Waterside structures such as dams or levees are essential for flood protection, and flood induced failures of such structures can cause serious damages. Real-time safety prediction can prevent most of the damages to inland or the consequential economic damages induced by flood hazards. This study introduces a method of real-time safety prediction by evaluating the correlation between numerical simulation, real-time measurement, and geo-centrifuge data.

It is largely divided into two kinds in freezing phenomenon of the tunnel. Waterproof membrane damage inside the tunnel construction joints leaked into groundwater leak occurs in the icicle and despite the absence of damage to the waterproofing membrane, waterproofing membrane from the back of the ground water is frozen freeze by interfering with smooth

Frequent damages and safety incidences had occurred. Although Korea Expressway Coporation is well organized for various disaster and incidences on expressway based on its many experiences, it still have difficulties in demonstrating its superiority and capability in disaster management. Also when compared with disaster management framework of other organization in developed countries, level of the management still need the improvement.

This paper is presented in progressive improvement of the construction and maintenance for corrugated steel plate culverts in Korea expressway. After reviewing the technical consulting reports and field surveying this whole structures. It is effectively help to minimize damage and improve the stability of structures.

Non-destructive test is using rebound hardness and ultrasonography generally. They generate a difference with Core compressive strength in estimation of compressive strength because they are indirectly. Therefor, Inter-rater Reliability analysis was performed to evaluate the reliability of Non-destructive Method. Reliability analysis, while there is correlation two times only between the rebound hardness method and Core compressive strength in total eight cases but ultrasonography method has six times. so ultrasonography method is more reliable than Rebound hardness method.

In reinforced concrete (RC) structures, concrete carbonation depth is an important criterion for the deterioration of durability of RC structures. Concrete carbonation is influenced by multiple factors such as chloride attack, crack, concrete compressive strength, etc. However, due to its complex mechanism, most previous studies considered only one or two deterioration factors to estimate the concrete carbonation depth. In this study, therefore, inspection data were collected from 8 buildings, and the Adaptive Neuro-Fuzzy Inference System (ANFIS) algorithm that estimates the concrete carbonation depth of RC structures has been proposed. The proposed ANFIS model provided good estimations on the carbonation depths.

In This Study, it was intended to performance of the joint grout for offshore wind power substructure. The flow, setting time, compressive strength, flexural strength, tensile strength of basic property and resistance to rapid freezing and thawing, ability to resist chloride ion penetration were carried out as the performance test. Also, on the grout by adding fiber checked flexural toughness, cracking tendency test.

When substation structures are designed, it is important to investigate the design, construction and maintenance plans to enhance the endurance for chloride environment, freezing and electrochemical attack. The research is conducted to investigate intended service life of reinforced concrete substation structures.

Concrete behaves as a brittle material with low tensile strain capacity. By adding fibers, the cracking in concrete matrix is controlled, and the durability is improved. In this study, the microstructure and Chloride diffusion resistance of fiber reinforced concrete are compared with fiber type and fiber volume fraction. From the results, the fiber mixed in concrete must be at least 0.5% regardless fiber type, in order to ensure the chloride diffusion coefficient higher than OPC at 91days. However, the micro structure distribution is affected with fiber volume fraction and fiber type at range 10~100nm.

An accelerometer that has optical fibers to measure the inclination and acceleration of the architectural structures was examined. This was to ensure precise measurement through the unification of the deformation rate sensor and the angular displacement sensor.

Comprehensive evaluation by the old sewage treatment plant residual value, investments are needed, such as adequacy of established objective criteria, such as after maintenance or abolition of sustainable operations. In this study, we propose a comprehensive evaluation items of evaluating structural measures to determine whether the abolition of the old sewage treatment plant.

Using a servo acceleration sensor applied to the inertial navigation system for various weapons system, We developed a sensor which can measure the safety of structure and earthquake. To verify the performance of the sensor, we analyzed the building structure frequency domain, low frequency domain, El-centro sesmic wave for response characteristic. We also tested the sensor whether it can measure angular displacement or not.

This paper presents the experimental results for reinforcement effect for FRP strengthened steel structures. Bond behavior, flexural, and compression were conducted. First, from bond test, it was able to examine the interfacial behavior and to evaluate the interfacial bond stress between AFRP plate and steel plates. Second, for flexural test, maximum load was increased with increasing FRP layer. Also, debonding failure was observed between steel plates and FRP plates. Third, for compression, for short columns it was observed that two sides would typically buckle outward and the other sides would buckle inward. Also, for long columns, overall buckling observed. The maximum load was increased up to 33% for slender section short columns. From the test, it was able to verify the reinforcement effect for FRP strengthened steel structures.

Recently, the interests for the earthquake disaster reduction of stone pagoda structure have been increased. So, the seismic performance evaluation is required according to the construction types and seismic loads. Therefore, this study presents the structure types according to construction circumstances to compare seismic behavior characteristics of stone pagoda structures.

This study compares the steel column-base plate connections to improve the flexural capacity of small building. In addition, performance level was evaluated by example building. Analysis results, an additional reinforcement is required to the proposed steel column-base plate connection. And then, We should compared the impact of beam-column joints.

Tuned Mass Damper (TMD) and viscoelastic damper (VED) is a well-known vibration absorbing equipment in the civil engineering realm. Although the dampers are typically used separately, combined use of dampers worth investigation. For that purpose, a numerical model of multi-story building equipped with TMD and VED was developed using finite element software SAP2000. In this study, modal parameter based distribution of hybrid damper system (HDS) using Tuned Mass Damper (TMD) and viscoelastic damper (VED) together has been adopted to reduce the seismic response of the structure.

Bayesian Approach for efficient collapse response assessment of structure is used in this study. The approach facilitates integration preliminary information of risk assessment with numerical analysis results to get more efficient fragility assessment. We can get the preliminary information from different sources, including professional experience, information on the building design criteria, experimental results and simplified linear dynamic analysis. The combination of prior collapse risk information with nonlinear analysis simulations aims to improve computational and statistical efficiency. In this study, we considered a 62m cantilever and independent intake tower to assess its seismic fragility. The approach provides significant improve the statistical and computational efficiency of seismic fragility as well as precise confidence band of fragility curve compared to alternative method.

Improvement of displacement absorbing performance by utilizing the moving clips in order to prevent falling off of the exterior material according to earthquakes and wind, trying to examine the structural performance of the building exterior panel.

To obtain design parameter of soil protection structure having anchor type foundation, model test is executed for flexible and rigid structures. Empirical equation for soil impact force with variation of slope angle and spacing is suggested in this study.

To improve the shear bonding capacity of deckplate and concrete, we retrofit shape of 150 TU deck and performed fire resistance test. Fire resistance test results show 90 minutes fire resistance capacity for 6kN/m2 live load condition.