This study examines preventive technology that is to control the leak by rebuilding the waterproofing layer using adhesive gel for the damaged area expected to raise any disaster if there are making leakage in an underground structure.

The systematization of construction information is required over whole life cycle of facilities to improve productivity of construction industry. BIM has been actively suggested as one of alternatives. However, it may be currently concentrated on the large-scale facilities while the small and medium-scale facilities based on BIM are slightly treated in indifference. This study has been performed to set up information management system based on BIM considering characteristics of small and medium-scale facilities. PLIB of ISO and construction information classification system of by MLTM in Korea are used in this study.

This report analyzed the types of damage occurring in small scale safety vulnerable buildings inspected in 2012, by both structural types and elapsed time. The results of the analysis show that more than 70% of damage on finishing or usability by non-structural elements is recoverable for its intended performance. Facilities over 20 years from compleetion have more than a 30% structure damage ratio, than can be dangerous for structural safety, and requires periodic check-ups and repair/reinforcement work to recover its performance.

This paper is introduced to construction and operation of the BMS(Bridge Management System) for structure management of long-span bridge. one of the best long span bridge for marine bridge in korea is Incheon bridge. Incheon bridge have applied to BMS for bridge management from construction period to operation and management period. Incheon Bridge during the bridge life cycle by taking advantage of the BMS systematic and efficient inspection management system is available that can extend the life of the bridge by building bridges and management history, and during the operation

The importance of plant pipe rack safety management has been increased. In this study, a plant safety management system based on IoT(Internet of Things) was constructed in Yeosu Industrial Complex. The purpose of this study is to investigate the structural characteristics performance and structural health monitoring of pipe rack using measured data

this paper, we developed an integrated program which enables users to control the image acquisition hardware and the image processing software for inspection of structures. We enhanced an the existing program which is only used to detect the surface damage from an digital image.

As numbers of tunnel are increased, the necessity of temporary maintenance works of those tunnels is also increased. This study introduces new space truss frame system for the maintenace of tunnels. Proto-type model was analyzed and evaluated. The result shows that new system may contribute to save the maintenance cost and time.

A noncontact nondestructive testing(NDT) method is proposed to detect the damage of plate-like structures and to identify the location of the damage. To achieve this goal, a scanning laser source actuation technique is utilized to generate a guided wave and scans a specific area to find damage location more precisely. The ND: YAG pulsed laser is used to generate Lamb wave and a piezoelectric sensor are installed to measure the structural responses. The measured responses are analyzed using 3 dimensional Fourier transformation. The damage-sensitive features are extracted by wavenumber filtering based on the 3D FT. Then, flaw imaging techniques of a plate-like structure is conducted using the damage-sensitive features. Finally, the plates with notches are investigated to verify the effectiveness and the robustness of the proposed NDT approach.

The ISTIMES project, funded by the European Commission in the frame of a joint Call “ICT and Security” of the Seventh Framework Programme, is presented and preliminary research results are discussed. The main objective of the ISTIMES project is to design, assess and promote an Information and Communication Technologies (ICT)-based system, exploiting distributed and local sensors, for non-destructive electromagnetic monitoring of critical transport infrastructures.

Recently, an interest in volcanic eruption of the Mt. Baekdu is increasing. If the Mt. Baekdu has volcanic eruption, volcanic ash and earthquake will occur. These can give moderate or severe damages to the structure. But the studies of volcanic earthquake and structural damage by volcanic earthquake is not enough. In this paper, structural damages by volcanic earthquake were investigated and analyzed in connection with VEI-Magnitude and Distance-Magnitude relationships.

The purpose of this study is to suggest new improving solution about problems of non-destructive test through the analysis of present status of non-destructive test and report. For this, we analyzed problems of non-destructive test operating into concrete structures and collected data by questionnaire of non-destructive test at the inspection and diagnosis work for the diagnosis company and suggested plans for improvement based on analyzed opinion and result.

For this study, Inspection and test was carried out in Tunnel. After this process, Numerical Analysis was accomplished by 3D. A result of inspection and test, It couldn't find the reason why the upper slab crack was detected. The result of 3D Numerical Analysis, The reason was found that the Demage on upper slab was caused by moment change. The Moment was changed by column interval transition. To figure out the cause of cracks, we are using FEM. This Study can help developing designation and maintenance about Tunnel.

본 논문에서는, 자이로스코프를 이용한 각속도 계측과 가속도계를 통한 가속도 계측을 통해, 기존 의 가속도 계측만을 통한 교량구조물의 건전성평가의 단점을 극복하고자 한다. 교량의 경우, 지점 부근에서는 각속도 변화가 큰 반면, 중앙경간으로 갈수록 그 값은 작아지고, 가속도 변화가 크게 발생한다. 이러한 교량의 거동 특성을 통해 가속도 계측을 통한 건전성 평가에서 간과할 수 있는 지점 부근의 손상을 지점 부근에서 계측된 각속도를 이용해 보상하는 방법이다. 즉, 가속도 계측치를 이용하여 구조물의 모드유연도 행렬을 구성하고, 이를 이용하여 일차적인 손상진단을 수행한다. 추가 적으로 지점부근의 각속도 계측을 이용해 얻어진 회전 모드유연도 행렬을 이용하여 지점부근에서의 손상진단을 수행한다. 제안된 방법의 검증을 위해서 단순보를 이용한 수치해석을 수행했다. 중앙 부근의 손상과 지점 부근의 손상을 모사하였으며, 제안된 방법의 우수성 검증을 위해 가속도 계측만 을 통한 결과와 이종 데이터 계측을 통한 결과에 대한 비교연구를 수행했다.

본 연구에서는, 모드유연도 행렬 기반 변위를 이용한 고층빌딩의 손상진단 알고리즘을 제안한다. 손상에 의해 유발되는 손상유발 층간 변위의 관계식을 통해 고층빌딩의 손상진단을 위한 손상지수를 제안하였으며, 다중손상의 손상추정을 위한 베이스라인 변경기법을 제안했다. 제안된 방법은 수치모 델이 필요하지 않으며, 계측된 신호처리만을 통해 고층빌딩의 손상추정이 가능하다는 점, 그리고 다중손상에 대한 손상추정이 가능하다는 장점을 지닌다. 제안된 방법의 성능검증을 위해 10층 빌딩모 델에 대한 일련의 수치해석을 수행했다.

64 percent of overall highway is concrete pavement, and the age of Chungbu highway is over. It is desirable to use same material for the maintenance of concrete pavement, but asphalt overlay is commonly used because lane closure time is directly related to the curing time of concrete. However, there is no study conducted on structural performance of concrete pavement after damaged surface cutting. Therefore, falling weight deflectometor was used to evaluate structural evaluation of both asphalt pavement overlay concrete after cutting and asphalt pavement overlay, and 1.5 time higher deflection and 5.5% reduced load transfer efficiency were observed in cutting overlay comparing against non-cutting overlay. These observations indicate that there is high possibility of reflective cracking in case of cutting overlay due to increased deflection and reduced load transfer efficiency

In this study trying to develop a monitoring system for temperature and humidity measurement of quality control methods suitable for curing concrete nuclear power plant structures. This experiment is divided part of data logger, sensors, control program in a accordance with standar of quality control Nuclear power plant hot weather/the middle of summer. This measuring method is expected to development quality control nuclear power plant

In this paper, the utilization of PZT’s dual piezoelectric effects (i.e., dynamic strain and electro-mechanical (E/M) impedance responses) for damage detection in beam-type structures are presented. In order to achieve the objective, the following approaches are implemented. First, global vibration-based and local impedance-based methods to detect the location of damage are presented. Then, the vibration-based and impedance-based damage detection methods using the dual piezoelectric responses are evaluated from experiments on a lab-scaled beam.

In this study, fire test of predicting fire behavior(fire growth rate, temperature of compartment, etc.) were performed for fire safety diagnosis in buildings. From this test, fire propagation for each combustible was identified, which was delayed compared to the summed heat release rate fo a single combustible. Also, comparison with Matsuyama model allowed improvement in the modeling of the process of fire spreading to nearby combustibles

This study investigated the House of Commons through the combustion characteristics of the flammable after performing the experiment for predicting fire constellation is to present basic material. Combustibles of the House of Commons was established to investigate through the standard model, such a list of proposed standards for the combustible

Korea rapidly arranged urbanization and overpopulation with high growth of economy and all kinds of decrepit facilities are scattered all over the downtown. If there is a strong wind in fire, fire is rapidly increased by various fire spread factors. And Korea cannot build prediction model of urban fire combustion phenomena because there is no studies that physically explains the suitable flame phenomena for its real state. In this study, based on the Japanese Urban fire simulation to target the dense building and suitability of fire risk assessment were reviewed