Precise Inspection for Safety Diagnosis on 6 dams have been conducted by KISTEC. Spillway is the main structure of dam facilities especially in discharging water. Crack, leakage, and other defects have been inspected and analyzed depending on the purpose of spillway such as water gate or gate of intake.

In this study, experiments were conducted for the maintenance, repair and management. The compressive strength of recycled concrete was estimated by using the ultrasonic pulse velocity for performance evaluation and state evaluation of the structure. In order to improve reliability of the results, the algorithm was implemented by using the artificial neural networks.

The purpose of this study is the implementation platform for quality management of ocher concrete using nondestructive tests. It uses the relationship between the compressive strength and ultrasonic pulse velocity of the ocher concrete to estimate the compressive strength of the ocher concrete. And using the impact echo method to estimate the thickness of the ocher concrete. The platform is based on a Java script, so that the user can obtain the data through the platform.

In this study, the method of estimating impact coefficient is studied by dynamic load test using the results of inspection for railway bridge that have few errors that may occur in case of running of trains because trains move on the railway bridge.

By amending of the special law on the safety management of the facility, coastal structures(breakwaters) has been incorporated into kinds of facilities. In this paper, a case study for condition assessment of coastal structures(breakwaters) is conducted according to the detailed guidelines established for coastal structures(breakwaters).

In this study, discover vulnerable elements of Road Tunnel by database and analyzing inspection reports. And provide the data so that can explore ways to improve and feedback.

This research was studied on seismically strengthened RC columns with Strain Hardening Cementitious Composites(SHCC). The seismic performance of the SHCC-RC composite columns in SDOF system was evaluated by the concepts of seismic performance-based design approaches; the Capacity Spectrum Method(CSM), the Direct Displacement Based Design(DDBM) and the Displacement Coefficient Method(DCM).

Condition evaluation consists of visual inspection and durability assessment. Visual inspection has weakness such as subjectivity of inspector and qualitative evaluation. So, this study is fundamental research for realtime safety evaluation of landing pier based on safety inspection manual. This study is for safety assessment of pile safety and bearing capacity using realtime occurrence strain of pile.

Space took place between two superstructures of which two bridges are adjacent each other. The cause of space between superstructures turn out to be due to several reason such as stratum composition by various ground condition, ground stability after completion of structure, ground stress bulb double, etc.

This study is to determine the predictability of the ground cavitation by GPR (ground penetrating radar) equipment. Hume pipe, PE pipe, Steel Pipe and EPS (expanded polystyrene) are buried in the test bed. According to detection results, the EPS was not well detected. It received a lot of interference signal of other buried things. Otherwise the buried pipes were well detected.

Recently, the problem about a structural safety of the tunnel lining concrete is much raised. Thus, in this paper, We introduce a safety analysis case about an insufficient filling of the road tunnel(NATM) lining concrete for numerical analysis.

Current bridge load carrying capacity evaluation method requires FE model and field test to get the dynamic response. This paper shows a economic and convenient technique to trace the variation of the load carrying capacity of bridges, based on fundamental frequency measured under actual traffic flow.

The light rail transits, in theses days, are planed to be introduced in Korea. However, there are more and more problems regarding the noise and vibration from the trackway. In order to reduced the vibration and noise, various method have been applied. Among those methods, it is that one of the most effective ways is to apply the floating mat underneath the slab track. In this stud, a numerical modeling to calculate the effect of the floating mat is to be used as well as the performance of the floating track.

This is A Study on the Bond Performance of Synthetic Polymer Composite Waterproofing and Anticorrosion Method in accordance with PE Fiber Reinforcement. Test results, A Bond Performance of the Test Specimen was confirmed to have increased 37.5%. By PE Fiber Reinforcement.

Recent development in North Korea has heighted the security situation in Northeast Asia region. Also, the discussion and interest relation to reunification of the government and academia including korean people have been actively developed. Therefore, this study should asserts the needs and plan of infrastructure improvement in the Korean Peninsula. Accordingly, The purpose of this study is as follows; First, it investigate the current status for the civil structures facility including the main infrastructures of North Korea. Second, it estimate on the risk and technology level of Infrastructure Based on questionnaire and interview refugees of North Korea.

Geopolymer has recently emerged as an environmentally sustainable material considered to be an alternative to conventional Portland cement. Current study exhibits and discusses the results of experiment on the alteration in mechanical strength of fly ash-based geopolymer mortar activated by alkaline solution with three different sodium hydroxide solution concentrations (etc 10M, 14M and 18M) after exposure to elevated temperatures ranging from 100oC to 1000oC. Thegeopolymermotarexhibitedits strength increase after exposure at 100oC or 200oC ,followed bythe considerable strength loss in strength between 300oC and 700oC. However, the mortar strength rose slightly after exposure to temperature range from 800oC to 1000oC due to the viscous sintering process.

The purpose of this study was to evaluate the dynamic mechanical properties of fiber reinforced cement composite according to the strain rate. Experiment result, the compressive strength was improved by increase the strain rate. But strain at the peak stress and elastic modulus was not affected by the strain rate.

It is difficult to predict scabbing limit thickness of fiber reinforced concrete, because existing formulas are not consider fiber reinforcing effect. So, In this study, obtaining the fiber reinforced factor and factors are applied to Modified NDRC formula. As results, it was possible to make accurate prediction for scabbing limit thickness of fiber reinforced concrete.

The research was conducted for making accident-free and effective construction site to improve the smart construction site management environment by using new developed technology such as Internet of Things, Smart phones and GPS Tracking. The study recommends new construction accident prevention system using smart phone.

High-strength bolt has high stiffness and fatigue strength. At this time, initial axial force is one of main factor to affect the strength and deformation behavior of connection. Therefore, the objective of this study is to investigate reduction of initial axial force in high-strength bolt under shear fatigue.