Semi-Rigid Pavement is one of excellent paving methods adopting merits of Ascon and concrete paving. But, it has placed just only normal road pavement. In this case, we have constructed Semi-rigid pavement method at Deck pavement on service bridge and we have estimated Semi-rigid pavement as a new paving method replacing Ascon and concrete pavement.

This study presents a technical overview of snow and ice accretion on cable-stayed bridges and suspension bridges. Specially, it focuses on measures against snow or ice falling into bridge decks. Many different types of de-icing and anti-icing are discussed in this paper.

Recently, Large Diameter Shield TBM method is being adapted to several domestic construction sites. Therefore, it is really necessary for the maintenance technology about long-term serviceability and durability of shield tunnel. In this paper, it would arrange the basis for reasonable evaluation of tunnel by the data analyzing through the site investigation concerning the crack and leakage which can occur by the maintenance of domestic large diameter shield TBM method.

The damping ratios of the modes as well as the natural frequencis and the mode shapes are required to characterize the modal behavior of structure. The mode shapes and the natural frequencies are determined from analytical methods or measurements accurately. But there is little analytical basis for estimating the damping ratios although they are the most important to determine the amplitude of the vibration. Especially for the cable-stayed bridges the aerodynamic damping ratios determine the amplitude of the response to wind loads. This paper is an attempt to estimate the aerodynamic damping ratios based on measured data and quasi-static theory.

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.

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

Marine bridges are deteriorated due to the exposure under marine environment. The structure deterioration occurred by corrosion of steel in concrete is mainly relevant to chloride in seawater. The cathodic protection technique is an unique measurement to stop the corrosion of steel. In this study, the detail maintenance strategy of cathodic protection system in KEC's experience is introduced.

A bridge is composed of many elements as deck, girder, pier and so on. The deterioration characteristic for each element is useful to establish the maintenace strategy and to determine the inspection interval. This study analyzed the derioration rates of bridge elements in Korea Expressway with a lot of precision safety diagnosis reports.

To suggest the preliminary data for effective maintenance of bridge structures, the damage patterns of expressway bridges are quantitatively analyzed in the present study. Damages detected in concrete deck slab, girder(concrete/steel), abutment and pier are classified into damage patterns and details. From this study, the damage characteristics of expressway bridges are figured out, and most of damages are defect which is resulted from a shoddy and fault construction

The purpose of this paper is to improve the method for rear cavity inspection of cut-off wall at concrete faced rock-fill dam. To do this, we suggested that using impact echo wave, analysis of embeded instruments data, and numerical method to considering the expecting crack open failure behavior. We hope that improved methods were assist maintenance of concrete cut-off wall at concrete faced rock-fill dam.

Characteristic structures of type 2-arch tunnel is exposed to the air outside of the central wall. It can not expect more than freeze resistance by geothermal, low-temperature phenomena long period of temperature decrease below freezing is becoming than in the past. Central wall of concrete freeze line will reach drainage layer because these low-temperature phenomena. It should be freezed to occur by the water flowing into the tunnel.

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 natural hazard occurrences such as landslides, debris flows and natural/artificial slope failures were mainly caused by typhoons and extremely heavy rainfall. In order to reduce these natural hazards the efficient countermeasure methods were need to reduce the landslide and debris flow caused by variations of precipitation patterns. The positively countermeasure coping with the debris flow hazards should have to estimate mainly progress to construction of barrier facilities based on the predicted results of potential hazard types and its scales as well as establish and enforce actively maintenance of the barrier facilities. In addition we also emphasized the necessary to the types of barrier facilities and institution improvement in order to positively hazard reduction of debris flow.

As most infrastructure have low natural frequency for vibration, an energy harvester to operate wireless sensors for them should be aimed to low frequency and have high output efficiency. This study proposes the energy harvester with parallel-connected single crystal ceramic for low frequency in order to gain enhanced efficiency. The performance is confirmed by the experiment using the acceleration data of hangers in Yeongjong Bridge.

Measuring displacement data is very useful as it can be applied to static, quasi-static, and dynamic behavior of structures. GNSS system is used to measuring displacement of structures. In this study, test bridge model was made to evaluate GNSS singnal characteristic.

After test track was constructed in 2009, maintenance works have performed for 14 months to check the stability of dedicated lane. Consequently, we get to know to keep the bleaching of signs and the crack of road surface in mind for effective maintenance of the dedicated lane hereafter. And dedicated lane with natural lawn is expected to decrease the heat island effect of conventional road if constr

The sensors currently installed for bridge monitoring are faced with limitations in terms of the application and effectiveness of such systems in current long sized bridges, which are developing rapidly in terms of both size and function. Global Navigation Satellite System (GNSS) has been noted as an only way to overcome the limitations of such sensors. This is because they have numerous desirable characteristics that outweigh their high cost. However, GNSS installed for bridge monitoring has been used so far only in measurement of bridge displacement. Therefore, in this study, verify the usability of GNSS through correlation analysis between deflection and temperature

Recently, as a number of long span bridges are constructed, the various studies have been focused on bridge health monitoring system (BHMS). Also, Global Navigation Satellite System (GNSS) is being spotlighted as new concept sensor for BHMS because of its unique advantages. However, GNSS installed for bridge monitoring has been used so far only in measurement of bridge displacement. Therefore, in this study, the dynamic characteristic analysis of bridge using GNSS data collected in bridge was conducted, through which is to increase the utilization of GNSS for bridge health monitoring system (BHMS).

The purpose of this study is to evaluate the effectiveness of the way-finding system on the facility management in the general hospitals. For this purpose, visiting survey and questionnaire study are carried out for four general hospitals. Based on the results, way-finding system such as sign board is a essential element for patient satisfaction as well as facility management.

As the service period of bridges become increased, more effective maintenance strategy is needed. The decision making strategy should be able to prioritize bridges for maintenance. This study, as preliminary study for the development of prioritization decision making tool, reviews bridge maintenance strategies abroad and domestic.