In this paper, we developed a performance evaluation system which enables to evaluate surface condition and sectional shape change of structure. We use various convergence technology such as 3D laser scanning, digital image processing and texture mapping. This modular system is quite practicable in matters of many current structures. This system can solve the problems in current visual inspection of structures, and systemize the inspection tasks scientifically.

In this Study cable tension of existing cable-stayed bridge is measured by non-contact laser vibrometer, and applicability of a non-contact vibration measurement method is experimentally evaluated. According to the analysis results, the non-contact vibration measurement method reveals an error of less than 5%, and could be efficiently applied to a rapid measurement for nonstationary response analysis of bridge structures.

It will use the Schmidt hammer law, the supersonic waves speed law and the composition law in the concrete Korean mandolin lump examination law from the research which it sees consequently and proposal of the usual concrete and existing regarding the high-in-tensity concrete the comparison which will be cool it will analyze and compared to accurately the burglar presumption which is the possibility of buying the compressive strength of the concrete it will be cool and it proposes.

Recently, many researchers have been executed on functional concrete in various fields. Especially, some researchers on added material for functional concrete are executed to improve the indoor air quality in daily living space. The indoor air quality was estimated by reducing capacity for the concentrations of formaldehyde. The main objective of this study is to provide a model to predict optimal amount of added material for functional concrete.

In this paper, it is estimated the causes of wooden crib wall through detailed diagnosis and analysis of a crib wall construction site. As a results, it is occurred the damage in the members of about 6% in a total locations and the 65.7% of the damaged header are concentrated in the lower part of crib wall. Therefore, it is analyzed causes of wooden crib wall depending on the setup position and the kinds of members. It is considered basically the members of various forms of distortion and the grain affecting.

Causing damage to the actual structure is not easy for new evaluation techniques to validate the damage. Creating a new structure for the validation that is expensive and requires a lot of time. So to verify the techniques using scale model is a common and effective way. For the validation of new techniques, it was to make a scale model of the cable-stayed bridge type and various damages were caused to the bridge model.

Recently, Maintenance and inspection of plant are now being actively studied with the development of plant industry. In this paper, A leak detection in piping facilities using thermal imaging camera is proposed. This method was verified by laboratory experiment. In future, Appropriate algorithm will be applied to this method for real time detection and finally applied to the plant that is the ultimate goal of this study.

Structural dynamic properties such as natural frequency depend not only on damage but also environmental condition (i.e., Temperature). Without removing the variation of environmental condition in the damage detection, false-positive or negative damage diagnosis may occur so that structural health monitoring becomes unreliable. One of methods used to solve this problem is to construct regression model based on structural responses with the environmental factors. However, it is difficult to determine where and which environmental variables to measure. One alternative is to remove the variability due to environmental variation without measurement of environmental variables. However, the performance of this method is depending on how to define the reference data set. Generally, there is no prior information on reference condition (i.e., healthy condition) during data mining. Reference condition is determined based on subjective perspective with human-intervention. To overcome the drawback of current methods, this paper investigates adaptive PCA technique for the monitoring of structural damage detection under environmental change. This method is not required to determine the reference condition and measure the environmental variables. Proposed method is tested on numerically simulated data for a range of noise in measurement under environmental variation.

To maintain the tension force of PS members is a very important issue for the safety of PSC structures. In practice many cases of corrosions and tensile force reduction in PC tendons, however, are reported from various causes. In the near future, thus the estimation of tensile forces in PC tendons would be major work of maintaining PSC structures. In this study, the approach using magnetic characteristics of PC tendons to estimate tensile force was investigated. Using simple but reasonable test procedures, the possibility of the approach like this was verified.

In case of measuring strength of concrete using ultrasonic pulse testing, setting reasonable range of limitations to get reliable strength data results is highly recommended. To resolve this issue, ultrasonic testings were performed on several concrete specimens ,randomly selected and contain strength ranged from 20 to 200MPa, to measure values of ultra sonic velocity and actual strength. Then advanced data analyses were performed based on the results from the experimental works.

The purpose of this study is to suggest standardization solution about non-destructive testing of concrete structures. For this, we analyzed the present condition of non-destructive testing in domestic and based on it, we suggested a draft of standard plan for improvement of reliability and quantitative analysis in the result of non-destructive testing

Railway construction is divided into trackbed and railway. The railway is divided into the gravel ballast and the concrete ballast track structures. In recent years, concrete ballast track construction is increasing for Durability and Maintenance. But During construction or operation for characteristics of concrete, defects of sleepers and concrete ballast track may arise. Some of the defects was analyzed that the main pattern and this study will be introduced in that pattern.

This study proves that the prestress loss occurs at the continuous joint by the local bending of tendon due to the construction deviation and the curvature of radius. Also, a method that can reduce the prestress loss is proposed, and proved by the experiment.

Maintenance of plant facilities are becoming important due to lots of recent plant construction. While maintenance of plant facilities are performed, maintenance of plant structures are usually not carried out properly. In this paper, measurement threshold estimation algorithm is developed for maintenance of pipe-rack structure. Currently, field verification of the developed algorithm is being performed on a real pipe-rack structure.

This reasearch was performed to evaluate CO2 emission of Modular bridge quantitatively. Preferentially, Modular bridge was separated steel girder bridges, concrete girder, concrete slab bridge and analyzed process in doing configuration W.B.S system. According to the Ministry of land guidelines, each process was divided into material, transportation, construction and calculated by division in detail the materials and fuel so it planned that quantitative assessment can be achieved.

The study was conducted for the purpose of determining the size of the floor area of super-tall building by use. So, considering the urban capacity in the region around the super-tall buildings, it has been developed for the prediction methodology of the size. Through the information of the buildings and the cadastral, the correlation and regression analysis were performed by 18 super-tall buildings located in Korea As a result, the residential floor capacity was under the influence of land use of residential and green space, and the business floor capacity was under the influence of land use of green space. Hotel and commercial area, where as the land use and has shown significant results that do not. of a building the size of the surrounding areas for residential and green space and commercial floor area size of the impact of land use for was larger. Hotel and commercial floor capacity, where as the land use and has shown significant results that do not. After this study, it is need to the consideration of the urban capacity around region and supertall buildings to enhance the role of public of supertall buildings. And it will be need to improve the accuracy of prediction with applications to the information of buildings around the region of supertall buildings.

We have carried out the bridge inspections according to the laws not considering the characteristics of damages. It is reasonable to classify the inspection interval according to the risk of each bridge. This suggests the risk based inspection inspection methodology.

Flood and scour are one of the major causes of bridge collapse. However, maintenance and inspection techniques still need improvements especially for underwater structures like bridge piers. Conventionally, manual inspection by divers has been carried out for underwater structures of bridges. This has difficulties in gathering accurate and reliable field data under severe environmental conditions. For this reason, underwater inspection is carried out using Side Scan Sonar(SSS) recently. The underwater structure image can be obtained by observing the reflected beam signal from underwater riverbed and surface. Signal and image processing techniques are employed in order to produce a clearer 2D image. Conventional inspection using one Side Scan Sonar is carried out to obtain river bed and underwater structure image. In order to reduce the inspection time, two Side Scan Sonar are used to obtain river bed and underwater structure image simultaneously. Two Side Scan Sonar were used to confirm the usability of the interference effects, which can occur by using the same frequency as the image at the time of collection, through indoor experiment for verification.

In this study is to develop hydrological and geotechnical analysis module and risk analysis and assessment tool for the development of the dam safety management decision-making support tool D-SMART. Analysis module is composed of two parts. One is the initial load probability result part to the hydrological and an earthquake characteristic, the other is system response probability result part.

In this study, the methods of structural analysis modeling for establish the structural health monitoring system of super tall buildings was proposed. The analysis was conducted through the stages of construction and the results was reflected to the final analysis model.