A new high-rise building in downtown before Underground excavation work, These steps are conducted such as RMR analysis, Schmidt Hammer Test, and Rock Mass Classification by Breakability, After that rock digging work will begin.

This study proposes a selection method of a performance evaluation index of waterproofing and anti corrosion materials used in domestic water treatment facilities for material and construction failures based on different usage and environmental conditions to study the possibility of structural performance maintenance. Different types of waterproofing･anti-corrosion materials have been evaluated based on their respective properties, and have been classified into separate categories based on their case studies of material failures in construction. As a result, 12 different performance evaluation indexes have been produced for the performance evaluation method. Among the 12 performance evaluation index 5 were selected with relatively low importance that produced a low value of 60% importance using AHP analysis method, and conclusively proposed 7 performance evaluation index criteria (wet surface adhesion, fatigue resistance, crack resistance, adhesion performance, joint performance, impact resistance, impermeability)

The Infrared-Thermography Technique is widely used for nondestructive evaluation (NDE) of structures due to its convenience. Particularly, various techniques have been tried to detect imperfections such as surface defects and welding defects of steel structures. This paper is a part of a study to detect defects in weld zone in steel structures using Infrared Thermography techniques. Finally, defects were detected by comparing infrared thermal image and surface temperature data of defected area with healthy area.

In this study, for investigating the types of damages that can occur on the reinforced earth retaining walls, the results of field survey of reinforced earth retaining walls on the expressway where problems have been reported are summarized. The results of analysis on damage type and cause of reinforced earth retaining wall of highway are presented.

In this study, a case study on the field survey method and repair and reinforcement method of reinforced earth retaining wall damaged by salinity was carried out.

In this study, dynamic characteristics were analyzed by field measurement and experiment mode analysis on a vertical axis wind turbine with resonance issue, and dynamic model modification was also carried out by concrete filling inside the steel tower. Finally, the overall power generation and economic efficiency due to the extension of the range of rotor rotational speed was also analyzed.

Robotics-Assisted Bridge Inpection Tool (RABITTM) combines a capability of conventional non-destructive evaluation techniques for condition assessment of concrete bridge decks, including electrical resistivity (ER), ground-penetrating radar (GPR), impact-echo (IE), ultrasonic 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 fabricated in the laboratory.

The depth of a surface-breaking crack in a concrete slab is characterized by using airborne surface wave transmission measurements. Two air-coupled sensors are used to measure surface waves across surface-breaking cracks with varying depths from 0 mm to 100 mm in a concrete slab (1500 X 1500 X 180 mm3). Resulting transmission coefficient and crack depth relation from a series of experimental studies shows a good agreement with theoretical results previously obtained by the author.

This research aim to investigate the qualitative and quantitative performance of concrete deteriorations using Pulse Square Thermography (PST) technique. An experimental test of ten cases was conducted on a concrete slab specimen under different meteorological conditions. The results showed that the absolute contrast between defective area and sound area decreases with the falling of ambient temperature. Besides, the delamination with identical size but placed at a deeper position indicates lower absolute contrast than the shallow delamination.

The safety issue of PSC box girder bridge stood out. So, we developed material testing method and procedures and applied them to existing bridge. Consequently, We found that the procedure we developed is very reasonable.

In this study, multipoint dynamic vertical displacement of liquid in the tuned liquid damper (TLD) is measured by a laser Doppler vibrometer (LDV) and a Galvanometer scanner to overcome limitations of existing sensors and to leverage noncontact sensing.

According to this research, it was confirmed that safety coefficient is useful tool to rationally quantify structural deterioration of pipe. In addition, it could perform simple and rapid evaluation escaping from confinement by time and budget, and it can be utilized as a tool to set up policy for future water supply.

The freezing-thawing damage of concrete structures is difficult to identify quantitatively in field. Therefore in this study, the correlation between rebound hardness values by Schmidt hammer on concrete surface and relative dynamic modulus of elasticity which is the most quantitative measuring method of damage by freezing-thawing are reviewed. The results showed that those two factors have similar decreasing tendency according to development of freezing-thawing degradation.

In this study, In this study, Simulation using COMSOL Multiphysics thermal flow program of A company was carried out for thermal diffusion analysis according to depth of concrete exposed to high temperature. As a result of the analysis, it was found that the thermal diffusivity decreased with the depth and the temperature difference decreased with the heating time.

In this study, The correlation between drainage clogging of drain tunnel and leakage of lining was analyzed. As a result of analysis, the position of clogged drainage hole, leakage and efflorescence location are similar. When repairing leakage of lining, the maintenance method should be selected considering the clogging of tunnel drainage.

This study proposed a technique to detect the carbonated concrete region in the image of concrete sprayed with phenolphthalein liquid. Test results showed that the carbonation region can be detected accurately using the proposed technique.

The purpose of this study is to develope items for regular and emergent inspections in order to prevent a debris flow in urban areas. Preliminary evaluation items which are matched with urban characteristic were derived by Literature review and first survey of the Delphi technique. It is expected that final items for regular and emergent inspections are developed by additional surveys of the Delphi technique.