Through the analysis of load behavior for two load cases, the fixing equipment developed shows higher limit load than maximum load data sensed in site experiments, which proves that the suggested fixing equipment have higher safety.

Nowadays, wireless sensor network applications have been used in several important areas, such as healthcare, construction, critical infrastructure, environmental monitoring, and manufacturing. However, due to the limitation of WSNs in terms of memory, energy, computation, and scalability, efficient management of the large number of WSNs data in these areas is an important issue to deal with. There is a need for a high-performance computing and massive storage infrastructure for real-time processing and storing of the data as well as analysis of the information. In this paper, we present a technology and application of sensor cloud computing based on IoT and service to manage monitoring sensor data for the f construction design-build projects. With this IoT sensor cloud platform, the entire project participants can efficiently share information to identify and solve issues in the design build phase.

For monitoring of the coastal and offshore structures, many techniques can be applied. In this paper, three different applications were introduced including surface wave based nondestructive testing for concrete structures, vision-based dynamic motion measurement for floating structures, and long-term monitoring using dynamic responses and static strain measurement data for fixed offshore jacket structures.

Assessment of surface cracks is important to ensuring the health of concrete structures. Traditional visual inspection processes are time-consuming and their performance depends heavily on the inspector’s skill and experience. In this paper, digital image processing techniques are employed to monitor the surface cracks in concrete. The automated processing method is proposed for further implementation to an flight drone.

In this study, a powerful new approach to vehicle-bridge interaction observation in operational bridge structures is proposed using University of Michigan’s Narada wireless sensors. Based on the novel data acquisition, dynamic behavior of a bridge under a moving vehicle is experimentally analyzed.

Ground anchor method is one of the most popular reinforcing technology for slope in Korea. For the health monitoring of slope which is reinforced by permanent anchor for a long period, monitoring of the tension force of ground anchor is very important. Optical FBG sensors embedded tendon was developed to measure the strain of 7-wire strand by embedding FBG sensor into the center king cable of 7-wire strand. This FBG sensors embedded tendon has been successfully applied to measure the reinforcing force of ground anchor during four seasons through temperature compensation of the FBG sensors embedded tendon.

Robotics-Assisted Bridge Inpection Tool (RABITTM) combines a capability of conventional non-destructive evaluation techniques for condision assessment of concrete bridge decks, including electrical resistivity (ER), ground-penetrating radar (GPR), Impact-echo (IE), ultrsonic surface waves (USW), and a high resolution digital camera. In this study, the RABITTM platform was used to evaluate delaminaitons in a concrete bridge deck in the laboratory.

Multi-physics nondestructive evaluation(NDE) technologies were proposed for monitoring section-loss and breakage of strands and tendons in prestressed girders moved from an actual bridge. The primary NDE technologies include Magnetic flux(MFL), Electrical resisticity(ER), Half-cell Potential (HCP), and Linear-polarization(LPR).

Based on the study of chloride migration coefficient and hydration heat evolution, it was found that the use of ternary blended cement was effective to achieve desired service life and minimum crack index. On the other hand, a high level of compressive strength is required for marine concrete mix design.

We analyzed the characteristics of damage by the ratio of defect, damage and deterioration, and bridge members based on the last 15 years safety diagnosis of expressway bridges. Accordingly, we confirmed the importance of the maintenance of non-structural members (Pavement of bridge deck, Expansion joint, Shoe, Drainage etc.) on the total service life of bridges.

Usually, we have many difficulties in funding because of the prejudice that the bridge inspection facilities are not a critical part in bridges. Also, high initial cost resulted in the decrease trend in installing the bridge inspection facilities. But, in this research, we reached to the conclusion that installing fixed bridge inspection facilities are most economical and more effective in required time, input man-power and equipments than any other means to approach bridges by analysis considering LCC(Life Cycle Cost).

In this study, We expected a performance for asphalt pavement in bridge decks using survival functions on reliability theory. The sample data were extracted in the Highway Bridge Management System(HBMS). It were 1,132 bridges that were calibrated by a construction report and filtering of inconsistent data. The average life of all the Asphalt Pavement in Bridge Decks was about 12years.

Risk Based Inspection(RBI) Period was proposed for highway bridges in Korea. Hazard factors affecting bridge condition deterioration were found by analyzing condition data from Highway Bridge Management System(HBMS). Certain level of correlations between those factors and condition deterioration were found. They are used to evaluate hazard score. Summarizing several hazard factors, final hazard is classified as three level;high, moderate, low. Vulnerability is assessed only by the current state of bridge. Then, risk matrix is suggested for inspection periods. Inspection periods of the bridges with grade C, D, and E are maintained the same as before. But, those of grade A and B with moderate and high hazard score are elongated to maximum 6 years while the maximum inspection period is three years at present. By adjusting inspection period according to risk assessment, it was shown that 27% of average inspection manpower can be saved.

In the case of using highway bridge abutments on soft ground, the soft ground often causes serious troubles such as lateral movement of bridge abutments by lateral surcharges. Lateral movement of bridge abutments cause damage of expansion joints and bearings, parapet wall cracks, settlement of approach slabs. In this study, the causes and countermeasure of lateral movement of abutments were investigated.

This study suggested an improvement of existing tunnel drainage system to prevent pavement crack, floating, rising due to tunnel seepage water at the time of heavy rains. First, we derive the main cause through case studies of poor drainage, such as pavement damage due to tunnel seepage water at the time of heavy rains, poor drainage in the changing sections of superelevation, and pipe clogging due to calcification. On this basis, we suggested four drainage improvement systems depending on the range of watering and its urgency, as follows: Drain hole drilling and installation of induced ditch, Pipe installation connected to collecting well, Installation of block out on the side of collecting well and filter layer, Installation of holes for maintaining dummy ditch. In conclusion, through such improvements suggested above, we expect that we will be able to effectively prevent pavement damage due to tunnel seepage water. Consequentially, it will also contribute improving the safety of vehicles in the expressway.

Precast concrete deck through factory production of precast products can minimize construction method and the traffic congestion and can be effective alternative to conventional cast-in-place. In particular, in the case of precast deck, connection details between precast decks are very important because durability and load-bearing performance of structures is greatly affected by them. so conneciotion details to secure constructability and safety, affordability are very important. In this study, a new connection detail on the precast deck connections are proposed and test results comparison from various parametric experiments would be performed to verify the applicability of the proposed technique.

Recently, the increased maintenance cost of underground structures due to leakage problems. Also, social issues are discussed in the sink hole caused by the loss of groundwater. For this reason, Leak diagnosis, waterproof and repair of underground structure is important today. So, the aim of this study was the necessity for water leak diagnosis and repair of underground structures.

This study is necessity for waterproofing construction using a Life Cycle Cost(LCC). On the purpose of expanding the technology to build and optimize leakage prevention design reasonable selection of center performance evaluation system and possible economic evaluation system.

This report is contained to the repair guidelines of water-leakage crack and the standardization of performance evaluation testing method studied and reviewed to register to the domestic construction technique as the international standard, and to the introduction to the it’s research contents lasted three years between 2010 and 2013.

With the recent increased awareness of underground water as a resource and detection of radioactive material called radon in underground, underground waterproofing system is newly regard as not only ensuring stability and durability of the structure but also preserving underground water, safety of employee working underground structure, protecting of facilities and comfortable use. For these reasons, constructing industry have highly demanded feasible underground waterproofing system that responding long-life and high-performance new material and developing waterproof performance evaluation techniques. Therefore, this study attempts to build environmental responding waterproof system with high adhesive sealant material and setting a manual of field application in waterproofing construction technique.