This research was intended to confirm the reducing effects water leakage of the acicular thaumasite as admixture for mixing concrete structure, in case of the water leakage on underground structure

A study on the limit state design method for retaining wall structures are reviewed based on the National Retaining wall Design Standard. In this paper several retaining walls are calculated according to LRFD design criteria analysis using the program and the factor of safety for sliding and overturning. Comparing with their results, the Taylor's series simple reliability analysis was performed. In the futures more study should needed including reinforced retaining walls, earth anchor structures. Geotechnical data also are evaluated beforehand.

Offshore plant structures must be secured of structural safety applying real-time monitoring technology because they are in a state of very poor ocean conditions. In this study, Fiber Bragg Grating (FBG), sensors were attached to the scaled model of offshore floating structure, and put in scaled model in the water tank, and then calculated strain after measuring scaled model's wavelength through optical spectrum analyzer

This paper presents estimation of stiffness parameter on floating structure using dynamic properties such as mode shapes and natural frequencies. The stiffness parameter of the floating structure was estimated via system identification technique.

In this study, for estimation of accurate thermal loading for design and analysis of civil engineering structures analyzed the daily average temperature data which have been observed over the past 50 years by korea meteorological administration. Through statistical analysis of climatic data, presented basic data on the changes in the temperature of domestic unique for the design and analysis of civil engineering structures.

Recently remodeling has been preferred to reconstruction. Remodeling the existing building structure by recycling has great advantages compared with reconstruction in terms of environmentally contributions and reduced use of national resourses. However the story increase during remodelling cause serious problems of structure. This paper intoduces a way to analyze remodelled building using MIDAS GEN

For the seismic retrofit of the underground box structures, the seismic retrofit method using pressure members was developed. By the applied pressure on the reinforcing members, the size of the reinforcing members are reduced and the performance of seismic retrofit is imp

In this study, conducted an experiment for fire-resistance of silicone/inorganic flame retardant composites as fire resistant materials. Thermal characteristic analysis were performed by TGA(Thermogravimetric analysis) and Fire-resistance analysis performed by flame test. Through this study, we realized that the silicone/inorganic flame retardant composites have fire resistance and potential as Fire resistant materials.

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.