시화에 따른 건축물의 밀집과 고층화의 환경에서 화재 재해 발생은 인명피해 및 재산피해에 치명적인 결과를 가져올 수 있으며 화재로 인한 인명 및 재산 피해는 두말할 것도 없이 막대한 국가적 손실을 초래한다고 할 수 있다. 따라서 화재발생을 사전에 억제하는 구조물의 방화ㆍ내화구조 및 피난계획, 소화설비 소화활동설비 등에 대한 방재 연구와 더불어 화재발생후 화재의 원인조사와 구조물의 재사용 여부 또는 보강 필요성, 자산의 평가의 과학적인 근거를 위해 신뢰성 있는 안전성 평가에 대한 연구가 필요한 실정이다.(중략)

• Journal of the Korean Society for Nondestructive Testing
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• v.21 no.2
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• pp.213-226
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• 2001

최근 가속화되어 가는 산업발전으로 인하여 산업구조물 및 기계 부품의 안정성 및 비파괴 검사에 대한 요구가 크게 대두되고 있다. 이는 곧 산업구조물 및 제품의 품질 향상을 위한 기존의 검사방법으로는 제품의 완성도를 높이기 어렵다는 것을 의미하며, 제품의 질을 향상시키기 위해서는 새로운 비파괴 평가방법이 필요하다는 것을 의미한다. 또한 모든 구조물의 보수 유지 및 안전성 진단의 차원에서 모든 산업적 구조물의 변형과 응력, 진동모드, 미소3차원 형상에 대한 평가 및 해석은 구조물의 수명과 관계되어 그 중요성이 크다 할 수 있다. 이에 본고에서는 기존의 비파괴검사 방법들이 많은 장점이 있음에도 불구하고, 단점을 극복할 수 있는 평가 기술로서, 고체재료 및 산업구조물 - 기계구조물, 전자 부품, 배관, 토목건축 구조물 등 - 의 변형, 결함, 균열, 응력 등을 검사 및 평가할 수 있는 광학적인 비파괴 평가 방법에 대해 소개하고자 한다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.24 no.4
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• pp.10-17
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• 2020

The recent earthquake in Korea caused large and small damages to many school building. School building is an important building that is used as a shelter in the event of disaster. Among the seismic retrofit methods, the internal steel braced frame type method is used for its relatively easy construction and excellent performance. In this study, the maximum shear force and displacement were compared and examined by applying the brace frame to existing concrete school buildings. As a result, we verified the adequacy of the analytical model and compared and examined the effect of brace-height ratio on the span of the existing school buildings. The adequacy of the maximum shear force and displacement relationship can be confirmed in the model with a length of 0.3. In addition, seismic frame was applied to the actual non-seismic reinforced concrete school building, and the seismic performance was evaluated by nonlinear static analysis(Push-over analysis) according to the ratio of brace-height. As a result, the increase of the brace-height according to the brace-height ratio has the effect of increasing the maximum shear force and maximum load at the performance point. But the collapse of the braced frame due to the increase in the lateral stiffness occurred, indicating that seismic retrofit according to the proper brace-height is necessary. Therefore, in the seismic retrofit design of brace frame of existing school building, it is necessary to select the proper brace-height after retrofit analysis according to the brace-height ratio.

• Journal of the Korea institute for structural maintenance and inspection
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• v.12 no.4
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• pp.71-78
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• 2008

In the case of the railway bridges, uplift forces were occurred at the edge of the segments when vehicular loads were applied. These forces caused the compressive and tensile forces in the fastening system. In the past, a structural analysis has been performed to investigate the safety of fastening system which was modeled with one directional spring elements based on the compressive test of fastening system. In this case, the stiffness of the spring element was obtained from experimental study which was conducted by compressive load. Therefore, to perform rational and exact structural analysis, the translational stiffness of the fastening system obtained from the experimental study applied the tensile load and the rotational stiffness should be considered because it was occurred the tensile force as well as the compressive force in fastening system. In this study, an elastic and inelastic experimental study was performed for six specimens. The translational stiffness along the vertical axis of rail and the rotational stiffness along the strong axis of rail were investigated, also structural behavior of the fastening system was analyzed.

• Journal of the Korea Safety Management & Science
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• v.25 no.4
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• pp.73-78
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• 2023

It is very important to evaluate how the functions of products, facilities, and spaces affect human life. The evaluation of these actions has legal regulations such as certification, inspection, and diagnosis, and the degree of quality, safety, and excellence of the results is announced. This study sought to secure safety through efficient system operation by reviewing safety-related certification systems established and implemented by each government department in Korea and analyzing the characteristics of each system and similarities between systems. There was also an aspect of cross-checking safety through the certification and diagnosis system implemented by each ministry, but it was confirmed that the efficiency of the system should also be considered in terms of overlapping application. Therefore, when securing safety is confirmed based on each safety-related law, active alternatives such as exemption, substitution, delegation, etc. should be presented.

• Journal of the Korea institute for structural maintenance and inspection
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• v.7 no.2
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• pp.231-238
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• 2003

Reinforced concrete buildings damaged by earthquake which can be reused can ensure the stability in its structure by repair-restrengthening, but when such a repair-restrengthening is conducted inappropriately or its structural strength is greatly reduced by earthquake again, it should have repair-restrengthening. This study selects beam-column joints which are vulnerable to earthquake as the object of experiment, performs repair-restrengthening after applying the first and the second dynamic loading to the objects of experiment, examines the capacity of restrengthening according to structural characteristics and loading velocity and verifys the validity of repair-restrengthening.

• Journal of the Korea institute for structural maintenance and inspection
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• v.6 no.2
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• pp.233-244
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• 2002

The purposes of this research are to use the buildings efficiently and long, save energies, make the cozy and comfortable environment of residential and living spaces, rearrange the related acts for easy implementation of remodeling, and activate the government's support programs so as to make remodeling activated in a safe mode. The scope and methodology of this research include the review of existing literatures and data on remodeling, census on apartment residents, influence factors, and the development of methods for activation of building remodeling and strengthening of safety management, like activation measures, licensing and ordering regulation updates, etc regarding the remodeling. Safety inspection and in-depth inspection before and after remodeling should be regulated. The construction materials for remodeling should be light weighted and the construction methods which can minimize the impact and vibration during construction should be selected. The improvement of regulation on the remodeling contractor qualification and order method should be updated. If the remodeling is activated and safety management is reinforced by the suggested measures, solving of lack of house, prevention of abuse of resources, and improvement of residential environment could be accomplished rationally.

• Journal of the Korea Institute of Building Construction
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• v.4 no.1
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• pp.8-15
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• 2004

1997년 11월 IMF 영향에 따른 ○○건설사의 부도로 인해 1년동안 ('97. 11∼'98. 11) 공사가 중단된 채 방치되어 많은 문제점을 안고 공사를 재개하지 못하고 있는 현장이 전국에는 아직도 100여개 정도 산재해 있는 것으로 알고 있다. 이와 같은 현장의 공사재개를 위해서는 다음과 같은 문제점을 검토해야 한다. 첫째 기술적 문제점으로는 기초와 지하주차장 골조공사가 일부 시공중 중단되어 철근이 1년 동안 방치된 채 부식되어 있어 구조물 안전진단은 물론 부도에 따른 기 시공 협력업체들의 채무정리(22개사)에 대한 문제가 해결되지 많아 공사의 재개에 많은 어려움이 있으므로 충분한 사전검토가 필요하다. 둘째 외부적 문제점으로는 그동안 공사중단으로 인한 입주자들에 대한 신뢰확보 즉 조합 및 분양자들이 건설사의 부도로 인한 중도금 납입 거부상태는 물론 선납금, 연체이자 등의 경제적 피해 손실로 발주처에 대한 집단소송 진행 등에 따른 건설사 및 발주처에 대한 불신 해소를 어떻게 하느냐가 공사재개의 중요한 관건이었다.(중략)

• Journal of the Korea institute for structural maintenance and inspection
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• v.19 no.2
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• pp.92-98
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• 2015

Recently, buildings tend to be large size, complex shape and functional. As the size of buildings is becoming massive, the need for structural health monitoring (SHM) technique is increasing. Various SHM techniques have been studied for buildings which have different dynamic characteristics and influenced by various external loads. "Abnormal behavior point" is a moment when the structure starts vibrating abnormally and this can be detected by comparing between before and after abnormal behavior point. In other words, anomalous behavior is a sign of damage on structures and estimating the abnormal behavior point can be directly related to the safety of structure. Abnormal behavior causes damage on structures and this leads to enormous economic damage as well as damage for humans. This study proposes an estimating technique to find abnormal behavior point using Hilber-Huang Transform which is a time-frequency signal analysis technique and the proposed algorithm has been examined through laboratory tests with a bridge model using a shaking table.

• Journal of the Korea institute for structural maintenance and inspection
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• v.20 no.4
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• pp.1-8
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• 2016

Recently, buildings tend to be large size, complex shape and functional. As the size of buildings is becoming massive, the need for structural health monitoring(SHM) technique is ever-increasing. Various SHM techniques have been studied for buildings which have different dynamic characteristics and are influenced by various external loads. Generally, the visual inspection and non-destructive test for an accessible point of structures are performed by experts. But nowadays, the system is required which is online measurement and detect risk elements automatically without blind spots on structures. In this study, in order to consider the response of non-linear structures, proposed a signal feature extraction and the adaptive threshold setting algorithm utilized to determine the abnormal behavior by using statistical methods such as control chart, root mean square deviation, generalized extremely distribution. And the performance of that was validated by using the acceleration response of structures during earthquakes measuring system of forced vibration tests and actual operation.