국내 고속도로 구조물 점검은 인력위주로 수행중에 있으나, 관리대상 구조물의 급증으로 인력점검의 한계가 발생함에 따라 4차 산업기술(IoT, 드론, AI, 로봇 등)을 활용한 점검로봇 및 점검장비를 개발하여 고속도로 구조물 점검에 활용할 예정이며, 구조물 상태 자동 평가기술을 개발하여 안전점검의 신뢰성 및 효율성을 향상할 예정이다.

Structures are currently a good condition in highway, with an average age of 14.7years. However, After 10 years, The old structure will be estimated 22% of the total structure. In this study, We have suggested the preventive maintenance methods such as preventive techniques and asset management for the deterioration of future by a lesson of failure cases of developed countries such as the United States.

This paper presents the results of the long-term behavior of PC(Precast Concrete) culvert using ferronickel slag blended cement.

The Construction-Operations Building information exchange (COBie) is a standardized format to deliver information from the building information model (BIM) to the facility management (FM) system. The purpose of this study is to propose a COBie-based structural maintenance document which can record and review the information with regard to structural safety inspection and maintenance of buildings.

As for the recent need for maintenance of aging structures and tall buildings, the traditional structural inspection and management methods are expected to be enhanced with the automated structural health monitoring system. The system identification technique is deem to be a core deem of the structural health monitoring. In this study, a methodology of structural stiffness estimation is proposed to identify the state space model of the target structure from the dynamic behavior measurement data of the structure. Experimental verification of the physical quantity estimation technique is conducted.

In this paper, damage assessment technology based on statistical pattern recognition technology was developed for maintenance of structure and the performance of the developed technology was verified by vibration test. The damage assessment technique uses the improved Mahalanobis distance theory, which is a statistical pattern recognition technique, and developed to take account of the variability between the measured data. In order to verify the damage evaluation performance of the developed technology, a cable damage test was conducted for a cable-stayed bridge. Experimental results show that the developed damage assessment technology has the capability of extracting information that can determine the location of damage due to cable damage.

In this study, concrete box structure was analyzed for reinforcement of the corner using the proposed pre-flexed steel members, Numerical results confirmed that the proposed reinforcement method can enhance the load capacity of the concrete box structures.

Occurring economic loss of economics by the earthquake, such as Gyeongju and Pohang in Korea, interest in seismic stability of facilities is increasing. Electrical Cabinet Structure in Power Plant should be prepared for malfunctions and its structural safety should be ensured as well an earthquake event. The purpose of this investigation is to increase the seismic stability of the cabinet. Through finite elements analysis, dynamic characteristics of the cabinet were identified herein, and time history analysis was performed by converting the design response spectra. In order to improve safety against earthquakes, a variable analysis was conducted to utilize steel dampers for seismic retrofit of the cabinet, and time history analysis results compared with the response of basic and seismic retrofitted cabinets.

The seismic performance evaluation of domestic thermal power generation facilities is not significant compared to its importance. Therefore, in this study, seismic performance evaluation of the chimney structure responsible for the exhaust function in the thermal power plant was performed using Abaqus, a finite element analysis program. As a result, we could obtain the flexural strength curves of concrete compressive failure and relative displacement of stack.

Thermal power generation was a very important power source in Korea. Therefore improvement of seismic reliability of the thermal power plants is required, because occurrence of very large earthquakes is expected in Korea. Especially, after the earthquake in Gyeong-ju and Po-hang, seismic waves are recognized as a new problem in Korea. In this study, numerical analysis was carried out in order to investigate behavior of the boiler structure in the thermal power plant under earthquakes. The effect of the developed hybrid damper is analytically confirmed.

Recently many investigations have been conducted to evaluate and analyze the seismic response of structures equipped different types of damper. Viscous dampers are known as effective energy dissipation devices improving structural response to earthquakes. The damping force developed by the viscous damper depends on internal structural system and the physical properties of the fluid used in the device. This study has developed a viscous damper for vibration and seismic control of structures. In order to verify the performance of a viscous damper, experimental tests were performed.

Friction dampers are categorized as displacement-dependent energy dissipation devices, because their damper force is independent from frequency and velocity. They have found large practical application in seismic retrofitting of existing structures due to their low cost and simple installation. A typical friction damper consists of series of steel plates tighten together with high durability steel bolts in order to achieve more reliable friction through the interfaces. This study developed a multi-friction damper by laminating friction materials. In order to verify the performance of the multi-friction dampers, experimental tests were performed.

In thermal power plant, steam is made by boiler. As it rotates turbine, electric power is generated. Thermal power plant has a high-rise structure that has a boiler and other equipment. Thermal expansion of the boiler is large because combustion temperature is high. The boiler vibrates easily because it is suspended from the top of the support structure in order not to restrict deformation by thermal expansion. Thus, the boiler structure supported by the hanger is very vulnerable to earthquakes. In this study, numerical analysis was carried out in order to investigate behavior of the boiler structure in the thermal power plant under earthquakes.

In this study, structural tests were performed for the para-aramid fiber-reinforced RC beams using Recycled Coarse Aggregates (RCA) according to the main parameters which are RCA replacement ratio (0 and 30%) and para-aramid fiber volume fraction (0, 0.75 and 1.0%). Experimental results show that by reinforcing para-aramid fibers, compared with the natural coarse aggregate, the RCA, which exhibited low structural performance, improved load carrying capacity and ductility.

The purpose of this study is to understand the structural performance of the specimens beam by changing the depth and width of the U-shaped composite beam. To this end, experimental specimens by changing depth and width as compared with a reference specimen were prepared and tested. As a result of this study, growth of the depth has great effect on the structural performance while a width increase has no significant effect on the structural performance of composite beam.

This research provides a method that can be conveniently and easily to apply the prestressing force to concrete structures incorporating shape memory alloy fibers. For this, discrete shape memory alloy fibers were manufactured to be mixed with cement mortar. Then shape memory effect was generated to evaluate uplift displacements at the mid-span of the mortar beams with increasing fiber volume fractions.

In order to improve the traffic congestion on the road, it is essential to construct overpasses and highways in big cities. In particular, in order to facilitate traffic flow within the overpass route, it is necessary to construct a curved bridge because the plane shape of the bridge itself must be aligned with the road alignment. Therefore, in this study, we have developed a precast PSC curved girder of concrete hollow box type with excellent bending moment, shear force and torsional moment resistance, and perform performance evaluation by structural test to confirm applicability to curved bridge.

This research provides techniques for the implementation of an integrity evaluation system developed for wind turbine structures to jack-up barge. The strain values obtained from the upper tip of the footing are to be converted into values at a single point in order to represent the structural behavior. These obtained values are evaluated simultaneously through P-M curve, generated by FEM results. Evaluating loads with P-M curve, structural stability of barge could then be monitored.

Purpose - This study attempted to construct and validate a structural model of the relationship between the quality of medical services, perceived risk, reputation and customer satisfaction, which is the main concept of the relationship between large hospitals as well as small and medium hospitals and medical consumers. Through this verification, the small and medium hospitals are to find the way for wise coping in competitive situation with large hospitals. Research design, data, and methodology - This research developed a hypothesis by constructing a structural equation that reaches the satisfaction and the relationship between reputation of perceived risk and perceived risk of service quality perceptions of customers of small and medium hospitals. Research data were collected through a questionnaire survey of respondents who had medical service experience from small and medium hospital. A total data of 252 respondents were used as the sample for the final analysis and analyzed using SPSS 23.0 and AMOS 23. Results - As a result, the relationship of quality of medical service, reputation, and customer satisfaction among small and medium hospitals was consistent with the results of precedent studies, and the perceived risk has a significant impact on reputation, so the greater the perceived risk, the higher the preference for reputable medical institutions as large hospitals. In addition, it was found that the direct route from perceived risk to customer satisfaction was not significant, and reputation was found to have a full mediating effect on perceived risk and customer satisfaction. Customers who use small and medium hospitals prefer to use reputable medical institutions if their perceived risk is high, which is different from risk perception when specific targets are specified. Conclusions - In terms of the effect from customer satisfaction, not only the path of perceived risk → reputation → customer satisfaction, but also the quality of service quality → reputation → customer satisfaction. These findings suggest that small and medium hospitals are appropriately responding to competition with large hospitals, rather than focusing on the perceived risks and reputation of customers in establishing and utilizing competitive strategies to create new customers and preserve existing customers